Write proposal for merkle-based hash scheme

[pgebheim]

Description

An ongoing conversation is to use a merkle trie to represent the set of allow-listed hashes within the ledger app. This task represents the work of producing that proposal and getting it reviewed.

[bluesign]

What is the justification for using Merkle tree instead of signed payload ?

[pgebheim]

Merkle trie is a way to quickly scale out the allow list for approved transactions. This was discussed before the signed templates idea was formed.

[bluesign]

@pgebheim sorry, sometimes I have this bug of double complaining on a subject, when it takes long time :) cache invalidation is hard. ( forgetting I complained before )