In the previous iteration with endorsement
signaling, the recommendation was for the sender to
set it to 1 and that could have had privacy concerns
when first deploying given that the default was to
downgrade the signal to 0. In the latest proposal
the recommended default for both sending and
forwarding nodes is to set `accountable` to 0.
As a result, the dates have been removed given
that there are no privacy risks associated
with relaying the signal with zero values.
Document the new MuSig2RegisterCombinedNonce and MuSig2GetCombinedNonce RPC
methods in the v0.21.0 release notes. These methods enable coordinator-based
signing patterns as an alternative to the standard MuSig2RegisterNonces
workflow.
Slyghtning