<p>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.</p>

CC BY-SA 4.0
2018-05-19T01:51:29.667Z
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
CC BY-SA 4.0
2018-05-19T02:17:03.797Z
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
CC BY-SA 4.0
2018-05-17T23:38:38.900Z
2018-05-17T23:38:38.900Z
Ava Chow
<p>Can you go backwards in a block chain to unhash an old ledger and see the transaction details?</p>

<blockchain>
Can you go backwards in a block chain?
Glenfiddich
# Can you go backwards in a block chain?

(Asked by: username_0 on 2018-05-17)

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

**Tags:** blockchain


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## 1 answers

### Answer by username_1 on 2018-05-17. Score: 6

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.

> **Comments:**
> **username_0**: 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?  
> **username_1**: 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.  

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