Questions tagged [transaction-id]

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

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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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8 votes
2 answers
10k views

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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5 votes
1 answer
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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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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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8 votes
1 answer
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What happens when two txid's collide?

Let's suppose that I can create SHA256d collisions, and I use this ability to create two transactions that have the same hash, A and B. These transactions are not the same, but they hash to the same ...
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-2 votes
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I think I found 241 Bitcoin [closed]

I have been having dreams for the past month about BTC and an old computer I had bought Bitcoin on a long, long time ago. I just found said computer in my grandmother's basement. Booted it up and lo ...
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4 votes
2 answers
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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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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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2 votes
1 answer
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How to calculate txid for segwit transactions?

I'm having difficulty calculating txid for recent transactions. I followed bip-141 at https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki For the first transaction in the first block found ...
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1 vote
0 answers
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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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0 votes
1 answer
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After creation, what I have to do with a coinbase transaction?

I have create a coinbase transaction successfully with the command: createrawtransaction '[{"txid":"0000000000000000000000000000000000000000000000000000000000000000","vout":0}]' '{"...
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1 answer
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Values for txid and vout for create a coinbase transaction

I want create a coinbase transaction to go with a new block minned by my program. I am creating it with the json-rpc command createrawtransaction. What's the values for txid and vout in this case?
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Confused About Hash In Satoshi Nakamoto Diagram

In Satoshi Nakamoto's diagram: Consider the Hash block in the first transaction block above: How is that Hash value calculated? I see arrows from an Owner's Public Key and another arrow, so it's ...
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SPV clients querying the full node

Is there a way currently where an SPV client can send a TxID to a full node which is present in the UTXO set of the full node and have the full node not scan its entire blockchain to fetch the ...
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