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In one byte: you can encode up to 2 8 values (i.e. 256 values). When a transaction hash is encoded in a byte[243] , only 3 values within the 256 possibilities are effectively used in each byte. This representation encodes one trit per byte. When a transaction hash is encoded in a byte[49] : 243 values within the 256 possibilities are used in each byte. ...


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Broadcast a tx/Request a missing tx When IRI broadcast a transaction to neighbors, it can append to the transaction data the hash of a transaction to request (i.e. the hash of a transaction unknown by the broadcaster), or the NULL_HASH if the broadcaster don't have any transaction to request. Basically, when IRI broadcast a tx, the packet will look like ...


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