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add WithUniqueTopic wrapper in Trappist and Stout xcm routers #345

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@XY-Wang XY-Wang commented Apr 23, 2024

This PR adds the WithUniqueTopic wrapper, introduced in paritytech/polkadot#7234, to the Trappist and Stout XCM routers to ensure that all XCMs are appended with a SetTopic instruction.

This will allow for easier tracking of XCM, especially in the case of multi-hop messages where the message hash differs on each leg.

More detailed explanation: https://substrate.stackexchange.com/questions/1893/is-there-an-id-for-xcm-message/1906#1906

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