Articles about Bitcoin wallets– BitcoinWiki

/r/Bitcoin FAQ - Newcomers please read

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
The following videos are a good starting point for understanding how bitcoin works and a little about its long term potential:
For some more great introductory videos check out Andreas Antonopoulos's YouTube playlists, he is probably the best bitcoin educator out there today. Also have to give mention to James D'Angelo's Bitcoin 101 Blackboard series. Lots of additional video resources can be found at the videos wiki page or /BitcoinTV.
Key properties of bitcoin
Some excellent writing on Bitcoin's value proposition and future can be found here. Bitcoin statistics can be found here, here and here. Developer resources can be found here and here. Peer-reviewed research papers can be found here. The number of times Bitcoin was declared dead by the media can be found here. Scaling resources here, and of course the whitepaper that started it all.

Where can I buy bitcoins?

BuyBitcoinWorldwide.com and Howtobuybitcoin.io are helpful sites for beginners. You can buy or sell any amount of bitcoin and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also, check out the bitcoinity exchange resources for a larger list of options for purchases.
Bank Transfer Credit / Debit card Cash
Coinbase Coinbase LocalBitcoins
Gemini Bitstamp LibertyX
GDAX Bitit Mycelium LocalTrader
Bitstamp Cex.io BitQuick
Kraken CoinMama WallofCoins
Xapo BitcoinOTC
Cex.io
itBit
Bitit
Bitsquare
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Cashila or Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
Android iOs Desktop
Mycelium BreadWallet Electrum
CoPay AirBitz Armory
Another interesting use case for physical storage/transfer is the Opendime. Opendime is a small USB stick that allows you to spend Bitcoin by physically passing it along so it's anonymous and tangible like cash.
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account, usually from a text message or app, making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy
Android Android
iOS iOS

Where can I spend bitcoins?

A more comprehensive list can be found at the Trade FAQ but some more commons ones are below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Steam, HumbleBundle, Games Planet, itch.io, g2g and kinguin For when you need to get your game on
Microsoft Xbox games, phone apps and software
Spendabit, The Bitcoin Shop, Overstock, DuoSearch, The Bitcoin Directory and BazaarBay Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg and Dell For all your electronics needs
Cashila, Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, Pey.de, LivingRoomofSatoshi, Hyphen.to, Coinsfer, GetPaidinBitcoin, Coins.co.th, More #1, #2 Bill payment
Foodler, Menufy, Takeaway, Thuisbezorgd NL, Pizza For Coins Takeout delivered to your door!
Expedia, Cheapair, Lot, Destinia, BTCTrip, Abitsky, SkyTours, Fluege the Travel category on Gyft and 9flats For when you need to get away
BoltVM, BitHost VPS service
Cryptostorm, Mullvad, and PIA VPN services
Namecheap, Porkbun For new domain name registration
Stampnik and GetUSPS Discounted USPS Priority, Express, First-Class mail postage
Reddit Gold Premium membership which can be gifted to others
Coinmap, 99Bitcoins and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations, such as Wikipedia, Red Cross, Amnesty International, United Way, ACLU and the EFF. You can find a longer list here.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. Bitseed is an easy option for getting set up. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
WorkingForBitcoins, Bitwage, XBTfreelancer, Cryptogrind, Bitlancerr, Coinality, Bitgigs, /Jobs4Bitcoins, Rein Project Freelancing
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
Watchmybit, Streamium.io, OTika.tv, XOtika.tv NSFW, /GirlsGoneBitcoin NSFW Video Streaming
Bitasker, BitforTip, WillPayCoin Tasks
Supload.com, SatoshiBox, JoyStream, File Army File/Image Sharing
CoinAd, A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins)

Bitcoin Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network, Amiko Pay, and Strawpay Payment channels for network scaling
Blockstream and Drivechain Sidechains
21, Inc. Open source library for the machine payable web
ShapeShift.io Trade between bitcoins and altcoins easily
Open Transactions, Counterparty, Omni, Open Assets, Symbiont and Chain Financial asset platforms
Hivemind and Augur Prediction markets
Mirror Smart contracts
Mediachain Decentralized media library
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
Samourai and Dark Wallet - abandoned Privacy-enhancing wallets
JoinMarket CoinJoin implementation (Increase privacy and/or Earn interest on bitcoin holdings)
Coinffeine and Bitsquare Decentralized bitcoin exchanges
Keybase and Bitrated Identity & Reputation management
Bitmesh and Telehash Mesh networking
JoyStream BitTorrent client with paid seeding
MORPHiS Decentralized, encrypted internet
Storj and Sia Decentralized file storage
Streamium and Faradam Pay in real time for on-demand services
Abra Global P2P money transmitter network
bitSIM PIN secure hardware token between SIM & Phone
Identifi Decentralized address book w/ ratings system
Coinometrics Institutional-level Bitcoin Data & Research
Blocktrail and BitGo Multisig bitcoin API
Bitcore Open source Bitcoin javascript library
Insight Open source blockchain API
Leet Kill your friends and take their money ;)

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
millibitcoin mBTC 1,000 per bitcoin SI unit for milli i.e. millilitre (mL) or millimetre (mm)
microbitcoin μBTC 1,000,000 per bitcoin SI unit for micro i.e microlitre (μL) or micrometre (μm)
bit bit 1,000,000 per bitcoin Colloquial "slang" term for microbitcoin
satoshi sat 100,000,000 per bitcoin Smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $500 for one Bitcoin, a $10 meal would equal:
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit. A complete list of bitcoin related subreddits can be found here
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
submitted by BinaryResult to Bitcoin [link] [comments]

Obvious case of Blockstream & Bitcoin Core product placement? (article series on privacy & cryptocurrencies)

In a 4-part series, Eric Wall neatly demonstrates how to do product placement for Blockstream, Bitcoin Core and their affiliates including the usual troupe of BS/Core "experts".
Note: "article series by the Human Rights Foundation (HRF) on privacy and cryptocurrency, funded by the Zcash Foundation".
Don't get me wrong, there is plenty good information contained in the articles linked below. But the product placement of Bitcoin Core, Lightning, Liquid and "Green", could hardly be more obvious. For an article series "on privacy and cryptocurrencies", there is a heavy focus on BTC except in a single part (III) where the privacy coins Zcash, Monero, Grin and Beam are examined.
I recommend you read the articles. Below I've pointed out certain items that are mentioned and linked frequently within each article.
Privacy and Cryptocurrency, Part I: How Private is Bitcoin?
Privacy and Cryptocurrency, Part II: Bitcoin Wallets
  • website: bitcoin.org (get started)
  • wallet: Bitcoin Core
  • wallet: Wasabi
  • wallet: Armory
  • wallet: mSigna
  • wallet: Bitcoin Knots
  • wallet: Electrum
  • person: Peter Todd
  • person: Jameson Lopp
  • person: Udi Wertheimer
  • person: Hampus Sjöberg
  • hardware wallet: Trezor
  • hardware wallet: Ledger
  • payment server: BTCPay Server
  • payment code service: PayNym.is (made by Samourai)
  • 2nd layer: Lightning Network
  • sidechain: Liquid (by Blockstream)
  • wallet: Blockstream Green (linked via blockstream site)
  • wallet: Samourai (linked via it's own site)
  • wallet: BRD (linked via bitcoin.org!)
  • wallet: Schildbach (linked via bitcoin.org!)
  • mailing list: bitcoin-dev (run by Bitcoin Core people)
Privacy and Cryptocurrency, Part III: Should You Use a Privacy Coin?
  • Lightning
  • Liquid
  • coin: Monero
  • coin: Zcash
  • coin: Grin
  • coin: Beam
  • person: Daniel Lehnberg (Grin)
  • person: Andrew Poelstra (Blockstream, MimbleWimble)
  • person: Guy Corem.(Beam)
  • person: Ian Miers (Zcash)
  • person: Francisco Cabañas (Monero)
Privacy and Cryptocurrency, Part IV: Stablecoins— Blacklists and Traceability
  • coin: USDT on Liquid
  • wallet: Blockstream Green
  • Lightning Network (for future support of Liquid tokens like USDT)
  • person: Jameson Lopp
  • person: Matt Odell
As we can see, every article prominently highlights of Blockstream or Bitcoin Core affiliated products, persons or related companies. And every article studiously omits any mention of Bitcoin Cash or any of the privacy technologies built on it (CashShuffle) or in development on it (CashFusion), or the stable coin USDH operating on top of Bitcoin Cash.
There are certainly other cryptocurrencies and projects on them which offer privacy features, but are left unexamined in this series (e.g. projects offering privacy on ETH, mixing in Dash, etc)
In conclusion the intentions ascribed to the HRF in the first article.
The intention of the Human Rights Foundation is to examine these technologies and elucidate on their potential of bringing economic and political freedom to the individual. While there are many angles in the context of money that are within the scope of such an endeavor, we’ve chosen to focus on the topic of privacy foremost. In that pursuit it’s also clear that the degree to which cryptocurrencies enable privacy is not by any means trivial or binary — it varies greatly depending on the user’s particular choice of core and ancillary technologies and usage patterns, as well as the capabilities and sophistication of the attacker.
submitted by DarthBacktrack to btc [link] [comments]

/r/Bitcoin FAQ - Newcomers please read

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
The following videos are a good starting point for understanding how bitcoin works and a little about its long term potential:
For lots of additional video resources check out the videos wiki page or /BitcoinTV.
Key properties of bitcoin
Some excellent writing on Bitcoin's value proposition and future can be found here. Bitcoin statistics can be found here and here. Developer resources can be found here and here. Peer-reviewed research papers can be found here. The number of times Bitcoin was declared dead by the media can be found here. Scaling resources here, and of course the whitepaper that started it all.

Where can I buy bitcoins?

BuyBitcoinWorldwide.com is a very helpful site for beginners. You can buy or sell any amount of bitcoin and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also, check out the bitcoinity exchange resources for a larger list of options for purchases.
Bank Transfer Credit / Debit card Cash
Coinbase Coinbase LocalBitcoins
Gemini Bitstamp LibertyX
GDAX Bitit Mycelium LocalTrader
Bitstamp Cex.io BitQuick
Kraken CoinMama WallofCoins
Xapo BitcoinOTC
Cex.io
itBit
Bitit
Bitsquare
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Cashila or Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
Android iOs Desktop
Mycelium BreadWallet Electrum
CoPay AirBitz Armory
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account, usually from a text message or app, making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy
Android Android
iOS iOS

Where can I spend bitcoins?

A more comprehensive list can be found at the Trade FAQ but some more commons ones are below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Steam, HumbleBundle, GreenmanGaming, and Coinplay.io For when you need to get your game on
Microsoft Xbox games, phone apps and software
Spendabit, The Bitcoin Shop, Overstock, Rakuten, DuoSearch, The Bitcoin Directory and BazaarBay Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg, TigerDirect and Dell For all your electronics needs
Cashila, Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, Pey.de, LivingRoomofSatoshi, Hyphen.to, Coinsfer, GetPaidinBitcoin, Coins.co.th, More #1, #2 Bill payment
Foodler, Takeaway, Thuisbezorgd NL, Pizza For Coins Takeout delivered to your door!
Expedia, Cheapair, Lot, Destinia, BTCTrip, Abitsky, SkyTours, Fluege the Travel category on Gyft and 9flats For when you need to get away
BoltVM, BitHost VPS service
Cryptostorm, Mullvad, and PIA VPN services
Namecheap For new domain name registration
Stampnik and GetUSPS Discounted USPS Priority, Express, First-Class mail postage
Reddit Gold Premium membership which can be gifted to others
Coinmap, 99Bitcoins and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations, such as Wikipedia, Red Cross, Amnesty International, United Way, ACLU and the EFF. You can find a longer list here.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. Bitseed is an easy option for getting set up. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
Bitwage, XBTfreelancer, Cryptogrind, Bitlancerr, Coinality, Bitgigs, /Jobs4Bitcoins, Rein Project Freelancing
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
Watchmybit, Streamium.io, OTika.tv, XOtika.tv NSFW, /GirlsGoneBitcoin NSFW Video Streaming
Bitasker, BitforTip, WillPayCoin Tasks
Supload.com, SatoshiBox, JoyStream, File Army File/Image Sharing
CoinAd, A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins)

Bitcoin Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network, Amiko Pay, and Strawpay Payment channels for network scaling
Blockstream and Drivechain Sidechains
21, Inc. Open source library for the machine payable web
ShapeShift.io Trade between bitcoins and altcoins easily
Open Transactions, Counterparty, Omni, Open Assets, Symbiont and Chain Financial asset platforms
Hivemind and Augur Prediction markets
Mirror Smart contracts
Mediachain Decentralized media library
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
Samourai and Dark Wallet - abandoned Privacy-enhancing wallets
JoinMarket CoinJoin implementation (Increase privacy and/or Earn interest on bitcoin holdings)
Coinffeine and Bitsquare Decentralized bitcoin exchanges
Keybase and Bitrated Identity & Reputation management
Bitmesh and Telehash Mesh networking
JoyStream BitTorrent client with paid seeding
MORPHiS Decentralized, encrypted internet
Storj and Sia Decentralized file storage
Streamium and Faradam Pay in real time for on-demand services
Abra Global P2P money transmitter network
bitSIM PIN secure hardware token between SIM & Phone
Identifi Decentralized address book w/ ratings system
Coinometrics Institutional-level Bitcoin Data & Research
Blocktrail and BitGo Multisig bitcoin API
Bitcore Open source Bitcoin javascript library
Insight Open source blockchain API
Leet Kill your friends and take their money ;)

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
millibitcoin mBTC 1,000 per bitcoin SI unit for milli i.e. millilitre (mL) or millimetre (mm)
microbitcoin μBTC 1,000,000 per bitcoin SI unit for micro i.e microlitre (μL) or micrometre (μm)
bit bit 1,000,000 per bitcoin Colloquial "slang" term for microbitcoin
satoshi sat 100,000,000 per bitcoin Smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $500 for one Bitcoin, a $10 meal would equal:
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit. A complete list of bitcoin related subreddits can be found here
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
submitted by BinaryResult to Bitcoin [link] [comments]

The Great Bitcoin Bull Market Of 2017 by Trace Mayer

By: Trace Mayer, host of The Bitcoin Knowledge Podcast.
Originally posted here with images and Youtube videos.
I just got back from a two week vacation without Internet as I was scouring some archeological ruins. I hardly thought about Bitcoin at all because there were so many other interesting things and it would be there when I got back.
Jimmy Song suggested I do an article on the current state of Bitcoin. A great suggestion but he is really smart (he worked on Armory after all!) so I better be thorough and accurate!
Therefore, this article will be pretty lengthy and meticulous.
BACKGROUND
As I completely expected, the 2X movement from the New York Agreement that was supposed to happen during the middle of my vacation flopped on its face because Jeff Garzik was driving the clown car with passengers willfully inside like Coinbase, Blockchain.info, Bitgo and Xapo and there were here massive bugS and in the code and miners like Bitmain did not want to allocate $150-350m to get it over the difficulty adjustments.
I am very disappointed in their lack of integrity with putting their money where their mouths are; myself and many others wanted to sell a lot of B2X for BTC!
On 7 December 2015, with Bitcoin trading at US$388.40, I wrote The Rise of the Fourth Great Bitcoin Bubble. On 4 December 2016, with Bitcoin trading at US$762.97, I did this interview:

As of 26 November 2017, Bitcoin is trading around US$9,250.00. That is an increase of about 2,400% since I wrote the article prognosticating this fourth great Bitcoin bull market. I sure like being right, like usual (19 Dec 2011, 1 Jul 2013), especially when there are financial and economic consequences.
With such massive gains in such a short period of time the speculative question becomes: Buy, Hold or Sell?
FUNDAMENTALS
Bitcoin is the decentralized censorship-resistant Internet Protocol for transferring value over a communications channel.
The Bitcoin network can use traditional Internet infrastructure. However, it is even more resilient because it has custom infrastructure including, thanks to Bitcoin Core developer Matt Corrallo, the FIBRE network and, thanks to Blockstream, satellites which reduce the cost of running a full-node anywhere in the world to essentially nothing in terms of money or privacy. Transactions can be cheaply broadcast via SMS messages.
SECURITY
The Bitcoin network has a difficulty of 1,347,001,430,559 which suggests about 9,642,211 TH/s of custom ASIC hardware deployed.
At a retail price of approximately US$105/THs that implies about $650m of custom ASIC hardware deployed (35% discount applied).
This custom hardware consumes approximately 30 TWh per year. That could power about 2.8m US households or the entire country of Morocco which has a population of 33.85m.
This Bitcoin mining generates approximately 12.5 bitcoins every 10 minutes or approximately 1,800 per day worth approximately US$16,650,000.
Bitcoin currently has a market capitalization greater than $150B which puts it solidly in the top-30 of M1 money stock countries and a 200 day moving average of about $65B which is increasing about $500m per day.
Average daily volumes for Bitcoin is around US$5B. That means multi-million dollar positions can be moved into and out of very easily with minimal slippage.
When my friend Andreas Antonopolous was unable to give his talk at a CRYPSA event I was invited to fill in and delivered this presentation, impromptu, on the Seven Network Effects of Bitcoin.
These seven network effects of Bitcoin are (1) Speculation, (2) Merchants, (3) Consumers, (4) Security [miners], (5) Developers, (6) Financialization and (7) Settlement Currency are all taking root at the same time and in an incredibly intertwined way.
With only the first network effect starting to take significant root; Bitcoin is no longer a little experiment of magic Internet money anymore. Bitcoin is monster growing at a tremendous rate!!

SPECULATION
For the Bitcoin price to remain at $9,250 it requires approximately US$16,650,000 per day of capital inflow from new hodlers.
Bitcoin is both a Giffen good and a Veblen good.
A Giffen good is a product that people consume more of as the price rises and vice versa — seemingly in violation of basic laws of demand in microeconomics such as with substitute goods and the income effect.
Veblen goods are types of luxury goods for which the quantity demanded increases as the price increases in an apparent contradiction of the law of demand.
There are approximately 16.5m bitcoins of which ~4m are lost, ~4-6m are in deep cold storage, ~4m are in cold storage and ~2-4m are salable.
(http://www.runtogold.com/images/lost-bitcoins-1.jpg)
(http://www.runtogold.com/images/lost-bitcoins-2.jpg)
And forks like BCash (BCH) should not be scary but instead be looked upon as an opportunity to take more territory on the Bitcoin blockchain by trading the forks for real bitcoins which dries up more salable supply by moving it, likely, into deep cold storage.
According to Wikipedia, there are approximately 15.4m millionaires in the United States and about 12m HNWIs ($30m+ net worth) in the world. In other words, if every HNWI in the world wanted to own an entire bitcoin as a 'risk-free asset' that cannot be confiscated, seized or have the balance other wise altered then they could not.
For wise portfolio management, these HNWIs should have at least about 2-5% in gold and 0.5-1% in bitcoin.
Why? Perhaps some of the 60+ Saudis with 1,700 frozen bank accounts and about $800B of assets being targetted might be able to explain it to you.
In other words, everyone loves to chase the rabbit and once they catch it then know that it will not get away.
RETAIL
There are approximately 150+ significant Bitcoin exchanges worldwide. Kraken, according to the CEO, was adding about 6,000 new funded accounts per day in July 2017.
Supposedly, Coinbase is currently adding about 75,000 new accounts per day. Based on some trade secret analytics I have access to; I would estimate Coinbase is adding approximately 17,500 new accounts per day that purchase at least US$100 of Bitcoin.
If we assume Coinbase accounts for 8% of new global Bitcoin users who purchase at least $100 of bitcoins (just pulled out of thin error and likely very conservative as the actual number is perhaps around 2%) then that is approximately $21,875,000 of new capital coming into Bitcoin every single day just from retail demand from 218,750 total new accounts.
What I have found is that most new users start off buying US$100-500 and then after 3-4 months months they ramp up their capital allocation to $5,000+ if they have the funds available.
After all, it takes some time and practical experience to learn how to safely secure one's private keys.
To do so, I highly recommend Bitcoin Core (network consensus and full validation of the blockchain), Armory (private key management), Glacier Protocol (operational procedures) and a Puri.sm laptop (secure non-specialized hardware).
WALL STREET
There has been no solution for large financial fiduciaries to invest in Bitcoin. This changed November 2017.
LedgerX, whose CEO I interviewed 23 March 2013, began trading as a CFTC regulated Swap Execution Facility and Derivatives Clearing Organization.
The CME Group announced they will begin trading in Q4 2017 Bitcoin futures.
The CBOE announced they will begin trading Bitcoin futures soon.
By analogy, these institutional products are like connecting a major metropolis's water system (US$90.4T and US$2 quadrillion) via a nanoscopic shunt to a tiny blueberry ($150B) that is infinitely expandable.
This price discovery could be the most wild thing anyone has ever experienced in financial markets.
THE GREAT CREDIT CONTRACTION
The same week Bitcoin was released I published my book The Great Credit Contraction and asserted it had now begun and capital would burrow down the liquidity pyramid into safer and more liquid assets.
(http://www.runtogold.com/images/Great-Credit-Contraction-Liquidity-Pyramid.jpg)
Thus, the critical question becomes: Is Bitcoin a possible solution to the Great Credit Contraction by becoming the safest and most liquid asset?
BITCOIN'S RISK PROFILE
At all times and in all circumstances gold remains money but, of course, there is always exchange rate risk due to price ratios constantly fluctuating. If the metal is held with a third-party in allocated-allocated storage (safest possible) then there is performance risk (Morgan Stanley gold storage lawsuit).
But, if properly held then, there should be no counter-party risk which requires the financial ability of a third-party to perform like with a bank account deposit. And, since gold exists at a single point in space and time therefore it is subject to confiscation or seizure risk.
Bitcoin is a completely new asset type. As such, the storage container is nearly empty with only $150B.
And every Bitcoin transaction effectively melts down every BTC and recasts it; thus ensuring with 100% accuracy the quantity and quality of the bitcoins. If the transaction is not on the blockchain then it did not happen. This is the strictest regulation possible; by math and cryptography!
This new immutable asset, if properly secured, is subject only to exchange rate risk. There does exist the possibility that a software bug may exist that could shut down the network, like what has happened with Ethereum, but the probability is almost nil and getting lower everyday it does not happen.
Thus, Bitcoin arguably has a lower risk profile than even gold and is the only blockchain to achieve security, scalability and liquidity.
To remain decentralized, censorship-resistant and immutable requires scalability so as many users as possible can run full-nodes.
(http://www.runtogold.com/images/ethereum-bitcoin-scability-nov-2017.png)
TRANSACTIONS
Some people, probably mostly those shilling alt-coins, think Bitcoin has a scalability problem that is so serious it requires a crude hard fork to solve.
On the other side of the debate, the Internet protocol and blockchain geniuses assert the scalability issues can, like other Internet Protocols have done, be solved in different layers which are now possible because of Segregated Witness which was activated in August 2017.
Whose code do you want to run: the JV benchwarmers or the championship Chicago Bulls?
As transaction fees rise, certain use cases of the Bitcoin blockchain are priced out of the market. And as the fees fall then they are economical again.
Additionally, as transaction fees rise, certain UTXOs are no longer economically usable thus destroying part of the money supply until fees decline and UTXOs become economical to move.
There are approximately 275,000-350,000 transactions per day with transaction fees currently about $2m/day and the 200 DMA is around $1.08m/day.
(http://www.runtogold.com/images/bitcoin-transaction-fees-nov-2017.png)
What I like about transaction fees is that they somewhat reveal the financial health of the network.
The security of the Bitcoin network results from the miners creating solutions to proof of work problems in the Bitcoin protocol and being rewarded from the (1) coinbase reward which is a form of inflation and (2) transaction fees which is a form of usage fee.
The higher the transaction fees then the greater implied value the Bitcoin network provides because users are willing to pay more for it.
I am highly skeptical of blockchains which have very low transaction fees. By Internet bubble analogy, Pets.com may have millions of page views but I am more interested in EBITDA.
DEVELOPERS
Bitcoin and blockchain programming is not an easy skill to acquire and master. Most developers who have the skill are also financially independent now and can work on whatever they want.
The best of the best work through the Bitcoin Core process. After all, if you are a world class mountain climber then you do not hang out in the MacDonalds play pen but instead climb Mount Everest because that is where the challenge is.
However, there are many talented developers who work in other areas besides the protocol. Wallet maintainers, exchange operators, payment processors, etc. all need competent developers to help build their businesses.
Consequently, there is a huge shortage of competent developers. This is probably the largest single scalability constraint for the ecosystem.
Nevertheless, the Bitcoin ecosystem is healthier than ever before.
(http://www.runtogold.com/images/bitcoin-ecosystem.jpg)(/images/bitcoin-ecosystem-small.jpg)
SETTLEMENT CURRENCY
There are no significant global reserve settlement currency use cases for Bitcoin yet.
Perhaps the closest is Blockstream's Strong Federations via Liquid.
PRICE
There is a tremendous amount of disagreement in the marketplace about the value proposition of Bitcoin. Price discovery for this asset will be intense and likely take many cycles of which this is the fourth.
Since the supply is known the exchange rate of Bitcoins is composed of (1) transactional demand and (2) speculative demand.
Interestingly, the price elasticity of demand for the transactional demand component is irrelevant to the price. This makes for very interesting dynamics!
(http://www.runtogold.com/images/bitcoin-speculation.jpg)
On 4 May 2017, Lightspeed Venture Partners partner Jeremy Liew who was among the early Facebook investors and the first Snapchat investor laid out their case for bitcoin exploding to $500,000 by 2030.
On 2 November 2017, Goldman Sachs CEO Lloyd Blankfein (https://www.bloomberg.com/news/articles/2017-11-02/blankfein-says-don-t-dismiss-bitcoin-while-still-pondering-value)said, "Now we have paper that is just backed by fiat...Maybe in the new world, something gets backed by consensus."
On 12 Sep 2017, JP Morgan CEO called Bitcoin a 'fraud' but conceded that "(http://fortune.com/2017/09/12/jamie-dimon-bitcoin-cryptocurrency-fraud-buy/)Bitcoin could reach $100,000".
Thus, it is no surprise that the Bitcoin chart looks like a ferret on meth when there are such widely varying opinions on its value proposition.
I have been around this space for a long time. In my opinion, those who scoffed at the thought of $1 BTC, $10 BTC (Professor Bitcorn!), $100 BTC, $1,000 BTC are scoffing at $10,000 BTC and will scoff at $100,000 BTC, $1,000,000 BTC and even $10,000,000 BTC.
Interestingly, the people who understand it the best seem to think its financial dominance is destiny.
Meanwhile, those who understand it the least make emotionally charged, intellectually incoherent bearish arguments. A tremendous example of worldwide cognitive dissonance with regards to sound money, technology and the role or power of the State.
Consequently, I like looking at the 200 day moving average to filter out the daily noise and see the long-term trend.
(http://www.runtogold.com/images/bitcoin-price-200dma-nov-2017.png)
Well, that chart of the long-term trend is pretty obvious and hard to dispute. Bitcoin is in a massive secular bull market.
The 200 day moving average is around $4,001 and rising about $30 per day.
So, what do some proforma situations look like where Bitcoin may be undervalued, average valued and overvalued? No, these are not prognostications.
(http://www.runtogold.com/images/bitcoin-price-pro-forma.png)
Maybe Jamie Dimon is not so off his rocker after all with a $100,000 price prediction.
We are in a very unique period of human history where the collective globe is rethinking what money is and Bitcoin is in the ring battling for complete domination. Is or will it be fit for purpose?
As I have said many times before, if Bitcoin is fit for this purpose then this is the largest wealth transfer in the history of the world.
CONCLUSION
Well, this has been a brief analysis of where I think Bitcoin is at the end of November 2017.
The seven network effects are taking root extremely fast and exponentially reinforcing each other. The technological dominance of Bitcoin is unrivaled.
The world is rethinking what money is. Even CEOs of the largest banks and partners of the largest VC funds are honing in on Bitcoin's beacon.
While no one has a crystal ball; when I look in mine I see Bitcoin's future being very bright.
Currently, almost everyone who has bought Bitcoin and hodled is sitting on unrealized gains as measured in fiat currency. That is, after all, what uncharted territory with daily all-time highs do!
But perhaps there is a larger lesson to be learned here.
Riches are getting increasingly slippery because no one has a reliable defined tool to measure them with. Times like these require incredible amounts of humility and intelligence guided by macro instincts.
Perhaps everyone should start keeping books in three numéraires: USD, gold and Bitcoin.
Both gold and Bitcoin have never been worth nothing. But USD is a fiat currency and there are thousands of those in the fiat currency graveyard. How low can the world reserve currency go?
After all, what is the risk-free asset? And, whatever it is, in The Great Credit Contraction you want it!
What do you think? Disagree with some of my arguments or assertions? Please, eviscerate them on Twitter or in the comments!
submitted by bitcoinknowledge to Bitcoin [link] [comments]

/r/Bitcoin FAQ - Newcomers please read

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
The following videos are a good starting point for understanding how bitcoin works and a little about its long term potential:
For lots of additional video resources check out the videos wiki page or /BitcoinTV.
Key properties of bitcoin
Some excellent writing on Bitcoin's value proposition and future can be found here. Bitcoin statistics can be found here and here. Developer resources can be found here and here. Peer-reviewed research papers can be found here. Scaling resources here, and of course the whitepaper that started it all.

Where can I buy bitcoins?

BuyBitcoinWorldwide.com is a very helpful site for beginners. You can buy or sell any amount of bitcoin and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also, check out the bitcoinity exchange resources for a larger list of options for purchases.
Bank Transfer / Credit card Cash
Coinbase LocalBitcoins
Gemini LibertyX
GDAX Mycelium LocalTrader
Poloniex BitQuick
Bitstamp WallofCoins
Kraken BitcoinOTC
Xapo
SnapCard
Cex.io
itBit
Bitit
Bitsquare
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Cashila or Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
Android iOs Desktop
Mycelium BreadWallet Electrum
CoPay AirBitz Armory
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account, usually from a text message or app, making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy
Android Android
iOS iOS

Where can I spend bitcoins?

A more comprehensive list can be found at the Trade FAQ but some more commons ones are below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Steam, HumbleBundle, GreenmanGaming, and Coinplay.io For when you need to get your game on
Microsoft Xbox games, phone apps and software
Spendabit, The Bitcoin Shop, Overstock, Rakuten, DuoSearch, The Bitcoin Directory and BazaarBay Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg, TigerDirect and Dell For all your electronics needs
Cashila, Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, Pey.de, LivingRoomofSatoshi, Wagepoint, Hyphen.to, Coinsfer, GetPaidinBitcoin, Coins.co.th, More Bill payment
Foodler, Takeaway, Thuisbezorgd NL, Pizza For Coins Takeout delivered to your door!
Expedia, Cheapair, Lot, Destinia, BTCTrip, Abitsky, SkyTours, Fluege the Travel category on Gyft and 9flats For when you need to get away
BoltVM, BitHost VPS service
Cryptostorm, Mullvad, and PIA VPN services
Namecheap For new domain name registration
Stampnik and GetUSPS Discounted USPS Priority, Express, First-Class mail postage
Reddit Gold Premium membership which can be gifted to others
Coinmap and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations, such as Wikipedia, Red Cross, Amnesty International, United Way, ACLU and the EFF. You can find a longer list here.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
Bitwage, XBTfreelancer, Cryptogrind, Bitlancerr, Coinality, Bitgigs, /Jobs4Bitcoins, Rein Project Freelancing
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
Watchmybit, Streamium.io, OTika.tv, XOtika.tv NSFW, /GirlsGoneBitcoin NSFW Video Streaming
Bitasker, BitforTip, WillPayCoin Tasks
Supload.com, SatoshiBox, JoyStream, File Army File/Image Sharing
CoinAd, A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins)

Bitcoin Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network, Amiko Pay, and Strawpay Payment channels for network scaling
Blockstream and Drivechain Sidechains
21, Inc. Open source library for the machine payable web
ShapeShift.io Trade between bitcoins and altcoins easily
Open Transactions, Counterparty, Omni, Open Assets, Symbiont and Chain Financial asset platforms
Hivemind and Augur Prediction markets
Mirror Smart contracts
Mediachain Decentralized media library
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
Samourai and Dark Wallet - abandoned Privacy-enhancing wallets
JoinMarket CoinJoin implementation (Increase privacy and/or Earn interest on bitcoin holdings)
Coinffeine and Bitsquare Decentralized bitcoin exchanges
Keybase and Bitrated Identity & Reputation management
Bitmesh and Telehash Mesh networking
JoyStream BitTorrent client with paid seeding
MORPHiS Decentralized, encrypted internet
Storj and Sia Decentralized file storage
Streamium and Faradam Pay in real time for on-demand services
Abra Global P2P money transmitter network
bitSIM PIN secure hardware token between SIM & Phone
Identifi Decentralized address book w/ ratings system
Coinometrics Institutional-level Bitcoin Data & Research
Blocktrail and BitGo Multisig bitcoin API
Bitcore Open source Bitcoin javascript library
Insight Open source blockchain API
Leet Kill your friends and take their money ;)

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
millibitcoin mBTC 1,000 per bitcoin SI unit for milli i.e. millilitre (mL) or millimetre (mm)
microbitcoin μBTC 1,000,000 per bitcoin SI unit for micro i.e microlitre (μL) or micrometre (μm)
bit bit 1,000,000 per bitcoin Colloquial "slang" term for microbitcoin
satoshi sat 100,000,000 per bitcoin Smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $500 for one Bitcoin, a $10 meal would equal:
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit. A complete list of bitcoin related subreddits can be found here
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
submitted by BinaryResult to Bitcoin [link] [comments]

[uncensored-r/Bitcoin] /r/Bitcoin FAQ - Newcomers please read

The following post by BinaryResult is being replicated because some comments within the post(but not the post itself) have been silently removed.
The original post can be found(in censored form) at this link:
reddit: /Bitcoin/comments/6jlop4
The original post's content was as follows:

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
The following videos are a good starting point for understanding how bitcoin works and a little about its long term potential:
For lots of additional video resources check out the videos wiki page or /BitcoinTV.
Key properties of bitcoin
  • Limited Supply - There will only ever be 21,000,000 bitcoins created and they are issued in a predictable fashion, you can view the inflation schedule here. Once they are all issued Bitcoin will be truly deflationary.
  • Open source - Bitcoin code is fully auditable. You can read the source code yourself here.
  • Accountable - The public ledger is transparent, all transactions are seen by everyone.
  • Decentralized - Bitcoin is globally distributed across thousands of nodes with no single point of failure and as such can't be shut down similar to how Bittorrent works.
  • Censorship resistant - No one can prevent you from interacting with the bitcoin network and no one can censor, alter or block transactions that they disagree with, see Operation Chokepoint.
  • Push system - There are no chargebacks in bitcoin because only the person who owns the address where the bitcoins reside has the authority to move them.
  • Low fee - Transactions fees can vary between a few cents and a few dollars depending on network demand and how much priority you wish to assign to the transaction. Most wallets calculate the fee automatically but you can view current fees here.
  • Borderless - No country can stop it from going in/out, even in areas currently unserved by traditional banking as the ledger is globally distributed.
  • Trustless - Bitcoin solved the Byzantine's Generals Problem which means nobody needs to trust anybody for it to work.
  • Pseudonymous - No need to expose personal information when purchasing with cash or transacting.
  • Secure - Encrypted cryptographically and can’t be brute forced or confiscated with proper key management such as hardware wallets.
  • Programmable - Individual units of bitcoin can be programmed to transfer based on certain criteria being met
  • Nearly instant - From a few seconds to a few minutes depending on need for confirmations. After a few confirmations transactions are irreversible.
  • Peer-to-peer - No intermediaries with a cut, no need for trusted third parties.
  • Portable - Bitcoins are digital so they are easier to move than cash or gold. They can even be transported by simply remembering a string of words for wallet recovery.
  • Scalable - Each bitcoin is divisible down to 8 decimals allowing it to grow in value while still accommodating micro-transactions.
  • Designed Money - Bitcoin was created to fit all the fundamental properties of money better than gold or fiat
Some excellent writing on Bitcoin's value proposition and future can be found here. Bitcoin statistics can be found here, here and here. Developer resources can be found here and here. Peer-reviewed research papers can be found here. The number of times Bitcoin was declared dead by the media can be found here. Scaling resources here, and of course the whitepaper that started it all.

Where can I buy bitcoins?

BuyBitcoinWorldwide.com and Howtobuybitcoin.io are helpful sites for beginners. You can buy or sell any amount of bitcoin and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also, check out the bitcoinity exchange resources for a larger list of options for purchases.
Bank Transfer Credit / Debit card Cash
Coinbase Coinbase LocalBitcoins
Gemini Bitstamp LibertyX
GDAX Bitit Mycelium LocalTrader
Bitstamp Cex.io BitQuick
Kraken CoinMama WallofCoins
Xapo BitcoinOTC
Cex.io
itBit
Bitit
Bitsquare
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Cashila or Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
  • If you prefer to "Be your own bank" and have direct control over your coins without having to use a trusted third party, there are many software wallet options here. If you want easy and secure storage without having to learn computer security best practices, then a hardware wallet such as the Trezor or Ledger is recommended. A more advanced option is to secure them yourself using paper wallets generated offline. Some popular mobile and desktop options are listed below and most are cross platform.
Android iOs Desktop
Mycelium BreadWallet Electrum
CoPay AirBitz Armory
  • If you prefer to let third party "Bitcoin banks" manage your coins, try Coinbase or Xapo but be aware you may not be in control of your private keys in which case you would have to ask permission to access your funds and be exposed to third party risk.
Another interesting use case for physical storage/transfer is the Opendime. Opendime is a small USB stick that allows you to spend Bitcoin by physically passing it along so it's anonymous and tangible like cash.
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account, usually from a text message or app, making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy
Android Android
iOS iOS

Where can I spend bitcoins?

A more comprehensive list can be found at the Trade FAQ but some more commons ones are below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Steam, HumbleBundle, Games Planet, itch.io, g2g and kinguin For when you need to get your game on
Microsoft Xbox games, phone apps and software
Spendabit, The Bitcoin Shop, Overstock, Rakuten, DuoSearch, The Bitcoin Directory and BazaarBay Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg, TigerDirect and Dell For all your electronics needs
Cashila, Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, Pey.de, LivingRoomofSatoshi, Hyphen.to, Coinsfer, GetPaidinBitcoin, Coins.co.th, More #1, #2 Bill payment
Foodler, Menufy, Takeaway, Thuisbezorgd NL, Pizza For Coins Takeout delivered to your door!
Expedia, Cheapair, Lot, Destinia, BTCTrip, Abitsky, SkyTours, Fluege the Travel category on Gyft and 9flats For when you need to get away
BoltVM, BitHost VPS service
Cryptostorm, Mullvad, and PIA VPN services
Namecheap For new domain name registration
Stampnik and GetUSPS Discounted USPS Priority, Express, First-Class mail postage
Reddit Gold Premium membership which can be gifted to others
Coinmap, 99Bitcoins and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations, such as Wikipedia, Red Cross, Amnesty International, United Way, ACLU and the EFF. You can find a longer list here.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
  • 1-3% savings over credit cards or PayPal.
  • No chargebacks (final settlement in 10 minutes as opposed to 3+ months).
  • Accept business from a global customer base.
  • Increased privacy.
  • Convert 100% of the sale to the currency of your choice for deposit to your account, or choose to keep a percentage of the sale in bitcoin if you wish to begin accumulating it.
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. Bitseed is an easy option for getting set up. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
WorkingForBitcoins, Bitwage, XBTfreelancer, Cryptogrind, Bitlancerr, Coinality, Bitgigs, /Jobs4Bitcoins, Rein Project Freelancing
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
Watchmybit, Streamium.io, OTika.tv, XOtika.tv NSFW, /GirlsGoneBitcoin NSFW Video Streaming
Bitasker, BitforTip, WillPayCoin Tasks
Supload.com, SatoshiBox, JoyStream, File Army File/Image Sharing
CoinAd, A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins)

Bitcoin Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network, Amiko Pay, and Strawpay Payment channels for network scaling
Blockstream and Drivechain Sidechains
21, Inc. Open source library for the machine payable web
ShapeShift.io Trade between bitcoins and altcoins easily
Open Transactions, Counterparty, Omni, Open Assets, Symbiont and Chain Financial asset platforms
Hivemind and Augur Prediction markets
Mirror Smart contracts
Mediachain Decentralized media library
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
Samourai and Dark Wallet - abandoned Privacy-enhancing wallets
JoinMarket CoinJoin implementation (Increase privacy and/or Earn interest on bitcoin holdings)
Coinffeine and Bitsquare Decentralized bitcoin exchanges
Keybase and Bitrated Identity & Reputation management
Bitmesh and Telehash Mesh networking
JoyStream BitTorrent client with paid seeding
MORPHiS Decentralized, encrypted internet
Storj and Sia Decentralized file storage
Streamium and Faradam Pay in real time for on-demand services
Abra Global P2P money transmitter network
bitSIM PIN secure hardware token between SIM & Phone
Identifi Decentralized address book w/ ratings system
Coinometrics Institutional-level Bitcoin Data & Research
Blocktrail and BitGo Multisig bitcoin API
Bitcore Open source Bitcoin javascript library
Insight Open source blockchain API
Leet Kill your friends and take their money ;)

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
millibitcoin mBTC 1,000 per bitcoin SI unit for milli i.e. millilitre (mL) or millimetre (mm)
microbitcoin ?BTC 1,000,000 per bitcoin SI unit for micro i.e microlitre (?L) or micrometre (?m)
bit bit 1,000,000 per bitcoin Colloquial "slang" term for microbitcoin
satoshi sat 100,000,000 per bitcoin Smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $500 for one Bitcoin, a $10 meal would equal:
  • 0.02 BTC
  • 20 mBTC
  • 20,000 bits
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit. A complete list of bitcoin related subreddits can be found here
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
submitted by censorship_notifier to noncensored_bitcoin [link] [comments]

PSA: Clearing up some misconceptions about full nodes

It's time to clear up some misconceptions floating around about full nodes.
Myth: There are only about 5500 full nodes worldwide
This number comes from this site and it measured by trying to probe every nodes on their open ports.
Problem is, not all nodes actually have open ports that can be probed. Either because they are behind firewalls or because their users have configured them to not listen for connections.
Nobody knows how many full nodes there are, since many people don't know how to forward ports behind a firewall, and bandwidth can be costly, its quite likely that the number of nodes with closed ports is at least another several thousand.
Nodes with open ports are able to upload blocks to new full nodes. In all other ways they are the same as nodes with closed ports. But because open-port-nodes can be measured and closed-port-nodes cannot, some members of the bitcoin community have been mistaken into believing that open-port-nodes are that matters.
Myth: This number of nodes matters and/or is too low.
Nodes with open ports are useful to the bitcoin network because they help bootstrap new nodes by uploading historical blocks, they are a measure of bandwidth capacity. Right now there is no shortage of bandwidth capacity, and if there was it could be easily added by renting cloud servers.
The problem is not bandwidth or connections, but trust, security and privacy. Let me explain.
Full nodes are able to check that all of bitcoin's rules are being followed. Rules like following the inflation schedule, no double spending, no spending of coins that don't belong to the holder of the private key and all the other rules required to make bitcoin work (e.g. difficulty)
Full nodes are what make bitcoin trustless. No longer do you have to trust a financial institution like a bank or paypal, you can simply run software on your own computer. To put simply, the only node that matters is the one you use
Myth: There is no incentive to run nodes, the network relies on altruism
It is very much in the individual bitcoin's users rational self interest to run a full node and use it as their wallet.
Using a full node as your wallet is the only way to know for sure that none of bitcoin's rules have been broken. Rules like no coins were spent not belonging to the owner, that no coins were spent twice, that no inflation happens outside of the schedule and that all the rules needed to make the system work are followed (e.g. difficulty.) All other kinds of wallet involve trusting a third party server.
All these checks done by full nodes also increase the security. There are many attacks possible against lightweight wallets that do not affect full node wallets.
This is not just mindless paranoia, there have been real world examples where full node users were unaffected by turmoil in the rest of the bitcoin ecosystem. The 4th July 2015 accidental chain fork effected many kinds of wallets. Here is the wiki page on this event https://en.bitcoin.it/wiki/July_2015_chain_forks#Wallet_Advice
Notice how updated node software was completely unaffected by the fork. All other wallets required either extra confirmations or checking that the third-party institution was running the correct version.
Full nodes wallets are also currently the most private way to use Bitcoin, with nobody else learning which bitcoin addresses belong to you. All other lightweight wallets leak information about which addresses are yours because they must query third-party servers. The Electrum servers will know which addresses belong to you and can link them together. Despite bloom filtering, lightweight wallets based on BitcoinJ do not provide much privacy against nodes who connected directly to the wallet or wiretappers.
For many use cases, such privacy may not be required. But an important reason to run a full node and use it as a wallet is to get the full privacy benefits.
Myth: I can just set up a node on a cloud server instance and leave it
To get the benefits of running a full node, you must use it as your wallet, preferably on hardware you control.
Most people who do this do not use a full node as their wallet. Unfortunately because Bitcoin has a similar name to Bittorrent, some people believe that upload capacity is the most important thing for a healthy network. As I've explained above: bandwidth and connections are not a problem today, trust, security and privacy are.
Myth: Running a full node is not recommended, most people should use a lightweight client
This was common advice in 2012, but since then the full node software has vastly improved in terms of user experience.
If you cannot spare the disk space to store the blockchain, you can enable pruning. In Bitcoin Core 0.12, pruning being enabled will leave the wallet enabled. Altogether this should require less than 900MB of hard disk space.
If you cannot spare the bandwidth to upload blocks to other nodes, there are number of options to reduce or eliminate the bandwidth requirement. These include limiting connections, bandwidth targetting and disabling listening. Bitcoin Core 0.12 has the new option -blocksonly, where the node will not download unconfirmed transaction and only download new blocks. This more than halves the bandwidth usage at the expense of not seeing unconfirmed transactions.
Synchronizing the blockchain for a new node has improved since 2012 too. Features like headers-first and libsecp256k1 have greatly improved the initial synchronization time.
It can be further improved by setting -dbcache=3000 which keeps more of the UTXO set in memory. It reduces the amount of time reading from disk and therefore speeds up synchronization. Tests showed that the entire blockchain can now be synchronized in less than 3 and a half hours (Note that you'll need Bitcoin Core 0.12 or later to get all these efficiency improvements) Another example with 2h 25m
How to run a full node as your wallet.
I think every moderate user of bitcoin would benefit by running a full node and using it as their wallet. There are several ways to do this.
So what are you waiting for? The benefits are many, the downsides are not that bad. The more people do this, the more robust and healthy the bitcoin ecosystem is.
Further reading: http://www.truthcoin.info/blog/measuring-decentralization/
submitted by belcher_ to Bitcoin [link] [comments]

[uncensored-r/Bitcoin] /r/Bitcoin FAQ - Newcomers please read

The following post by BinaryResult is being replicated because some comments within the post(but not the post itself) have been silently removed.
The original post can be found(in censored form) at this link:
np.reddit.com/ Bitcoin/comments/7gfkjq
The original post's content was as follows:

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
The following videos are a good starting point for understanding how bitcoin works and a little about its long term potential:
For some more great introductory videos check out Andreas Antonopoulos's YouTube playlists, he is probably the best bitcoin educator out there today. Also have to give mention to James D'Angelo's Bitcoin 101 Blackboard series. Lots of additional video resources can be found at the videos wiki page or /BitcoinTV.
Key properties of bitcoin
  • Limited Supply - There will only ever be 21,000,000 bitcoins created and they are issued in a predictable fashion, you can view the inflation schedule here. Once they are all issued Bitcoin will be truly deflationary. The halving countdown can be found here.
  • Open source - Bitcoin code is fully auditable. You can read the source code yourself here.
  • Accountable - The public ledger is transparent, all transactions are seen by everyone.
  • Decentralized - Bitcoin is globally distributed across thousands of nodes with no single point of failure and as such can't be shut down similar to how Bittorrent works.
  • Censorship resistant - No one can prevent you from interacting with the bitcoin network and no one can censor, alter or block transactions that they disagree with, see Operation Chokepoint.
  • Push system - There are no chargebacks in bitcoin because only the person who owns the address where the bitcoins reside has the authority to move them.
  • Low fee - Transactions fees can vary between a few cents and a few dollars depending on network demand and how much priority you wish to assign to the transaction. Most wallets calculate the fee automatically but you can view current fees here.
  • Borderless - No country can stop it from going in/out, even in areas currently unserved by traditional banking as the ledger is globally distributed.
  • Trustless - Bitcoin solved the Byzantine's Generals Problem which means nobody needs to trust anybody for it to work.
  • Pseudonymous - No need to expose personal information when purchasing with cash or transacting.
  • Secure - Encrypted cryptographically and can’t be brute forced or confiscated with proper key management such as hardware wallets.
  • Programmable - Individual units of bitcoin can be programmed to transfer based on certain criteria being met
  • Nearly instant - From a few seconds to a few minutes depending on need for confirmations. After a few confirmations transactions are irreversible.
  • Peer-to-peer - No intermediaries with a cut, no need for trusted third parties.
  • Portable - Bitcoins are digital so they are easier to move than cash or gold. They can even be transported by simply remembering a string of words for wallet recovery.
  • Scalable - Each bitcoin is divisible down to 8 decimals allowing it to grow in value while still accommodating micro-transactions.
  • Designed Money - Bitcoin was created to fit all the fundamental properties of money better than gold or fiat
Some excellent writing on Bitcoin's value proposition and future can be found here. Bitcoin statistics can be found here, here and here. Developer resources can be found here and here. Peer-reviewed research papers can be found here. The number of times Bitcoin was declared dead by the media can be found here. Scaling resources here, and of course the whitepaper that started it all.

Where can I buy bitcoins?

BuyBitcoinWorldwide.com and Howtobuybitcoin.io are helpful sites for beginners. You can buy or sell any amount of bitcoin and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also, check out the bitcoinity exchange resources for a larger list of options for purchases.
Bank Transfer Credit / Debit card Cash
Coinbase Coinbase LocalBitcoins
Gemini Bitstamp LibertyX
GDAX Bitit Mycelium LocalTrader
Bitstamp Cex.io BitQuick
Kraken CoinMama WallofCoins
Xapo BitcoinOTC
Cex.io
itBit
Bitit
Bitsquare
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Cashila or Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
  • If you prefer to "Be your own bank" and have direct control over your coins without having to use a trusted third party, there are many software wallet options here. If you want easy and secure storage without having to learn computer security best practices, then a hardware wallet such as the Trezor or Ledger is recommended. A more advanced option is to secure them yourself using paper wallets generated offline. Some popular mobile and desktop options are listed below and most are cross platform.
Android iOs Desktop
Mycelium BreadWallet Electrum
CoPay AirBitz Armory
  • If you prefer to let third party "Bitcoin banks" manage your coins, try Coinbase or Xapo but be aware you may not be in control of your private keys in which case you would have to ask permission to access your funds and be exposed to third party risk.
Another interesting use case for physical storage/trans...
submitted by censorship_notifier to noncensored_bitcoin [link] [comments]

Secure paper wallet tutorial

This is my handout for paranoid people who want a way to store bitcoin safely. It requires a little work, but this is the method I use because it should be resistant to risks associated with:
  1. Bad random number generators
  2. Malicious or flawed software
  3. Hacked computers
If you want a method that is less secure but easier, skip to the bottom of this post.
The Secure Method
  1. Download bitaddress.org. (Try going to the website and pressing "ctrl+s")
  2. Put the bitaddress.org file on a computer with an operating system that has not interacted with the internet much or at all. The computer should not be hooked up to the internet when you do this. You could put the bitaddress file on a USB stick, and then turn off your computer, unplug the internet, and boot it up using a boot-from-CD copy of linux (Ubuntu or Mint for example). This prevents any mal-ware you may have accumulated from running and capturing your keystrokes. I use an old android smart phone that I have done a factory reset on. It has no sim-card and does not have the password to my home wifi. Also the phone wifi is turned off. If you are using a fresh operating system, and do not have a connection to the internet, then your private key will probably not escape the computer.
  3. Roll a die 62 times and write down the sequence of numbers. This gives you 2160 possible outcomes, which is the maximum that Bitcoin supports.
  4. Run bitaddress.org from your offline computer. Input the sequence of numbers from the die rolls into the "Brain Wallet" tab. By providing your own source of randomness, you do not have to worry that the random number generator used by your computer is too weak. I'm looking at you, NSA ಠ_ಠ
  5. Brain Wallet tab creates a private key and address.
  6. Write down the address and private key by hand or print them on a dumb printer. (Dumb printer means not the one at your office with the hard drive. Maybe not the 4 in 1 printer that scans and faxes and makes waffles.) If you hand copy them you may want to hand copy more than one format. (WIF and HEX). If you are crazy and are storing your life savings in Bitcoin, and you hand copy the private key, do a double-check by typing the private key back into the tool on the "Wallet Details" tab and confirm that it recreates the same public address.
  7. Load your paper wallet by sending your bitcoin to the public address. You can do this as many times as you like.
  8. You can view the current balance of your paper wallet by typing the public address into the search box at blockchain.info
  9. If you are using an old cell phone or tablet do a factory reset when you are finished so that the memory of the private keys is destroyed. If you are using a computer with a boot-from-CD copy of linux, I think you can just power down the computer and the private keys will be gone. (Maybe someone can confirm for me that the private keys would not be able to be cached by bitaddress?)
  10. To spend your paper wallet, you will need to either create an offline transaction, or import the private key into a hot wallet. Creating an offline transaction is dangerous if you don't know what you are doing. Importing to a client side wallet like Bitcoin-Qt, Electrum, MultiBit or Armory is a good idea. You can also import to an online wallet such as Blockchain.info or Coinbase.
Trusting bitaddress.org
The only thing you need bitaddress.org to do is to honestly convert the brainwallet passphrase into the corresponding private key and address. You can verify that it is doing this honestly by running several test passphrases through the copy of bitaddress that you plan on using, and several other brainwallet generators. For example, you could use the online version of bitaddress, and brainwallet and safepaperwallet and bitcoinpaperwallet. If you are fancy with the linux command line, you can also try "echo -n my_die_rolls | sha256sum". The linux operating system should reply with the same private key that bitaddress makes. This protects you from a malicious paper wallet generator.
Trusting your copy of bitaddress.org
Bitaddress publishes the sha1 hash of the bitaddress.org website at this location:
https://www.bitaddress.org/pgpsignedmsg.txt
The message is signed by the creator, pointbiz. I found his PGP fingerprint here:
https://github.com/pointbiz/bitaddress.org/issues/18
"527B 5C82 B1F6 B2DB 72A0 ECBF 8749 7B91 6397 4F5A"
With this fingerprint, you can authenticate the signed message, which gives you the hash of the current bitaddress.org file. Then you can hash your copy of the file and authenticate the file.
I do not have a way to authenticate the fingerprint itself, sorry. According to the website I linked to, git has cryptographic traceability that would enable a person to do some research and authenticate the fingerprint. If you want to go that far, knock yourself out. I think that the techniques described in this document do not really rely on bitaddress being un-corrupt. Anyway, how do we know pointbiz is a good guy? ;-)
There are a lot of skilled eyes watching bitaddress.org and the signed sha1 hash. To gain the most benefit from all of those eyes, it's probably worthwhile to check your copy by hashing it and comparing to the published hash.
"But we aren't supposed to use brainwallets"
You are not supposed to use brainwallets that have predictable passphrases. People think they are pretty clever about how they pick their passphrases, but a lot of bitcoins have been stolen because people tend to come up with similar ideas. If you let dice generate the passphrase, then it is totally random, and you just need to make sure to roll enough times.
How to avoid spending your life rolling dice
When I first started doing this, I rolled a die 62 times for each private key. This is not necessary. You can simply roll the die 62 times and keep the sequence of 62 numbers as a "seed". The first paper address you create would use "my die rolls-1" as the passphrase, the second would be "my die rolls-2" and so on. This is safe because SHA256 prevents any computable relationship between the resulting private key family.
Of course this has a certain bad security scenario -- if anyone obtains the seed they can reconstruct all of your paper wallets. So this is not for everyone! On the other hand, it also means that if you happen to lose one of your paper wallets, you could reconstruct it so long as you still had the seed.
One way to reduce this risk is to add an easy to remember password like this: "my die rolls-password-1".
If you prefer, you can use a technique called diceware to convert your die rolls to words that still contain the same quantity of entropy, but which could be easier to work with. I don't use diceware because it's another piece of software that I have to trust, and I'm just copy/pasting my high entropy seed, so I don't care about how ugly it is.
Why not input the dice as a Base 6 private key on the Wallet Details tab?
Two reasons. First of all, this option requires that you roll the die 99 times, but you do not get meaningful additional protection by rolling more than 62 times. Why roll more times if you don't have to? Second, I use the "high entropy seed" method to generate multiple private keys from the same die rolls. Using the Base 6 option would require rolling 99 times for every private key.
I'm a big nerd with exotic dice. How many times to roll?
Put this formula in Excel to get the number of times to roll: "=160*LOG(2,f)" where f = number of faces on the die. For example, you would roll a d16 40 times. By the way, somewhat unbelievably casino dice are more fair than ordinary dice
The "Change address" problem:
You should understand change addresses because some people have accidentally lost money by not understanding it.
Imagine your paper wallet is a 10 dollar bill. You use it to buy a candy bar. To do this you give the cashier the entire 10 dollar bill. They keep 1 dollar and give you 9 dollars back as change.
With Bitcoin, you have to explicitly say that you want 9 dollars back, and you have to provide an address where it should go to. If you just hand over the 10 dollar bill, and don't say you want 9 dollars back, then the miner who processes the transaction gives 1 dollar to the store and keeps the remainder themselves.
Wallet software like Bitcoin-Qt handles this automatically for you. They automatically make "change addresses" and they automatically construct transactions that make the change go to the change address.
There are three ways I know of that the change problem can bite you:
  1. You generate a raw transaction by hand, and screw up. If you are generating a transaction "by hand" with a raw transaction editor, you need to be extra careful that your outputs add up to the same number as your inputs. Otherwise, the very lucky miner who puts your transaction in a block will keep the difference.
  2. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the paper wallet. The change is not in the paper wallet. It is in a change address that the wallet software generated. That means that if you lose your wallet.dat file you will lose all the change. The paper wallet is empty.
  3. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the change address that the wallet software generated. If the transaction did not need to consume all of the "outputs" used to fund the paper wallet, then there could be some unspent outputs still located at the address of the paper wallet. If you destroyed the paper wallet, and destroyed the copy of the private key imported to the wallet software, then you could not access this money. (E.g. if you restored the software wallet from its seed, thinking all of the money was moved to the wallet-generated change addresses.)
For more on this, see here
The hot paper wallet problem
Your bitcoin in your paper wallet are secure, so long as the piece of paper is secure, until you go to spend it. When you spend it, you put the private key onto a computer that is connected to the internet. At this point you must regard your paper wallet address as hot because the computer you used may have been compromised. It now provides much less protection against theft of your coins. If you need the level of protection that a cold paper wallet provides, you need to create a new one and send your coins to it.
Destroying your paper wallet address
Do not destroy the only copy of a private key without verifying that there is no money at that address. Your client may have sent change to your paper wallet address without you realizing it. Your client may have not consumed all of the unspent outputs available at the paper wallet address. You can go to blockchain.info and type the public address into the search window to see the current balance. I don't bother destroying my used/empty paper wallet addresses. I just file them away.
Encrypting your private key
BIP 0038 describes a standardized way to encrypt your paper wallet private key. A normal paper wallet is vulnerable because if anyone sees the private key they can take the coins. The BIP38 protocol is even resistant to brute force attacks because it uses a memory intensive encryption algorithm called scrypt. If you want to encrypt your wallets using BIP38, I recommend that you use bitcoinpaperwallet because they will let you type in your own private key and will encrypt it for you. As with bitaddress, for high security you should only use a local copy of this website on a computer that will never get connected to the internet.
Splitting your private key
Another option for protecting the private key is to convert it into multiple fragments that must be brought together. This method allows you to store pieces of your key with separate people in separate locations. It can be set up so that you can reconstitute the private key when you have any 2 out of the 3 fragments. This technique is called Shamir's Secret Sharing. I have not tried this technique, but you may find it valuable. You could try using this website http://passguardian.com/ which will help you split up a key. As before, you should do this on an offline computer. Keep in mind if you use this service that you are trusting it to work properly. It would be good to find other independently created tools that could be used to validate the operation of passguardian. Personally, I would be nervous destroying the only copy of a private key and relying entirely on the fragments generated by the website.
Looks like Bitaddress has an implementation of Shamir's Secret Sharing now under the "Split Wallet" tab. However it would appear that you cannot provide your own key for this, so you would have to trust bitaddress.
Durable Media
Pay attention to the media you use to record your paper wallet. Some kinds of ink fade, some kinds of paper disintegrate. Moisture and heat are your enemies.
In addition to keeping copies of my paper wallet addresses I did the following:
  1. Order a set of numeric metal stamps. ($10)
  2. Buy a square galvanized steel outlet cover from the hardware store ($1)
  3. Buy a sledgehammer from the hardware store
  4. Write the die rolls on the steel plate using a sharpie
  5. Use the hammer to stamp the metal. Do all the 1's, then all the 2's etc. Please use eye protection, as metal stamp may emit sparks or fly unexpectedly across the garage. :-)
  6. Use nail polish remover to erase the sharpie
Electrum
If you trust electrum you might try running it on an offline computer, and having it generate a series of private keys from a seed. I don't have experience with this software, but it sounds like there are some slick possibilities there that could save you time if you are working with a lot of addresses.
Message to the downvoters
I would appreciate it if you would comment, so that I can learn from your opinion. Thanks!
The Easy Method
This method is probably suitable for small quantities of bitcoin. I would not trust it for life-altering sums of money.
  1. Download the bitaddress.org website to your hard drive.
  2. Close your browser
  3. Disconnect from the internet
  4. Open the bitaddress.org website from your hard drive.
  5. Print a paper wallet on your printer
  6. Close your browser
submitted by moral_agent to BitcoinWallet [link] [comments]

The World Wide Web runs on webservers in datacenters. The World Wide Blockchain should also run on "blockservers" in datacenters. The "sweet spot" of Bitcoin scaling, reliability, security & convenience is *nodes in the cloud* + *private keys offline*. The is the future of Bitcoin. Let's embrace it.

Four-Line Summary
(1) Bitcoin nodes (and everyone's public addresses) should be online - in datacenters.
(2) Bitcoin wallets (and your private keys) should be offline - in your pocket.
(3) This architecture provides the optimal combination or "sweet spot" for short-term and long-term Bitcoin scaling, reliability, security & convenience.
(4) The best communications strategy is for us to embrace the approach of "nodes-in-datacenters" a/k/a "blockservers-in-the-cloud" - instead of apologizing for it.
Longer Summary
(1) Bitcoin nodes should be online - on "online public blockservers", ideally running on big, powerful webservers with high connectivity & high-end specs, in datacenters.
(2) Bitcoin private keys should be offline - in "offline private wallets", ideally running on tiny, cheap computers with no connectivity & low-end specs, in your pocket.
https://blockchainbdgpzk.onion/pushtx
(3) We should embrace "nodes-in-datacenters" (ie, "blockservers-in-the-cloud") and "keys-in-your-pocket" as the future of Bitcoin, providing the optimal combination (or "sweet spot") of scaling, reliability, security & convenience.
Details
Bitcoin has been a success for 7 years and is continuing to grow and needs a simple and safe way to scale.
So, now it is time for people to embrace nodes-in-datacenters a/k/a blockservers-in-the-cloud (plus private keys offline - to enable 100% security with "offline signing of transactions") as Bitcoin's future.
Why?
(1) ...because everything on the web actually works this way already - providing the optimal combination of scaling, reliability, security & convenience.
  • You already keep your passwords for websites and webmail on you - usually physically offline (in your head, written on a slip of paper, or maybe in an offline file, etc.)
  • When was the last time you ran a server out of your home to continually spider and index terabytes of data for the entire web?
  • Why should you need to hold 60 GB of data (and growing) when you just want to check the balance of a single Bitcoin address (eg, one of your addresses)?
  • Bitcoin is still very young, and if in order to fulfill its earlier promise about banking the unbanked, microtransactions, DACs (decentralized autonomous corporations), IoT (Internet of Things), smart contracts, etc., then we should hope and expect that the blockchain will someday take up terabytes, not "mere" gigabytes - just like Google's giant search engine index, which they update every few minutes.
  • Do you really think you should be performing this kind of heavy-duty indexing, querying and "serving" on a low-end machine behind a low-end connection in your home, when companies like Google can do it so much better?
  • As long as you physically control your own private keys, who cares if you rely on blockchain.info or blockexplorer.com (or someday: bitcoin.google.com or bitcoin.msn.com or bitcoin.yahoo.com) to lookup up public information about balances and transactions on Bitcoin addresses?
  • They're not going to be able to lie to you. The meaning of "permissionless" and "decentralized" is that anybody can set up a full-node / "blockserver" (plus "blockchain search engines"), and anybody can (and will) immediately report it to the whole world if a website like blockchain.info or blockexplorer.com (or someday: bitcoin.google.com or bitcoin.msn.com or bitcoin.yahoo.com) provides false information - which would seriously damage their business, so they'll never do it.
(2) ...because webservers and webmail don't lie to you, and "nodes-in-datacenters" (ie, "blockservers-in-the-cloud") aren't going to be able to lie to you either - since it would not be in their interest, and they would get caught if they did.
  • When was the last time google.com or or yahoo.com or msn.com (bing.com) lied to you when you performed a search or looked up some news?
  • When was the last time blockchain.info or blockexplorer.com lied to you when you checked the balance at a Bitcoin address?
  • Currently, with billions of websites and news sources ("webservers") running around the world in datacenters, there are "web search engines" (eg, google.com or news.google.com or msn.com or yahoo.com) where you can look up information and news on the World Wide Web. In order to survive, the business model of these "web search engines" is about getting lots of visitors, and providing you with reliable information. It's not in their best interests to lie - so they never do. These sites simply "spider" / "crawl" / "index" the entire massive web out there (every few minutes actually), and then conveniently filter / aggregate / present the results as a free service to you.
  • In the future, when there are 10,000 or 100,000 Bitcoin full-nodes ("blockservers") running around the world in datacenters, there will be "blockchain search engines" (eg, bitcoin.google.com or bitcoin.msn.com or bitcoin.yahoo.com - just like we already have blockchain.info and blockexplorer.com, etc.) where you will be able to lookup transactions and balances on the World Wide Blockchain. In order to survive, their business model will be about getting lots of visitors, and providing you with reliable information. It's not going to be in their best interests to lie - so they never will. These sites will simply "spider" / "crawl" / "index" the entire massive blockchain out there (every few minutes actually), and then conveniently filter / aggregate / present the results as a free service to you.
  • The business model for "blockchain search engines" might eventually showing ads or sponsored content along with the Bitcoin blockchain search functions which we are primarily interested in. This would be quite usable and simple and safe, and similar to how most people already use sites like google.com, yahoo.com, msn.com, etc.
(3) ...because "nodes-in-datacenters" (ie, "blockservers-in-the-cloud") provide simple scaling now.
  • Nodes-in-the-cloud are the only solution which can provide scaling now - using existing, tested software - by simply adjusting - or totally eliminating - the MAXBLOCKSIZE parameter.
  • They can use existing, tested, reliable software: thousands of 2MB+ nodes are already running.
  • About 1,000 Classic nodes have been spun up in AWS ECS datacenters (Amazon Web Services - Elastic Computer Cloud) in the past month. (Uninformed yes-men at r\bitcoin try to spin this as a "bad thing" - but we should embrace it as a "good thing", explicitly espousing the philosophy outlined in this post.)
  • "Nodes-in-datacenters" (ie, "blockservers-in-the-cloud") can be flexibly and easily configured to provide all the scaling needed in terms of:
    • Bandwidth (throughput)
    • Hard drive space (storage)
    • RAM (memory)
    • CPU (processing power)
  • The yes-men and sycophants and authoritarians and know-nothings on the censored subreddit r\bitcoin are forever fantasizing about some Rube Goldberg vaporware with a catchy name "Lightning Network" which doesn't even exist, and which (at best, if it ever does come into existence) would be doomed to be slow, centralized and expensive. LN is a non-thing.
  • Those same people on the censored r\bitcoin forum are desperately trying to interpret the thousands of Classic nodes as a negative thing - and their beloved non-existent Lightning Network as a positive thing. This is the kind of typical down-is-up, black-is-white thinking that always happens in a censorship bubble - because the so-called Lightning Network isn't even a thing - while Classic is a reality.
(4) ...because "nodes-in-datacenters" (ie, "blockservers-in-the-cloud") provide more reliability / availability.
  • 24/7/365 tech support,
  • automatic server reboots,
  • server uptime guarantees,
  • electrical power uptime guarantees.
(5) ...because "nodes-in-datacenters" (ie, "blockservers-in-the-cloud") provide better security.
(6) ...because "nodes-in-datacenters" (ie, "blockservers-in-the-cloud") provide more convenience.
(7) ...because separating "full-node" functionality from "wallet" functionality by implementing "hierarchical deterministic (HD)" wallets is cleaner, safer and more user-friendly.
Armory, BIP 0032 provide "hierarchical deterministic (HD)" wallets.
https://en.bitcoin.it/wiki/BIP_0032
https://en.bitcoin.it/wiki/Deterministic_Wallet
http://www.bitcoinarmory.com/tutorials/armory-advanced-features/offline-wallets/
https://en.bitcoin.it/wiki/How_to_set_up_a_secure_offline_savings_wallet
http://bitcoin.stackexchange.com/questions/16646/offline-wallets-electrum-vs-armory
https://www.youtube.com/watch?v=DQumISxkJsQ
  • "Hierarchical deterministic" wallets are required in order to be able to keep private keys offline, and "offline-sign" transactions. This is because a wallet needs to be "deterministic" in order to be able to generate the same sequence of random private keys in the offline wallet and the online wallet.
  • "Hierarchical deterministic (HD)" wallets are also required in order to allow a user to perform a single, one-time, permanent backup of their wallet - which lasts forever (since a HD wallet already deterministically "knows" the exact sequence of all the private keys which it will generate, now and in the future - unlike the antiquated wallet in Core / Blockstream's insecure, non-user-friendly Bitcoin implementation, which pre-generates keys non-deterministically in batches of 100 - so old backups of Core / Blockstream wallets could actually be missing later-generated private keys, rendering those backups useless).
  • Bitcoin is now over 7 years old, but Core / Blockstream has mysteriously failed to provide this simple, essential feature of HD wallets - while several other Bitcoin implementations have already provided this.
  • This feature is extremely simple, because it is all done entirely offline - not networking, no game theory, no non-deterministic behavior, no concurrency. The "HD wallet" functionality just needs some very basic, standard crypto and random-number libraries to generate a "seed" which determines the entire sequence of all the private keys which the wallet can generate.
  • Newer Bitcoin implementations (unlike Core / Blockstream) have now "modularized" their code, also separating "full-node" functionality from "wallet" functionality at the source code level:
  • in Golang - "btcsuite" from Conformal, providing "btcd" (node) and "btcwallet" (wallet):
  • in Haskell + MySQL/SQLite - "Haskoin":
  • There is also a Bitcoin implementation which provides only a full-node:
  • in Ruby + Postgres - "Toshi" from CoinBase:
  • [Tinfoil] The fact that Core / Blockstream has failed to provide HD and failed to clean up and modularize its messy spaghetti code - and the fact that Armory is now out of business (and both companies received millions of dollars in venture capital, and the lead dev of Armory left because the investors were creating needless obstacles regarding intellectual property rights, licensing, etc.) - these facts are suspicious because suggest that these corporations may be trying to discourage dev-friendliness, user-friendliness, security, convenience, and on-chain scaling.
(8) ...because the only thing most users really want and need is total physical control over their private keys.
  • Most people do not want or need to run a Bitcoin full-node, because:
    • A Bitcon full-node consumes lots of disk space and bandwidth, and can be expensive and complicated to set up, run, maintain, and secure.
    • A Bitcoin full-node requires an extremely high level of hardware and software security - which most computer users have never even attempted.
  • As Armory or Electrum users know, the simplest and safest way to provide 100% guaranteed security is by using "offline storage" or "cold storage" or "air gap".
  • In other words, ideally, you should never even let your private keys touch a device which has (or had) the hardware and/or software to go online - ie: no Wi-Fi, no 3G, and no Ethernet cable.
  • This offline machine is used only to generate private keys (where a Bitcoin private key is literally actually just any truly random number up to around 1078 ) - and also used to "offline-sign" transactions.
  • So it is simplest and safest if your private keys are on an offline machine which never can / did go online - and such as machine can be very cheap, because it really only needs to run some very basic random-number-generator and crypto libraries.
  • It would be simplest and safest for people to own a tiny cheap 100% secure offline computer to use only for:
    • generating / storing Bitcoin private keys
    • signing Bitcoin transactions
    • possibly also for generating / storing other kinds of private keys (other cryptocurrencies, GPG keys, etc.)
Four-Line Summary / Conclusion:
(1) Bitcoin nodes (and everyone's public addresses) should be online - in datacenters.
(2) Bitcoin wallets (and your private keys) should be offline - in your pocket.
(3) This architecture provides the optimal combination or "sweet spot" for short-term and long-term Bitcoin scaling, reliability, security & convenience.
(4) The best communications strategy is for us to embrace the approach of "nodes-in-datacenters" a/k/a "blockservers-in-the-cloud" - instead of apologizing for it.
submitted by ydtm to btc [link] [comments]

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