Topic: What will happen if a block hash= trans hash? (Read 380 times)
Its very rare for two random strings to have same hash
When you search the hash in blockchain.info
It will give you Error? or Both?
To my knowledge, this is very very rare and I believe its close to impossible. I need clarifications on this however, can someone else help to answer this question?It will give you Error? or Both?
And same question , what if two trans has same hash? will it be confused by the bitcoin-core or the miners.
This has happened before. We need to understand how transaction hash works to know how it is impossible now.A transaction hash consist of a double SHA256 hash of the following (in order):
1. A 32-bit version number.
2. inputs used in the transaction
3. outputs and the criteria for spending it
4. 32-bit nlocktime
So, for the transaction IDs to be identical, they must have the exact of the above.
This is only possible if a collision is found or in coinbase transactions(used to be easy).
BIP30 solved the coinbase TXID conflict implications by preventing miners from including any TX that has the same TXID from a previous block and has outputs unspent.[1] BIP34 makes the duplicate coinbase transactions even harder to create by adding block number into coinbase.
[1] https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki
When you search the hash in blockchain.info
It will give you Error? or Both?
And same question , what if two trans has same hash? will it be confused by the bitcoin-core or the miners.
For example:
The hash of Trans A and Trans B is the same.
You have valid output in trans A,
But the bitcoin-core find the Trans B and judge you as invalid
It will give you Error? or Both?
And same question , what if two trans has same hash? will it be confused by the bitcoin-core or the miners.
For example:
The hash of Trans A and Trans B is the same.
You have valid output in trans A,
But the bitcoin-core find the Trans B and judge you as invalid
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