NUT-XX: Bitcoin External Fee - #420
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Summary
Adds NUT-XX: Bitcoin External Fee, a new NUT-10 spending-condition kind (
BTCFEE) that lets a sender lock eCashProofsto whichever party successfully mines a specific Bitcoin transaction into a block.How it works
Secret(kindBTCFEE) commits to the raw transaction (data) plus optional tags: requiredconfirmations, a refundlocktime, and therefundpubkey.scriptSig, and a Merkle proof that the transaction is included in that block's Merkle tree.locktimeexpires, the original sender can reclaim the proof via a NUT-11 refund.