Attest
Leave a permanent public note that links your old key to your new account.
The note is append-only and moves no funds. If Ethereum later adds a recovery path that asks for this kind of pre-commitment, yours is already on record.
WHY_THIS_MATTERS[ NOTICE ]
The attestation contract is not configured in this build.
[ NOTICE ]
Connect the key that still controls the funds.
[ WRITE_A_RECORD ]
[ APPEND_ONLY_LOG ]
Connect a key to read its records.