Add universal signature verification (ERC-1271 + ERC-6492)#266
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Add Ethers.Signature with verify_hash/4, verify_message/4 and
verify_typed_data/4, verifying any signature kind against an address:
- Plain EOA ECDSA signatures verify locally via ecrecover with no RPC
round-trip (fast path).
- ERC-1271 smart-contract wallet signatures and ERC-6492-wrapped
signatures from counterfactual (not-yet-deployed) wallets verify with
a single deployless eth_call executing the ERC-6492
UniversalSigValidator reference contract (bytecode vendored from
viem / Ambire signature-validator, shipped as a constant in
Ethers.Contracts.UniversalSigValidator — nothing is deployed).
Invalid signatures return {:ok, false}; {:error, reason} is reserved for
malformed input and RPC transport failures, so there are deliberately no
bang variants.
Tested against anvil with a minimal ERC-1271 wallet fixture and a
CREATE2 factory fixture covering deployed-wallet and counterfactual
(ERC-6492) verification, plus EOA fast-path tests proving no RPC usage.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Second PR of the v0.7 "Auth" tier. Stacked on #265 (base is
feat/eip-191-personal-message; retarget tomainafter #265 merges).What
Ethers.Signaturemodule:verify_hash/4,verify_message/4(EIP-191),verify_typed_data/4(EIP-712) — verifies any signature: EOA ecrecover, ERC-1271 smart-contract wallets, and ERC-6492-wrapped signatures from counterfactual (not-yet-deployed) wallets.{:ok, true}with zero RPC calls. Everything else goes through one deploylesseth_callof the ERC-6492UniversalSigValidator(creation code as call data, noto).lib/ethers/contracts/universal_sig_validator.exholds the validator creation bytecode (sourced from viem'serc6492SignatureValidatorByteCode, i.e. Ambire's ERC-6492 referenceValidateSigOffchain; provenance documented).{:ok, false}for invalid signatures (incl. validator reverts on malformed input);{:error, reason}only for transport failures. No bang variants — they would conflatefalsewith errors.Testing
Ethers.Signatureincl. all branches.mix format,mix credo --strict,mix dialyzerclean.🤖 Generated with Claude Code