[erkancamli]

UserOperation.toInitCode always replaces a 0x7702 factory with the authorization's delegate address:

if (!authorization) return '0x7702000000000000000000000000000000000000'
const delegation = authorization.address
return Hex.concat(delegation, factoryData ?? '0x')

and toPacked uses it for the packed user operation, the form the AA guide passes to the EntryPoint. EntryPoint 0.8 and 0.9 (Eip7702Support) only treat an operation as EIP-7702 when the first 20 bytes of initCode equal bytes20(0x7702), the marker padded with zeros; the delegate address is substituted only for hashing, in _getEip7702InitCodeHashOverride. With the delegate in initCode, the operation is not recognised as 7702: on 0.8 handleOps reverts with AA10 sender already constructed (the delegated sender already has code), and on 0.9 the init code is ignored, so factoryData never runs. The hash is unaffected, so the signature still verifies and nothing fails until the op is on chain. fromPacked(toPacked(op)).factory also comes back as the delegate rather than 0x7702.

viem fixed the same thing in 892ebea1 by giving getInitCode a forHash option. ox already has forHash on toPacked, but it only reaches the paymaster signature.

This adds forHash to toInitCode:

• default: the 20-byte 0x7702 marker followed by factoryData (the short '0x7702' form is padded too, so the EntryPoint check matches);
• forHash: true: the delegate form used for hashing, as today.

toPacked passes its forHash on, so hash (which packs with forHash: true) gives the same 0.8 and 0.9 hashes as before, matching viem.

Tests: toPacked > eip7702 covers the default packed initCode and the round trip through fromPacked, plus the forHash form; the existing delegate-form toInitCode cases now pass { forHash: true }. On main the new default cases fail with the delegate address in place of the marker; with this change the src/erc4337 tests pass. vp check is clean on the changed files. A changeset is included.

Note that this changes the default output of the public toInitCode for EIP-7702 operations, the same change viem made for getInitCode.

[vercel]

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[jxom]

Thanks @erkancamli, the fix is correct. Superseded by #593 (main, which keeps your commit) and #594 (0.x backport), with small follow-ups to the changeset and tests.