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cosmos-sdk/x/ibc-transfer/spec/01_concepts.md

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Concepts

Acknowledgements

ICS20 uses the recommended acknowledgement format as specified by ICS 04.

A successful receive of a transfer packet will result in a Result Acknowledgement being written with the value []byte(byte(1)) in the Response field.

An unsuccessful receive of a transfer packet will result in an Error Acknowledgement being written with the error message in the Response field.