and those unit test changes helped me find some bugs

so good

but the bugs are in what I changed, not the original snowblossom code, also good

*https://github.com/snowblossomcoin/snowblossom/compare/8650584e6075...3f55cf7a714a* https://github.com/snowblossomcoin/snowblossom/commit/3f55cf7a714a7de7a116a5ba791091cdfc293958 - Make HashedTrie support variable length keys for Channels file storage