Decaying MultiSig using nLockTime
A decaying MultiSig that requires no bitcoin script other than regular MultiSigs.
A 3-of-3 that decays into a 2-of-3 at block height
Alice, Bob, and Carol create a 3-of-3 regular MultiSig output.
Alice signs the output with
nLocktime = xand
She sends this partially signed TX to Bob and Carol.