feat: Pollard and partial forest support#56
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Davidson-Souza merged 2 commits intomit-dci:mainfrom Dec 3, 2024
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What we call Pollard is just the full forest with all leaves in it. A Pollard should give the option to only cache a subset of the leaves in the accumulator. This commit simply creates a new mod called MemForest where the old code will live.
Partial pollards allow you to hold only a subset of utxos in the forest, effectively caching them and not requiring to download or validate extra proofs for it. This commit implements it using a very similar approach as the main forest, but with the possibility to prune leaves that you don't want to hold anymore.
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Pollard is an efficient implementation of the accumulator for keeping track of a subset of the whole tree. Instead of storing a proof for some leaves, it is more efficient to hold them in a tree structure, and add/remove elements as needed. The main use-case for a Pollard is to keep track of unconfirmed transactions' proof, in the mempool. As you get new transactions through the p2p network, you check the proofs and add them to the Pollard. When a block is mined, we can remove the confirmed transactions from the Pollard, and keep the unconfirmed ones. We can also serve proofs for specific transactions as requested, allowing efficient transaction relay.