How to determine whether a principal is a canister

Developers
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How to determine whether the principal is a canister or an identity account

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“ and there is intentionally no mechanism to tell canister ids and user ids apart”

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How to get canisters code

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you can not get the canister code,but you can get the candid on ic.rocks through the canisterId

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How to get the interfaces of canisters

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If it’s a Motoko canister you can search by canister id here to get the interface: https://k7gat-daaaa-aaaae-qaahq-cai.ic0.app

If it’s not available there you check the project GitHub repo or contact the developer (maybe also ask them to serve the candid from their canister or create a listing above).

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the dfinity UI candid canister also work,just put the canister ID and you will get the candid