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Can TXID be caculated before TX commited?
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Topic: Can TXID be caculated before TX commited? (Read 1000 times)
wangsw
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Can TXID be caculated before TX commited?
May 18, 2013, 03:17:51 AM
#1
Hello all!
Is TXID predictable before transaction broadcast to peers?
Or in other words,can someone choose a certain txid he want when broadcast a transaction?
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kfreds
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Re: Can TXID be caculated before TX commited?
May 18, 2013, 02:38:21 PM
#2
Quote from: wangsw on May 18, 2013, 03:17:51 AM
Hello all!
Is TXID predictable before transaction broadcast to peers?
Or in other words,can someone choose a certain txid he want when broadcast a transaction?
Hi!
Yes, it's a hash based on the content of the transaction. See the bitcoin wiki or this question:
http://bitcoin.stackexchange.com/questions/2859/how-are-transaction-hashes-calculated
The answer to the second question is no. Furthermore that would be an undesirable feature of a hash function. See "preimage attack".
wangsw
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Re: Can TXID be caculated before TX commited?
May 19, 2013, 02:55:34 AM
#3
Quote from: kfreds on May 18, 2013, 02:38:21 PM
Quote from: wangsw on May 18, 2013, 03:17:51 AM
Hello all!
Is TXID predictable before transaction broadcast to peers?
Or in other words,can someone choose a certain txid he want when broadcast a transaction?
Hi!
Yes, it's a hash based on the content of the transaction. See the bitcoin wiki or this question:
http://bitcoin.stackexchange.com/questions/2859/how-are-transaction-hashes-calculated
The answer to the second question is no. Furthermore that would be an undesirable feature of a hash function. See "preimage attack".
So we can still have a hash set to choose from by select different vin or nLockTime without ruin a transaction.
grue
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Re: Can TXID be caculated before TX commited?
May 19, 2013, 03:04:51 AM
#4
Quote from: wangsw on May 19, 2013, 02:55:34 AM
So we can still have a hash set to choose from by select different vin or nLockTime without ruin a transaction.
yes. you can change the txids as much times as you want, but there's no easy way to get a specific txid.
It is pitch black. You are likely to be eaten by a grue.
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