We introduce a simple yet universal delegation mechanism, an alternative to the script-level delegation we have developed.
Let us say Alice wants to delegate her UTXO to Bob. She creates a transaction of two inputs: one spending her UTXO and the other spending Bob’s UTXO. She signs her input using sighash flag SIGHASH_NONE, meaning all outputs of the transaction can be malleated. She hands the partially signed transaction to Bob. Bob can sign the second input and send Alice’s coins to whatever outputs he wants. Essentially, Alice has delegated her UTXO to Bob.
Bob’s UTXO can come from an existing UTXO controlled by Bob. If no such UTXO exists, Alice can simply create one and deposit minimal dust-level bitcoins into it.
Original idea comes from this post in the bitcoin-dev mailing list.
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