Blockchain is...?

Hey devs, how would you describe blockchain in one sentence. Finish this line:

Blockchain is...?

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A huge excel sheet distributed across multiple machines, and to write something into it you must input valid data that can be verified by these machines.

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an extended version of git

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...just a glorified "Linked List"!!!

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Blockchain is a series of certificates of summarised information tied together by an imaginary string, and each certificate on the string has a cryptogram that contains every certificate on the string that came before itself - anyone can put a certificate on the string, but no one can replace or modify a certificate that is already on the string; and everybody has equal ownership of the string.

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