Hierarchy for Colored Voting Pool Deterministic Multisig Wallets.

Proposed a key layout for 'voting pool' shared wallets that handle coloured coins, giving each colour its own keys.

It is the coloured-coin companion to BIP 80. Each 'colour definition' is shortened with a hash and split across five levels of the key tree, so one seed can handle many colours. Keys at the last level build the shared deposit addresses the pool's members have agreed on.