Sylvain Bellemare

Introduce explicit model for the "circuit definition"

4

**NOTE**: _This issue is Work In Progress_. Quoting the [Internet Draft](https://tools.ietf.org/html/draft-thomas-crypto-conditions-03#section-1) (Introduction, second paragraph): > The validation function for these compound signatures takes as input **the fingerprint of the circuit,...

Make sure implementation matches version 03 of the draft

1

The only change, if not mistaken, is: > The list MUST be ordered by the type id value of each type, in ascending order. i.e. preimage-sha-256 MUST appear before prefix-sha-256....

https://www.python.org/dev/peps/pep-3102/

To be consistent with `Ed25519Sha256`

Update to version 02 of the draft specification

2

draft is at https://tools.ietf.org/html/draft-thomas-crypto-conditions-02 - [x] part of this work should incorporate the test vectors documented at https://github.com/rfcs/crypto-conditions#test-vectors Some details to double check for: - [ ] URI normalization: see...

For convenience purposes.

We want the following to work: ```python import cryptoconditions cryptoconditions.__version__ ```

From @r-marques in https://github.com/bigchaindb/cryptoconditions/pull/67#issuecomment-310113354 > The crypto module does not seem to be used by cryptoconditions anymore. BigchainDB probably still uses it. Ideally we would move the code we need...