Hashcash

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version:claimedBits:timestamp:resource:extension:randomValue:counter

1:20:040806:foo::65f460d0726f420d:13a6b8
1:20:210216:test@abc.com::91b93a6c71b9783e:bd7483b9a210110

echo -n 1:20:210216:test@abc.com::91b93a6c71b9783e:bd7483b9a210110 | sha1sum

000009a30631d8004be47081cad6b089a2379288
  • version : Hashcash version
  • claimedBits : Number of leading zero bits in the stamp
  • timestamp : Timestamp in format YYMMDD
  • resource : Content of stamp
  • counter : This is incremented to find a partial collision

References