* cryptarchia: introduce Hash class
* cryptarchia: Coin renamed to Note
* cryptarchia: simplify mock leader proof
* cryptarchia: remove orphan proofs from block headers
* cryptarchia: maintain a single commitment set in ledger state
* cryptarchia: drop note evolution
* cryptarchia: drop MOCK_LEADER_VRF
* cryptarchia fix nonce contribution derivation
* cryptarchia: mk_chain only returns list now
* fixup
* cryptarchia: shorten test cases using mk_chain