docs: TIP-1018 — Cross-Chain Deterministic Address Derivation#2751
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docs: TIP-1018 — Cross-Chain Deterministic Address Derivation#2751
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Amp-Thread-ID: https://ampcode.com/threads/T-019c6e4f-32f7-73ce-a979-6f3ada33ade2 Co-authored-by: Amp <amp@ampcode.com>
gakonst
requested review from
0xKitsune,
dankrad,
danrobinson,
howydev and
legion2002
as code owners
- derive_v2_address: CREATE2-based address from passkey coords + index - derive_v2_address_default: convenience wrapper with protocol constants - recover_p256_address: disambiguates v1/v2 via from_hint - Constants: CROSS_CHAIN_ACCOUNT_FACTORY_ADDRESS, CROSS_CHAIN_ACCOUNT_INIT_CODE_HASH (placeholders) - 10 unit tests covering determinism, index variation, factory/initCode sensitivity, CREATE2 spec compliance, and v1/v2 disambiguation
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Summary
TIP for modifying P256/WebAuthn address derivation to use CREATE2-compatible addresses, enabling cross-chain fund recovery.
Motivation
Users send funds to their Tempo address on other chains (Base, Ethereum) and lose them permanently. Current derivation
keccak256(pubKeyX || pubKeyY)[12:]has no meaning on other chains.Design
salt = keccak256(pubKeyX, pubKeyY, index), identical address on all EVM chainsEdge Cases Covered
Context
Supersedes: #2451 (ref impl)
Prompted by: georgios