Questions tagged [transaction-id]

The unique identifier of a transaction corresponding to the sha256d hash of the transaction.

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Sending funds on same block of received funds. Confirm sending not received?

My question in quite conceptual: For creating a raw transaction, I just need the txid from the older transaction and the address to send it. Put the funds, the change, what's left is the fee. Sign it ...
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4 votes
1 answer
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Pairing pattern of txids in merkle tree

For constructing the merkle tree txids are paired and hashed. ¹ But how are these txids paired? Does it happen chronologically or is there a certain pattern of pairing?
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Duplicate tx ids

Is there a quick and dirty way to detect all transactions whose tx-id can be found in more than one transaction since the genesis block? I would also like to see mutated transactions as well ...
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Are transaction ids always the same length?

Do all bitcoin transaction ids (hashes) have the same length? I guess it's defined somewhere here: https://en.bitcoin.it/wiki/Protocol_specification but still I couldn't find it.
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Why does txID generation consider signatures?

I've been reading a lot about transaction malleability, and noticed that the only way to achieve it is by altering the transaction signature/s. Why does the protocol even consider the signature in ...
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How do I calculate the txid of this raw transaction?

I'm trying to parse a bitcoin block using Python. I called getrawtransaction over JSON-RPC. I got this: ...
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3 votes
1 answer
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What is the transaction ID?

I have sent a Bitcoin amount to someone who wants the transaction ID. What is this? Is it the hash shown on the LHS of the transaction?
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1 answer
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By whom and when can transaction malleability be applied?

Once I create a transaction and relay it to the network, who can alter the transaction id? Can the transaction id change at any time or only when the transaction is confirmed or unconfirmed?
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5 votes
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Duplicated hash values in mining reward

This transaction is contained in two MainChain-Blocks: https://blockchain.info/tx/e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468 On Blockexplorer there is a note of this anomaly: ...
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2 votes
1 answer
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How to find a block containing a transaction using transaction hash only?

Well, the title says it all. I have a transaction hash and I want to find this transaction in the blockchain. I am working with bitcoinj. I am probably missing something very obvious here, but I ...
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1 answer
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How to get transaction id (txid) in UI

I deposited dogecoins in my cryptsy account through faucet. How the transaction id (txid) has been displayed in cryptsy UI? suppose I make the transaction then I know the transaction id, but how ...
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When computing a normalized transaction id, when do I finalize the sha256 hash?

I'm trying to compute the normalized transaction ID so that it matches what is on blockchain.into at the following URL http://blockchain.info/q/hashtontxid/ --- normal TX ID here ---- Given that I ...
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12 votes
2 answers
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How can I avoid transaction malleability consequences?

Please note that this question is NOT a duplicate of other questions regarding transaction-malleability. My question is regarding a following scenario, that could happen on an exchange that uses on-...
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1 answer
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Alternative chain shows blocks with empty TXIDs - what's going on?

An alternative chain based on Litecoin 0.8.6.1 that I have an interest in is during certain low-difficulty periods showing several blocks that contain empty TXIDs. Digging into the TXIDs return ...
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23 votes
1 answer
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What is Transaction Malleability?

The Bitcoin exchange MtGox has stated in this press release that "transaction malleability" caused them to stop sending bitcoins. A recent question asked if it really is an issue. But what is ...
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