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Safer Noinput With Output Tagging
Regarding NOINPUT, there was a proposal that would try to mitigate the risk of accidental double payment, as NOINPUT brings Bitcoin smarter contracts, these contracts can also be abused or used in a dumber way, the proposal here is that a certain bit will be used as a flag to let wallets know that this transaction can be spent with NOINPUT, the tag must be explicitly made by the payer and can have one of two implementations, the first would be a bit in the tx version, the second would be a bit in the scriptPubKey.