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BTC. Secondly, Alice disclose AliceKey[5]. Using this key, Bob can build HEBR1a by himself. In the same way, Bob disclose BobKey[4] and BobKey[5] to Alice. 16. Spend C2b Bob unexpectedly broadcast C2b. Unfortunately, he lose all BTC for his breach. // Sign by himself(Bob) C2b = signTx(C2b,