Shaw one was developed in a competition by the nsa. Essentially what shaw two 56 is is a pseudo random signature generator. If you change any part of these transactions it doesn't work any more, that's for the current block. Hashing is great way of protecting ledger, because every new set of transactions is strung together with every transaction that's ever happened without everyone noticing. Cryptography and hashing help provide the security we need in decentralized system.

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