How to prove authorship of a transaction
Note: Transaction authorship does not prove you paid a certain amount to a certain address. For that, see prove payment.
Go to the History tab. Right click on the transaction you want to prove authorship of → Create tx proof. Select “Prove authorship of a transaction (SpendProof)”.
You may enter an optional message in the Message textbox to be included in the proof.
To export your proof as a PGP-like message, click Get Formatted Proof. Note that only Feather Wallet currently supports this format.
To get the proof signature manually, click Get Signature.