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Usage: `mina-indexer blocks compare state_hash1 state_hash2` Result: returns the "better" state hash
https://docs.rs/rocksdb/latest/rocksdb/struct.DBCommon.html#method.multi_get
https://docs.rs/rocksdb/latest/rocksdb/struct.DBCommon.html#method.get_pinned_cf
https://docs.rs/rocksdb/latest/rocksdb/struct.ReadOptions.html#method.set_async_io
We get username updates from [special user commands](https://docs.minaexplorer.com/minaexplorer/explorer-name-service) sent to a specific address (ME Name Service address). Do we want to use another address besides the ME Name Service address?