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https://www.btcstudy.org/2021/10/26/bitcoin-is-an-idea-by-Gigi/#RPOW%EF%BC%9A%E5%8F%AF%E9%87%8D%E5%A4%8D%E4%BD%BF%E7%94%A8%E7%9A%84%E5%B7%A5%E4%BD%9C%E9%87%8F%E8%AF%81%E6%98%8E-Hal-Finney-2004