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For instance, the following header represents about 252 hash computations to send a message to
[email protected] on January 19, 2038: X-Hashcash: 1:52:380119:
[email protected]:::9B760005E92F0DAE It is verified with a single computation by checking that the SHA-1 hash of the stamp (omit the header name X-Hashcash: including the colon and any amount of whitespace following it up to the digit '1') begins with 52 binary zeros, that is
13 hexadecimal zeros:...