12952: after being deprecated for several major release and disabled by default in the upcoming 0.17 release, the built-in accounts system in Bitcoin Core has been removed from the master development branch. Reminder: new merges to Bitcoin Core are made to its master development branch and encoinguide.com are unlikely to become part of the upcoming 0.17 release-you’ll probably have to wait until version 0.18 in about six months from now. What is Cryptocurrency Exchange Development? Individuals cannot freely exchange their national currency – the birr – with dollars, and vice versa. The draft even explicitly allocates the XBT currency code to Bitcoin. This can provide up to a 9x speed-up over Bitcoin Core 0.16.x for cases where the new code applies and is supported by the user’s CPU. Figure 2.1 shows the daily closing dollar-bitcoin exchange rate on the Mt. Gox exchange up until February 2014 and thereafter on the Bitstamp exchange, which took over the top spot in trading volume after Mt. Gox folded. According to the report, Travelex is also the first bank in Brazil to be registered with and receive permission to do foreign exchange business from the country’s Central Bank. Optech has begun planning its first European workshop, which is set to take place in Paris sometime in November.
But the Biden administration and European allies had held off on one measure that many were calling for them to take against Russia and Putin. For example, in the Eltoo smart contract protocol aimed augmenting Lightning Network (LN), Alice and Bob sign each change of balance in a payment channel with this new sighash flag so that, when they want to close the channel, either one of them can use the transaction with the final balance to spend from the transaction with the initial balance. But while researching this story, it was easy to conclude at least one thing for sure — most news headlines tend to sensationalize the dark Web and its seedier side, and rarely mention the untapped potential of the deep Web. The euphoric news surrounding bitcoin at the end of 2013 gave way to catastrophe in February 2014, when the Mt. Gox exchange, once the leader in worldwide bitcoin trading, imploded in a spectacular bankruptcy. The first is that there’s no known way to verify them as fast as Schnorr signatures-and signature verification speed is also important for network scalability. In BIP143, segwit preserved all of the original Bitcoin 0.1 signature hash (sighash) flags but made some minor (but useful) changes to what data wallets include in the hash that made it harder for miners to DoS attack other miners and which made it easier for underpowered devices such as hardware wallets to protect users funds.
If the changes are adopted, some of the notable advantages include: making it easier for hardware wallets to securely participate in CoinJoin-style transactions as well as other smart contracts, potentially easier fee bumping by any individual party in a multiparty transaction, and preventing counter parties and third parties to sophisticated smart contracts from bloating the size of multiparty transactions in a DoS attack that lowers a transaction’s fee priority. The attack was considered unlikely given that much cheaper attacks of roughly equal effectiveness are well known. 13451 that adds extra information that can be used to defeat the attack to the getblock RPC. In addition, transactions can be linked to individuals and companies through “idioms of use” (e.g., transactions that spend coins from multiple inputs indicate that the inputs may have a common owner) and corroborating public transaction data with known information on owners of certain addresses. If any member companies who think they’ll be able to attend have topics they’re interested in discussing, please email Optech. Verify yourself and click on “Register” to proceed and you’ll receive a confirmation email. A discussion was started on the Bitcoin-Dev mailing list about resetting testnet again to provide a smaller chain for experimentation.
● Discussion of arbitrary contracts over LN: a thread on the Lightning Network (LN) development mailing list last week described the basic principles for performing arbitrary Bitcoin contracts in a payment channel. Cryptographer Tim Ruffing provided constructive criticism of the draft on the Bitcoin-Dev mailing list this week that received also-constructive rebuttals from Schnelli and Gregory Maxwell. This week, BIP143 co-author Johnson Lau posted some suggested changes to sighash flags, including new flags, that could be implemented as a soft fork using the witness script update mechanism provided as part of segwit. ● Optech dashboard: a blog post by Marcin Jachymiak introduces the live dashboard he developed for Optech during his internship this summer, providing not only an overview of what information the dashboard makes available to you but a description of how he built it for anyone who wants to independently replicate the data or otherwise extend the dashboard using their own full node. ● Library announced for BLS signatures: well-known developer Bram Cohen announced a “first draft (but fully functional) library for doing BLS signatures based on a construction based on MuSig”. In a reply sent to the Lightning-Dev mailing list, Decker explains why he thinks the current draft specification will be fundamentally compatible with both payments to Bitcoin addresses and Lightning Network payments.