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BIP8: allow some MUST_SIGNAL blocks to not signal

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Using the same threshold for MUST_SIGNAL as STARTED means that any chain
that would have resulted in activation with lockinontimeout=false will
also result in activation with lockinontimeout=true (and vice-versa).
This reduces the ways in which a consensus split can occur, and avoids
a way in which miners could attempt to discourage users from setting
lockinontimeout=true.
This commit is contained in:
Anthony Towns 2020-10-17 18:18:27 +10:00
parent 9a119ce46a
commit afe97b2eee
1 changed files with 16 additions and 4 deletions
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bip-0008.mediawiki
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@ -83,7 +83,7 @@ Miners should continue setting the bit in LOCKED_IN phase so uptake is visible,
The new consensus rules for each soft fork are enforced for each block that has ACTIVE state.
During the MUST_SIGNAL phase, blocks that fail to signal are invalid.
During the MUST_SIGNAL phase, if '''(2016 - threshold)''' blocks in the retarget period have already failed to signal, any further blocks that fail to signal are invalid.
===State transitions===
@ -175,11 +175,23 @@ block, indexed by its parent.
===Mandatory signalling===
Blocks received while in the MUST_SIGNAL phase must be checked to ensure that they signal. For example:
Blocks received while in the MUST_SIGNAL phase must be checked to ensure that they signal as required. For example:
if (GetStateForBlock(block) == MUST_SIGNAL) {
if ((block.nVersion & 0xE0000000) != 0x20000000 || ((block.nVersion >> bit) & 1) != 1) {
return state.Invalid(BlockValidationResult::RECENT_CONSENSUS_CHANGE, "bad-version-bip8-must-signal");
int nonsignal = 0;
int count = 1 + (block.nHeight % 2016);
walk = block;
while (count > 0) {
--count;
if ((walk.nVersion & 0xE0000000) != 0x20000000 || ((walk.nVersion >> bit) & 1) != 1) {
++nonsignal;
if (nonsignal + threshold > 2016) {
return state.Invalid(BlockValidationResult::RECENT_CONSENSUS_CHANGE, "bad-version-bip8-must-signal");
}
} else if (nonsignal == 0) {
break;
}
walk = walk.parent;
}
}