Payment Lifecycle 支付生命週期

Payment Lifecycle

1. Invoice Creation (Receiver):
preimage = random(32)
payment_hash = SHA256(preimage)
payment_secret = random(32)
invoice = encode(hash, secret, amount, expiry)

2. Route Discovery (Sender):
decode(invoice)
paths = dijkstra(graph, source, destination, amount)
best_path = select_best(paths)

3. HTLC Forwarding:
Alice --HTLC--> Bob --HTLC--> Carol --HTLC--> Dave
每跳：update_add_htlc + commitment_signed

4. Settlement (Preimage Reveal):
Dave 驗證 hash/secret -> 揭露 preimage
Dave -> Carol -> Bob -> Alice: update_fulfill_htlc
支付完成！