danj3 / elixir-hashcash

hashcash proof-of-work implementation

Hashcash

Elixir implementation of the hashcash algorigthm as described in http://hashcash.org and https://en.wikipedia.org/wiki/Hashcash

Based loosely on https://github.com/grempe/hashcash.git

Usage

The tests are a more complete set of examples, however:

Import a hashcash stamp

stamp = Hashcash.stamp(stamp_string)

Verify a stamp

case Hashcash.verify(stamp,"[e-mail]") do
{:ok, :verified } -> :yay
{:error, :unproven} -> :work_didnt_happen
{:error, :resource_mismatch} -> :valid_resource_didnt_match
{:error, :resource_expired} -> :time_stamp_is_too_old  # 2 days
end

Installation

Available in Hex.

The package can be added to your project:

1. Add `hashcash` to your list of dependencies in `mix.exs`:

```elixir
def deps do
  [{:hashcash, "~> 1.0"}]
end
```