DUAL-KEY INHERITANCE PATTERN
OP_IF
<primary_key> OP_CHECKSIG
OP_ELSE
<locktime> OP_CLTV OP_DROP
<backup_key> OP_CHECKSIG
OP_ENDIF
Primary key spends normally. After the timelock, a second key activates — enabling on-chain inheritance without a trusted third party.
— patterns detected on mainnet