http://git-coin.herokuapp.com/gitcoins

GitCoin is a simplistic bitcoin simulator which uses SHA1 Digests of user-supplied "commit messages" to calculate a current hash target.

To be awarded gitcoins, users must submit new commit messages which generate SHA digests smaller than the current target hash.

To compare the numeric value of your digest with the target (or any other hash), use String#hex (in Ruby, or the equivalent in your language) EG:

> "1f6ccd2be75f1cc94a22a773eea8f8aeb5c68217".hex < "75e2575535d998d7cfb6b627ffc60550c1e23301".hex
=> true

Use Digest::SHA1.hexdigest to evaluate the digest value of a given string, e.g.:

require 'digest'
Digest::SHA1.hexdigest("my-string")

GET /target

This will render the current hash target as text. To be awarded a gitcoin, your commit messages must digest to a value smaller than this target.

GET /gitcoins

See a list of all the previously awarded gitcoins.

POST /hash

Attempt to generate a gitcoin by supplying a message which will be Digested and compared against the current hash target. If your message generates a lower hash, you will get a coin!

param: owner -- the name of the owner to whom the gitcoin will be awarded (make sure you submit your name here in order to get credit for your gitcoins)

param: message -- The message from which you are trying to generate a gitcoin.

example cUrl command:

curl -v -X POST "git-coin.herokuapp.com/hash?message=2015-01-21+16%3A27%3A54+-0700&owner=worace"

Inspiration for this project came from the Stripe CTF3 challenge, which included gitcoins as one its levels.