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● Help test Bitcoin Core 0.18.0 release candidates: Bitcoin Core’s third RC for its next major version is available and a fourth is being prepared. The examples of problems are not made to criticize the pioneering developers of those systems, but to help all Bitcoin developers learn how to master the powerful fee-management capability that RBF provides. Open a new issue if you discover any problems. Testing by organizations and experienced LN users is encouraged to catch any regressions or serious problems that could affect users of the final release. We thus discover that the first block mined by Satoshi is the genesis block of an alternative network probably used for testing purposes. This week’s newsletter requests testing of the latest release candidates for Bitcoin Core and LND, describes how helping people accept payments to bech32 addresses can lower fees, and lists notable code changes in popular Bitcoin projects. A random spectator at a televised sports event held up a placard with a QR code and Suggested Web page the text "Send me Bitcoin! This week’s newsletter describes a proposed LN feature to allow making spontaneous payments and provides our longest-ever list of notable code changes to popular Bitcoin infrastructure projects.

In the simplest implementation, the server would then require you to input a code from the Google Authenticator app on your smartphone in order to provide a second verification that it is indeed you who wants to send the funds, and upon successful verification it would then sign the transaction and broadcast the transaction with two signatures to the network. This replaces a hardcoded minimum of 0.00001 BTC previously in the code. If the supply of available block weight increases and demand remains constant, we expect prices to go down (unless they’re already at the default minimum relay fee). Because the transactions use less block weight, there’s more weight available for other transactions. Traditional finance giants are excited about the idea of putting ownership of assets like precious metals, art, homes and more on the blockchain. The blockchain only records the start and end of the channel. Although the complete blockchain is not needed all at once since it is possible to run in pruning mode. The user can still generate a P2SH-wrapped segwit address by unchecking a box on the Request Payment screen in case they need to receive money from a service that doesn’t yet provide bech32 sending support.

But these still represent genuine constraints grounded in the laws of physics. The major constraints are disk i/o, bandwidth and storage capacity. 2439 adds the default policy for the watchtower, such as allowing the tower to handle a maximum of 1,024 updates from a client in a single session, allowing the watchtower to receive a reward of 1% of the channel capacity if the tower ends up defending the channel, and setting the default onchain feerate for justice transactions (breach remedy transactions). So, for simplicity’s sake, we’ll just plot the sizes of legacy P2SH-multisig compared to wrapped P2SH-P2WSH multisig (up to the maximum 15-of-15 supported by legacy P2SH). CHECKMULTSIG opcode), things get more complex because k-of-n multisig inputs vary in size depending on the number of signatures (k) and the number of public keys (n). The same pull request also causes the invoice RPC to include route hints for private channels if you have no public channels unless you also set the new exposeprivatechannels parameter to false. Route hints suggest part of a routing path to the spender so they can send payments through nodes they previously didn’t know about.

When the payment reaches the receiver, they decrypt the preimage and disclose it to the routing nodes in order to claim the payment. This takes advantage of LN’s Tor-like onion routing by allowing a spender to choose a preimage, encrypt it so that only the receiver’s node can decrypt it, and then route a payment along LN like normal using the hash of the preimage. 2234 extends the listchannels RPC to take a source parameter for filtering by node id. ● PR opened for spontaneous LN payments: LN protocol developer Olaoluwa Osuntokun opened a pull request to allow an LN node to send a payment to another node without first receiving an invoice. Occasionally, two miners discover blocks close enough together that the network doesn't agree about who was first. ● RBF usability study published: with only about 6% of the transactions confirmed in 2018 signaling support for BIP125 opt-in Replace-by-Fee (RBF), Optech contributor Mike Schmidt undertook an examination of almost two dozen popular Bitcoin wallets, block explorers, and other services to see how they handled either sending or receiving RBF transactions (including fee bumps).