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Title: What will happen if a block hash= trans hash? Post by: girlbtc.com on December 08, 2016, 08:35:06 AM 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 :) Title: Re: What will happen if a block hash= trans hash? Post by: ranochigo on December 08, 2016, 09:07:29 AM When you search the hash in blockchain.info 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 Title: Re: What will happen if a block hash= trans hash? Post by: btc_enigma on December 09, 2016, 05:53:27 AM Its very rare for two random strings to have same hash
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