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P2P and network changes

  • The protocol version was bumped to 70241. The dsa message gained a version-gated flags field declaring which mixing direction a participant intends. A session commits to carrying promotion/demotion entries only once a participant is admitted that actually declared one, and it becomes closed to pre-70241 clients only from that point on; conversely, a session that has already admitted a pre-70241 client refuses later promotion/demotion participants. Either way the refusal happens at acceptance time, before any collateral is committed, so a client doing ordinary 1:1 mixing is never turned away from a session simply because of who opened it. Unbalanced (promotion/demotion) DSTXes are only announced as dstx to peers at protocol 70241 or newer, since older peers would reject them as structurally invalid and penalize the relayer; those peers are sent a plain tx announcement instead, so they still receive the transaction without the mixing metadata they cannot parse. (#7052)

  • A mixing session only completes once each side of its denomination is occupied by nobody or by at least two participants, since coins are only concealed by other coins of the same size on the same side. A session that attracts a lone promotion or demotion participant and no counterpart therefore waits, and expires in the queue stage without charging anyone's collateral, rather than publishing a transaction that would identify that participant's coins. Because admission relies on the declared directions, a participant whose entry deviates from what it declared has its collateral consumed. (#7052)

Wallet

  • CoinJoin can now promote and demote between adjacent standard denominations within a mixing session after V24 activation. Promotion combines 10 inputs of one denomination into 1 output of the next larger denomination, while demotion splits 1 input into 10 outputs of the next smaller denomination. Pre-V24 behavior remains unchanged. (#7052)

  • Conversions only spend fully-mixed coins, and their outputs start mixing over from zero rounds. The 10:1 shape of a conversion publicly clusters one participant's coins even inside a mixing transaction, so a converted coin is not treated as mixed: it re-enters mixing at its new denomination and disperses normally, while the histories of the fully-mixed coins that fed the conversion remain protected. (#7052)