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With the blockchain, you gain access to two things. On one hand, you could select only the pertinent information required for that transaction-and entering a bar through a bouncer is a transaction. In this case: name, picture, and age. On the other hand, the bouncer can rest easy knowing that once something is hashed into the blockchain, it can’t be changed; new information can only be appended and there is a transparent record of all changes.
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