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Bitcoin Core 31.0 - privatebroadcast feature has a privacy vulnerability
This vulnerability occurs when private broadcast nodes support BIP324 v2 transmission over IPv4 or IPv6. If the v2 handshake fails, Bitcoin Core will retry with v1, but this reconnection will not go through the Tor proxy and will connect directly via IPv4 or IPv6.
Affected are Bitcoin Core 31.0 nodes that have enabled -privatebroadcast, broadcast transactions via sendrawtransaction RPC, and can directly establish outbound IPv4/IPv6 connections; wallet RPC, onion, and I2P nodes are not affected.
Bitcoin Core recommends that users disable -privatebroadcast, disable v2 transmission, or route outbound IPv4/IPv6 traffic through Tor before upgrading to 31.1.