Support for storage value proof verification

[ERussel]

polkadot/api has a function to retrieve a proof for storage value given corresponding key. But is there a library that allows to verify received proof against Merkle root?

Our research shows that we need proper implementation of the trie-db. We tried to use one from polkadot/common 1.8.1 but looks like it is outdated (for example, NibbledBrachNode type is missing for Trie node). The only option we see now is to port Rust implementation of the proof verification that looks very complicated but may be there is an easier way?

[jacogr]

The trie-hash is indeed very outdated, it has not kept up with the latest changes. (It has moved code locations, here is the PR with the latest code that was in common https://github.com/polkadot-js/client/pull/250/files). I'm assuming the @polkadot/trie-hash should actually be sufficient for this usage, but yes, it is seriously outdated compared to Rust master.

I cannot think of another way. I guess without porting if the trie-root can be compiled to WASM (it is certainly compatible since it is used in Substrate), it would be the best solution from a compatibility perspective.

[polkadot-js-bot]

This issue has been open for 21 days with no activity and is not labelled as an enhancement. It will be closed in 7 days.

[polkadot-js-bot]

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