Bitcoin, Explained 65: Bitcoin Core 24.0
In this episode of Bitcoin, Explained, hosts Aaron van Wirdum and Sjors Provoost discuss the upcoming Bitcoin Core major release, Bitcoin Core 24.0.
The Bitcoin Core project produces a new major release of its software roughly every six months. The 24th major release is currently in its release candidate phase, which means that it is being tested and could technically be released any day now (though this phase will probably last a few more weeks). In the episode, Aaron and Sjors discuss seven of the most notable changes included in Bitcoin Core 24.0.
This includes a change to how nodes download blocks when they sync with the network. While previous Bitcoin Core versions already started by downloading only block headers to make sure that the blocks they download have sufficient proof of work on them, Bitcoin Core 24.0 nodes will initially not store these block headers in order to prevent a certain type of resource exhaustion attack. Aaron and Sjors explain that this should eventually also allow for the removal of any checkpoints in the Bitcoin Core codebase.
They go on to explain that Bitcoin Core 24.0 also includes an added option for users to apply full replace-by-fee (RBF) logic. Where Bitcoin Core nodes so far would apply the “first seen” rule, which meant that conflicting transactions wouldn’t be accepted in the node's memory pool (mempool) and forwarded to peers, Bitcoin Core 24.0 users can choose to make their nodes accept and forward conflicting transactions if they include a higher fee than (the) earlier transaction(s) they conflict with.
Further upgrades discussed by Aaron and Sjors include a tool to migrate legacy wallets to descriptor wallets, initial miniscript support, default use of RBF when creating transactions, an improved UTXO selection algorithm which randomizes change output amounts for extra privacy, and a new “send all” function to spend a particular (set of) UTXO(s) in full.
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