The way hashcash poses a challenge is by asking "minters" to produce strings ( stamps) that when hashed with the Secure Hash Algorithm, SHA-1, have a number of leading zeros in their hash. hashcash提出质询的方式是,当通过安全散列算法(SecureHashAlgorithm)进行散列时,要求“minters”生成一个字符串(戳记,stamps),在它们的散列中有很多前导零。