Notes

Rumors, Lies and Bitcoin Wallet Address
But with each successive CoinJoin transaction, the coins are mixed with another new user's payment, and the likelihood of guessing which change address belongs to which user is cut in half again. Alice wouldn’t be allowed to rip a $10 bill in half to pay Bob $5. If, say, Alice is buying alpaca socks from an online sock seller and Bob is buying LSD on the Silk Road, Dark Wallet will combine their transactions so that the blockchain records only a single movement of funds. In the beach resort of Phuket, Thailand, last month, the assailants pushed their victim, a young Russian man, into his apartment and kept him there, blindfolded, until he logged onto his computer and transferred about $100,000 worth of Bitcoin to an online wallet they controlled. For example, if you ordered a produce from amazon, received it, then inspect the parcel with a magic wand that told you the last place the parcel was shipped you might find it was last sent to a reshipment center in Oregon. In fact, many of you might even assume that you don’t need your own wallet at all-after all, mining pools and currency exchanges are more than happy to hold your money for you, right?

But as dangerous as Wilson's vision may be, Dark Wallet also fills a real need for privacy in the bitcoin economy. Dark Wallet was conceived last summer by Wilson and Amir Taaki. Why should we put the onus on new users to know the difference between various blockchains/Layer 2s and know what their wallet can and can't support? For its part, Apple hasn't said publicly exactly why it's killed off the Blockchain application. CNET has contacted Apple for comment. The New York Department of Financial Services, which held hearings about bitcoin in January and says it plans to create a "bitlicense" for some bitcoin-based businesses, didn't respond to a request for comment. Silk Road allowed the trading of all sorts of illegal goods and services, from malicious software to hard drugs, through a user-friendly, Amazon-like interface. The bitcoins simultaneously leave Alice's and Bob's addresses and are paid to the sock seller and the Silk Road.

What address did your friend or the "company" he used send the bitcoins to? The company on Wednesday removed from its App Store the last remaining Bitcoin wallet application, Blockchain. Some blogs have speculated that it might be a precursor to Apple launching its own digital wallet service to compete with Google Wallet and others, but the company has not confirmed that's the case. It was the last of a series of Bitcoin wallet apps Apple has nixed. Government regulators around the world have spent the last year scrambling to prevent bitcoin from becoming the currency of choice for money launderers and black marketeers. If bitcoiners don't take special pains to anonymize their coins, all of their spending can potentially be traced back to their bitcoin addresses by any corporation or government agency that cares to look. One bitcoin privacy issue CoinJoin solves relates to what are known as "change addresses." When bitcoins from any single address are spent, the unspent fraction of coins are sent back to a change address that the spender controls. It truly is one of the best ways to secure your Bitcoin wallet.

To protect the identity of the user receiving coins instead of spending them, Dark Wallet offers a different technique known as a stealth address. Future transactions from that change address can be tied to the same user. To mix their coins further, users can also run CoinJoin on their bitcoins when they're not making a real payment, instead sending them to another address they own. In its current form, Taaki says Dark Wallet protects IPs only by obscuring them behind the server that negotiates CoinJoin transactions, which may still leave users vulnerable to identification by sophisticated traffic analysis. Any user can ask Dark Wallet to generate a stealth address along with a secret key and then publish the stealth address online as his or her bitcoin receiving address. The recipient's Dark Wallet client then scans the blockchain for any address it can decrypt with the user's secret key, finds the stealth payment, and claims it for the user. By encrypting and mixing together its users' payments, Dark Wallet seeks to enable practically untraceable flows of money online that add new fuel to the Web's burgeoning black markets.
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