Questions tagged [transaction-verification]

Refers to the process of checking the validity of transactions.

Filter by
Sorted by
Tagged with
3 votes
1 answer
254 views

Is there any way to send an output to a script which can then only be sent to one of two addresses?

Is the following scenario possible? I want to send money to a script. This script will require knowing a private key to spend, as usual, but the script is only valid if the money is being sent to one ...
user avatar
  • 447
1 vote
1 answer
711 views

How do miners/clients prove a transaction is valid? [duplicate]

To prove a transaction is valid, you must prove that the source address has a balance at least as much as the transaction. How does one prove this in a performant manner? The block chain of bitcoin ...
user avatar
  • 1,110
2 votes
3 answers
145 views

When to check for confirmationsl

When monitoring incoming transactions for a web wallet, should I check for confirmations on a timer, e.g. every minute? Or should I check once every block by using blocknotify?
user avatar
  • 1,909
5 votes
1 answer
253 views

walletnotify and transaction malleability

To monitor inbound payments for a web wallet, I plan to use walletnotify to record the transaction IDs, then on each blocknotify I will check the number of confirmations for each pending transaction. ...
user avatar
  • 1,909
6 votes
4 answers
1k views

Is it possible to add a transaction input to a transaction in the mempool?

Is it possible to add an input to a transaction that is in the mempool? For example, if someone is paying 1 BTC to their friend, I can get the raw hex data of this transaction from the mempool before ...
user avatar
  • 1,122
3 votes
3 answers
228 views

What if the execution time for an alt coin script exceeds the block time?

I don't know when and how often a script is executed, but it seems to me that there would be a problem if a single script (or a sum of all scripts in a block) exceeds the time it takes to be included ...
user avatar
2 votes
1 answer
374 views

Verification of transaction once trasaction is broadcasted

I have few doubts regarding verification of transaction and am trying to find answers from last few days. I agree similar post exist in this portal but I am not getting satisfactory answer for my ...
user avatar
2 votes
2 answers
228 views

mtgox failure... any implications for bitcoin/ecurrency protocol design?

last heard, estimates are Mtgox lost about ~$½B ... apparently the current bitcoin market cap is around ~$8B ie Mtgox failure roughly somewhere around 1/16th the entire market cap of bitcoin, a ...
user avatar
  • 205
2 votes
2 answers
311 views

Why aren't Bitcoin transactions processed and verified by normal Bitcoin clients?

My understanding is that the blockchain is exclusively built by miners. My question is, why isn't that verification done by every Bitcoin client - kinda like p2p file sharing programs allowed people ...
user avatar
1 vote
1 answer
340 views

Who will verify any transaction when the upper bound to total number of bitcoins is reached? [duplicate]

I've read that there will be around 21 million BTCs. (How many bitcoins will there eventually be?) Also, to my beginner understanding, it seems that miners verify the active transactions. (What are ...
user avatar
  • 133
-2 votes
1 answer
261 views

In layman's terms, can anyone explain to me how miners generate Bitcoins and process transactions at the same time? [duplicate]

I don't grasp how to the activities are tied together.
user avatar
2 votes
1 answer
176 views

Cryptoissues? (stocks & bonds)

Are there any examples of cryptoequities or cryptoliabilities? I've seen the cryptostocks site, but it doesn't look to be what I'm envisioning. For simplicity's stake, please imagine a corporation ...
user avatar
2 votes
1 answer
655 views

Are transactions verified in chronological order?

I've seen that blocks include timestamps which are updated "Every few seconds", but who updates the timestamps, and are the timestamps used to verify transactions in chronological order? If a block ...
user avatar
4 votes
1 answer
209 views

Exhaustive technical explanation of signing & verification

I apologize for such a noobish question and am ashamed that I'm not getting this yet, but I can't seem to put together all of the pieces. I've read every question I can find on the subject, the ...
user avatar
1 vote
1 answer
124 views

Is a low difficulty insecure?

Please ignore the connection between difficulty & creation rates for the purposes of this question. Can a difficulty be set so low that the security of transactions is compromised? In other ...
user avatar
2 votes
1 answer
219 views

"Instantaneous" transaction verification?

Jan Moritz Lindemann graciously educated me that difficulty is used not only to regulate the creation rate of a cryptocurrency but also to allow for block propagation thus prevent orphaned blocks. ...
user avatar
0 votes
1 answer
349 views

Authentificate myself as the sender of a bitcoin transaction [duplicate]

How can I prove my ownership of a tx's sending address to the receiver, assu? I can not answer This question, but to help anyone out, reading this: Since localbitcoin's signature verification is ...
user avatar
1 vote
1 answer
455 views

Transaction verification

I run a 0-confirmation tool. To track new transactions I use: bitcoind getrawmempool new transactions in new block not available in mempool (it seems I do not receive all transactions in mempool ...
user avatar
  • 13
0 votes
2 answers
2k views

how to do address callbacks?

I'm building a webapp that needs to update account info and send a message when an account's address gets a deposit, and/or confirm withdrawals. I'm not sure what the best way to do this is. Would ...
user avatar
  • 539
3 votes
1 answer
210 views

How are transactions verified to ensure only the eligible person can spend a Bitcoin balance?

I know each user has a public key and private key. The users signs the transaction with his private key and sends it to a Bitcoin address. What prevents me from claiming his coins? I read something ...
user avatar
1 vote
1 answer
4k views

What happens to transaction once all the blocks are mined?

Once all the bitcoin blocks are mined(21 million limit has been reached) then would calculating the nonce still be so power intensive since the reward at this point of time would only be the ...
user avatar
5 votes
3 answers
2k views

Do miners have to hold all the blocks in memory?

Running a miner node, one would have to verify transactions. This includes checking all the inputs of all the transactions. Does this mean that a miner must hold all the block-chain in memory (...
user avatar
8 votes
4 answers
18k views

Why is mining necessary for the Bitcoin network/system? [duplicate]

I understand that a transaction is a record of 1+ Bitcoins being given from one party to another. I understand that a block is a collection of unverified (pending) transactions that gets verified ...
user avatar
14 votes
4 answers
21k views

relationship between bitcoin miner and verification of transactions [closed]

Bitcoin miner mines a block, which can't be submitted to the network without proof of work. And the new block contains all of the new transactions. Hence the new block acts as a security measure, and ...
user avatar
  • 349
19 votes
1 answer
35k views

How do nodes verify Bitcoin Transactions?

I am trying to understand the role played by various nodes in the Bitcoin Network in verifying the transactions that are taking place in real time. I think that I understand the process of Transaction ...
user avatar
  • 1,013
3 votes
1 answer
556 views

What are the requirements of a transaction being included in a block?

What are the requirements of a transaction being included in a block? How does a miner verify that a transaction meets such requirements?
user avatar

1 2 3 4 5
6