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Can you go backwards in a block chain to unhash an old ledger and see the transaction details?

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There seems to be a fundamental misunderstanding of how blockchains work. There is no hashing and hiding of transactions. Transactions are identified by their hashes and the hash is stored in a block, along with the transaction. There is no need for "unhashing" to see transaction details, the details are all there.

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  • Sorry, I thought that each block/ledger was hashed after a certain number of transactions, and that hash then became line1 of the next block. So, is the entire chain of blocks pushed along from genesis to today? – Glenfiddich May 19 '18 at 1:51
  • Yes, the entire blockchain (which is the collection of all blocks) is publicly available and stored by full nodes. Furthermore, all blocks are verified by all full nodes. – Andrew Chow May 19 '18 at 2:17

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