Hu?
Multisig wallets a la greenaddress, copay, Hardwarewallets a la trezor, hw1, coincase...oder per electrum master seed a la Monero?
Gibt doch genug sinnvolle und einfache Möglichkeiten bereits.
Hier eine Zusammenfassung:
https://bitcointalk.org/index.php?topic=858604.0I propose a protocol extension whereby you can sign a specific Darkcoin address, requiring the second level of validation. This will propagate across the network and all clients will require the code to process any future transactions from this address. Money can go into these protected addresses freely, however, to move out they will require this code.
P2SH?!?!?!?
https://en.bitcoin.it/wiki/Pay_to_script_hash (AKA MULTISIG wie es copay und co benutzen).
Ich sag lieber nichts.