XCM as a Standard for Reading And Interacting with Parachains

[xlc]

I already have proposals to solve the query issue on different context:

Onchain:

Interchain Proof Oracle Network

Background XCM provides a trustless way for relay/parachains to dispatch messages to each other. However, there is another common use case that’s not fully addressed by XCM, which is the ability to trustlessly read onchain state from another chain. While it is possible to create a protocol on top of XCM to allow chains to publish their onchain states, it may not necessary be the best way due to overheads of XCM. Especially at this stage we are still using XCM-lite that all the messages consume…

Offchain:

Wasm view functions

Background In Solidity, contract developers can create view functions for their contract to help clients to access contract state. In Substrate, we have runtime APIs that achieve similar goal. That’s totally useable and a good enough solution. However, it still have a lot of room for improvement. One of the nice property of the Solidity view function is that the same getter can be used for both contract logic and front-end and that reduces a lot of duplicated codes. For example, a rebase toke…