ColdCard is another Bitcoin hardware wallet developed by a team in Canada, its used to sign transactions and can be used both online and offline, it runs PSBTs natively so it can run completely offline for its entire lifecycle.

Notable issues and merges on Bitcoin Core, LND, c-lightning and libsecp256k1 Originally published by BitcoinOptech on newsletter #19 Bitcoin Core #14451 Allows optionally building Bitcoin-Qt without support for the BIP70 payment protocol and adds a deprecation warning indicating the default support may be removed in a future release. The CEO of BitPay, which is the largest user of BIP70 (but which wants to use a different version of the protocol), indicated that they supported Bitcoin Core removing BIP70.

Bitcoin Core version 0.17.0 is now available from: https://bitcoincore.org/bin/bitcoin-core-0.17.0/ Notable changes Changed configuration options -includeconf=<file> can be used to include additional configuration files. Only works inside the bitcoin.conf file, not inside included files or from command-line. Multiple files may be included. Can be disabled from command- line via -noincludeconf. Note that multi-argument commands like -includeconf will override preceding -noincludeconf, i.e. noincludeconf=1 includeconf=relative.conf as bitcoin.conf will still include relative.

Multisig transactions ¹ have been a great use case of Bitcoin for the past few years, they require unsigned or partially signed transactions to be passed between multiple parties to “co-sign” them. However, there is currently no unified format for how multiple parties may share these transactions between multiple signers, it depends on the particular implementation for each wallet making it hard to do among parties using different Bitcoin wallets.

A draft BIP (174), which was proposed last year by Andrew Chow, was recently a subject of interest among Bitcoin developers. It aims to create a standard extensible format that different clients can implement making Partially Signed Bitcoin Transactions (PSBT) easier to pass around users to sign and combine their signatures.