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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? Commented May 19, 2018 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.
    – Ava Chow
    Commented May 19, 2018 at 2:17

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