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chore: add TieredSmt to readme

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Bobbin Threadbare 2023-05-26 14:41:22 -07:00
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CHANGELOG.md
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## 0.5.0 (2023-05-26)
* Implemented `TieredSmt` (#152, #153).
* Implemented ability to extract a subset of a `MerkleStore` (#151).
* Cleaned up `SimpleSmt` interface (#149).

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README.md
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[Merkle module](./src/merkle/) provides a set of data structures related to Merkle trees. All these data structures are implemented using the RPO hash function described above. The data structures are:
* `MerkleTree`: a regular fully-balanced binary Merkle tree. The depth of this tree can be at most 64.
* `SimpleSmt`: a Sparse Merkle Tree, mapping 64-bit keys to 4-element leaf values.
* `MerklePathSet`: a collection of Merkle authentication paths all resolving to the same root. The length of the paths can be at most 64.
* `MerkleStore`: a collection of Merkle trees of different heights designed to efficiently store trees with common subtrees.
* `Mmr`: a Merkle mountain range structure designed to function as an append-only log.
* `SimpleSmt`: a Sparse Merkle Tree (with no compaction), mapping 64-bit keys to 4-element values.
* `TieredSmt`: a Sparse Merkle tree (with compaction), mapping 4-element keys to 4-element values.
The module also contains additional supporting components such as `NodeIndex`, `MerklePath`, and `MerkleError` to assist with tree indexation, opening proofs, and reporting inconsistent arguments/state.
## Extra
[Root module](./src/lib.rs) provides a set of constants, types, aliases, and utils required to use the primitives of this library.
## Crate features
This crate can be compiled with the following features: