The Cosmos SDK team are planning to replace their use of IAVL with https://github.com/lazyledger/smt but need to make breaking changes to KVStore, namely SMT does not support iteration over keys
https://github.com/silasdavis/trieste could still be an option, but needs work. If we want to have a defined 'file format' storage scheme (based on something like capnproto/flatbuffers) then it might be useful to own this layer.
IAVL lacks a maintainer and has fundamental performance issues (see https://github.com/cosmos/cosmos-sdk/discussions/829 and https://github.com/cosmos/cosmos-sdk/issues/7100)
The Cosmos SDK team are planning to replace their use of IAVL with https://github.com/lazyledger/smt but need to make breaking changes to KVStore, namely SMT does not support iteration over keys
https://github.com/silasdavis/trieste could still be an option, but needs work. If we want to have a defined 'file format' storage scheme (based on something like capnproto/flatbuffers) then it might be useful to own this layer.