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    Type Alias HrmpChannelDigests

    HrmpChannelDigests: StorageDescriptor<
        [Key: number],
        [number, number[]][],
        false,
        never,
    >

    Maintains a mapping that can be used to answer the question: What paras sent a message at the given block number for a given receiver. Invariants:

    • The inner Vec<ParaId> is never empty.
    • The inner Vec<ParaId> cannot store two same ParaId.
    • The outer vector is sorted ascending by block number and cannot store two items with the same block number.

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