Questions tagged [transaction-verification]

Refers to the process of checking the validity of transactions.

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Double spend a tx output already spent but unconfirmed because of low fee

In the protocol rules for validating transactions it says: Rule 9: For each input, if the referenced output exists in any other tx in the pool, reject this transaction.[5] I assume that when a ...
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920 views

How does merkle tree verification of transaction work?

From what I have read, suppose B sends 1 bitcoin to C. C wishes to verify B's payment and asks C for the block number (location) that input transaction is located at. (Is this correct understanding/...
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Do Bitcoin miners verify validity of merge-mined Namecoin blocks?

I've been reading a little about merged mining as used in Bitcoin and Namecoin. It seems like merged mining effectively eliminated Namecoin-only mining pools, right? Since Namecoin-only pools are ...
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Following SegWit implementation, is BIP-146 signalling and implementation still on the docket?

Is BIP 146, which defines using the low S value, still on the docket to be signalled and implemented given that SegWit fixed the txid malleability issue by moving the witness outside the transaction? ...
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68 views

Message: “this payment has not yet been transmitted”

My smartphone wallet samsung android with application bitcoin core version wallet 7.04 does not get paid. Message: "this payment has not yet been transmitted". from March 18 at 18:56 (NYC) I have ...
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How does transaction authentication between buyer and seller look for?

I am new to cryptography and would like to understand how a digital signature works between a buyer and a Bitcoin seller. How does transaction authentication between buyer and seller look for? Please ...
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515 views

bitcoin transaction spent but not received

I hope you are well. I had a weird transaction which was sent a few days ago, it now says spent, and received but has not changed my wallet balance, sent it from one exchange to another. When it is ...
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82 views

How to send an invalid transaction for testing purposes?

How could I send an invalid transaction—for testing purposes, such as with testnet or regtest? For example, I would like to to try to double-spend, spend non existent coins, etc.
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Where is the code for verification of multi signature?

I want to apply the multisig system to my own project. It's not hard to get the code for the client (or signing?), but where is the code for the verification process?