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Is it possible to either check the return value of the entrypoint interaction or read a big_map of B's You cannot do that both on-chain and without the collaboration of contract B. Can you please explain in more details your scenario? If you don't trust contract B you should probably not interact with it.


You cannot read other contract's data directly. Currently, Tezos only supports a callback pattern. You can send a callback to another contract, and then the contract calls you back with a response. This template should give you an idea: Only next proposal (Hangzhou) will allow synchronous calls (on-chain views): ...

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