Class description
An hashcash object. An hashcash have the following slots:
versionThe version number. Only version 1 is supported.
bitsThe claimed bit value.
dateThe date a stamp was minted.
resourceThe resource for which a stamp is minted.
extExtensions that a specialized application may want.
saltA random salt.
suffixThe computed suffix. This is supposed to be manipulated by the library.


TUPLE: hashcash version bits date resource ext salt suffix ;