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lambdaclass
ethlambda
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feat(validator): durable EIP-3076 slashing protection
- #734
#734
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Nov 6, 2026
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feat(validator): durable EIP-3076 slashing protection
#734
MegaRedHand
merged 15 commits into
main
lambdaclass/ethlambda:main
from
feat/validator-slashing-protection
lambdaclass/ethlambda:feat/validator-slashing-protection
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Commits on Nov 4, 2026
Make the validator client's slashing protection durable: every block and attestation is checked against a per-validator record of EIP-3076 minimal watermarks (highest block slot, highest attestatio…
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Address review of the durable slashing protection. Keys registered without history (--init-slashing-protection, keymanager imports) now start at the current slot and epoch instead of as never havin…
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Apply the bot reviews of the durable slashing protection. The durable write creates its temporary file fresh with create_new at mode 0600, removing whatever was at that path first, so a leftover of…
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Register keys with no slashing-protection history as never having signed again, dropping the seeding at the current slot and epoch: it only covered messages signed elsewhere up to this node's clock…
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Roll a keymanager import back when its slashing-protection registration fails: the keys this request added are taken out of the definitions file and their keystore and password files removed, so th…
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Put SlashingProtection::in_memory behind a test-utils feature: it treats every unknown key as registered and persists nothing, which no production caller should be able to reach. The rpc crate's te…
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Refuse attestation data whose source epoch is at or past its target outside genesis, so a beacon node cannot talk the client into recording a source the chain has not justified, which the durable r…
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Lock the validators directory itself rather than a lock file beside the record: flock follows the inode, so deleting slashing_protection.lock let a second process lock a fresh file and sign with th…
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Close the gaps the second automated review round found in the slashing protection. The attestation-data check refuses a source at or past its target whenever the source is not zero, so a source pas…
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Settle what an unflushed write means for each file, bound the wait for the record, and lock the directory before the keys are read. ValidatorDefinitions::save now reports an after-rename flush fail…
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Read the record with the same rule it is written under, put a failed import's files back as they were, probe the directory flush at startup, and make a retried delete flush what an earlier one coul…
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Say what an Err from a record write means for the watermarks: nothing changed, except after a rename whose directory flush failed, where the slot or target is on disk and in memory and a retry is r…
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Correct the attestation duty's comment on a failed record write to match the record's contract: nothing may be signed, and nothing was recorded except after a rename whose directory flush failed, w…
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Undo a failed import newest snapshot first, so a key listed twice in one request ends with what was there before the request rather than with what its first copy wrote; a test imports the same keys…
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Refuse a keymanager import that carries slashing_protection, importing none of its keys: until history can be imported, a 200 with imported would tell the caller the history it handed over was take…
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