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Compressed clvm
Richard Kiss edited this page Dec 24, 2024
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CLVM compression works roughly like this:
- Given a clvm tree, calculate the sha256tree hash for each node.
- Start to serialize.
- At each node to be serialized, check to see if it's been serialized by looking at the sha256tree cache.
- If in the cache, check to see if it's shorter to serialize by memoizing. If the regular serialization is longer than a few bytes, memoizing is usually better. Write a
0xfe
byte followed by a path in the partial-serialization tree to the previously serialized clvm. - Otherwise, serialize the old way.
- Repeat until done.
Implementation:
https://github.com/Chia-Network/clvm_rs/blob/main/src/serde/ser_br.rs#L28
See also https://gist.github.com/richardkiss/86f8ba4a04f4eb6b44234f014daa3d31
See also https://gist.github.com/richardkiss/61ad9a63050b6fa64caea6ea82033a66