A backend flat file DB (hashcash.db) needs to be installed to keep track of Hashcash tokens created when submitting the note to prevent double spending. See http://hashcash.org/docs/hashcash.html#double_spending_protection. Default expiry of the tokens should be the same as the default expiry of the note, which will likely be the recommendation of 28 days, after which the token will be considered invalid.
atoponce
commented
10 years ago
A backend flat file DB (hashcash.db) needs to be installed to keep track of Hashcash tokens created when submitting the note to prevent double spending. See http://hashcash.org/docs/hashcash.html#double_spending_protection. Default expiry of the tokens should be the same as the default expiry of the note, which will likely be the recommendation of 28 days, after which the token will be considered invalid.