Transactions are signed messages regarding the transfer or generation of bitcoins. They are broadcasted through the network and, if accepted, integrated in the blockchain.

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How does the scriptPubKey for this test vector work?

The scriptPubKey for cbebc4da731e8995fe97f6fadcd731b36ad40e5ecb31e38e904f6e5982fa09f7 is: ...
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2answers
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Where is the code making OP_RETURN a standard transaction type?

I am looking through the bitcoin github history. I am trying to find the commit where OP_RETURN became accepted as a standard tx. This was included in the changelog for Bitcoin Core 0.90. Any help ...
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Transaction ordering when one transaction redeems another within a block [duplicate]

Say we have txA and txB, and txB contains an input that redeems an output from txA. In order for a block containing both txA and txB to be valid, is it necessary that txB be after txA in the list of ...
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27 views

Constructing, signing, and pushing a Bitcoin transaction by using pybitcointools with Python

I'm utilizing the pybitcointools module in python 3.4 I've went through time and time again in the examples listed on the github page, but it isn't documented very well nor is the code. My situation ...
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53 views

Why does Bitcoin use the input/output system?

Why don't we just use balances? The nodes would verify that balance > 0 before validating the transaction.
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I sent bitcoins to my wallet before it was synced. Is there anyway to transfer the funds to a different wallet without waiting fo it to properly sync? [duplicate]

I sent bitcoins to my wallet before it was synced. Is there anyway to transfer the funds to a different wallet without waiting for it to properly sync? The wallet still says no available funds or ...
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48 views

Could increasing Block size solve the “End of mining” issue

Disclaimer: I am new to this forum and Bitcoin/cryptocurrency in general. After all 21 million bitcoins are released into circulation, it seems that the incentive to mine is gone unless transaction ...
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1answer
41 views

Ethereum - how is the output of a contract computation verified?

This may be as simple as a pointer to some place in the docs I've missed, but how/where is the output of a contract's computation checked, or assured against a malicious miner with an intentionally ...
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69 views

Why hasn't my bitcoin transaction gone through?

So about 3hrs from now I made a transaction to a different wallet of mine and the money didnt come through in 20mins I checked the blockchain and the number of confirmations kept rising and its up to ...
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2answers
37 views

Why do transactions propagate?

It seems like miners would have an incentive not to propagate transactions that came their way. Not propagating would both save them a bit of network use and make it more likely that they would claim ...
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17 views

Is there a service that can track how a coin flows from one wallet to another visually?

I sent some coins to an address and would like to track how these coins are flowing into other wallets. Is there a service that shows this visually? My main point is that I want to know if these coins ...
2
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1answer
49 views

Why does an exchange of bitcoin transaction not need to be over a secure connection?

I apologise for my rather ignorant question and maybe my question is completely wrong. But my impression about one of the advantages of bitcoin (digital currencies) is that when a customer pays a ...
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1answer
33 views

POS Receipt payment identification

Lets have a scenario where POS software wants to support bitcoin payments with zero risk. Ideal is to store Merchant's Bitcoin address in POS settings. The intention here is to uniquelly bind receipt ...
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1answer
27 views

Service that displays how many inputs/outputs there are in the blockchain?

Ideally, I am looking for a service like http://statoshi.info/, but one that displays the real-time number of inputs and outputs in the blockchain. Note that I am not looking for information on the ...
2
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1answer
23 views

How can I request payment to a set of addresses?

I am building a payment processing service where a single payment may be split among multiple individuals. While it would be possible for me to write the service in such a manner that a customer pays ...
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2answers
113 views

Why are transactions separate in a block?

I'm just getting started looking at bitcoin and it's protocol, so this might be an incredibly stupid question. Why does bitcoin have a separate concept of transactions? Wouldn't it be better for each ...
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6 views

Multiple transactions from a single wallet in one block [duplicate]

I am trying to understand how it would be (and if it is) possible for a single wallet address to have more than one transaction in a single block? Does a previous transaction of a wallet address need ...
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1answer
52 views

Can you include a signature in a bitcoin payment?

I know you can use the bitcoin client to sign messages (for which you own the private key) and verify messages from other public addresses. But can you actually embed a signed message into a ...
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2answers
108 views

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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1answer
66 views

Bitcoin how to get X value from Y

How to get X value from Y? ECDSA x,y coordinate validity verification doesn't seem to work X = 0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 Python code, p = ...
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1answer
19 views

Is it possible to execute a CLTV transaction in bitoin core 0.11 console?

The title says it all. How can one perform a op_checklocktimeverify transaction using bitcoin core? I've searched around and I've found a few repo's on github but nothing about how to do it in the ...
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1answer
38 views

Why new public key for every new request?

I created Bitcoin accounts using different clients but all clients I tried prompt for new public key for each request. My question is shouldn't be the public key one's identity which one should be ...
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3answers
50 views

How to monitor the blockchain for new blocks

I want to scan new transactions as they are added to the block chain. Does anyone have a suggestion on how to do this. Are there any APIs that allow for this? Or is there a way to directly tap into ...
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2answers
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How large is the current utxouts set

There was a website which shows statistics about the size of the set of all unspent transaction outputs. I can't find it any more.
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1answer
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How to return change (utxo - inputs) to output address?

I've been learning to create bitcoin transactions for 3 weeks now, but keep paying the entire unspent_outputs - inputs as fees, even if the transacted amount was like 1/100 th of the outputs. How do I ...
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63 views

Transaction never confirmed over 2 days [duplicate]

I did a transaction from my bitcoin core wallet. The transaction 6263452f635713e60f83d45fe41b1c9ba3b5f5e3af664778bf18a05b15cfde06 has not confirmed, and it is now over 48 hours since I made the ...
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I am new to Bitcoin. Can you see why I fail to broadcast my transaction?

I'm new to bitcoin, and I can't understand how to construct a transaction. My problem is not with the code, but with bitcoin itself. Concepts like unspent_output are new to me. The example below ...
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1answer
65 views

Does an OP_RETURN script always need another output within the transaction?

I was reading this: Explanation of what an OP_RETURN transaction looks like and I wondered if the second output "value" : 0.00200000, was at all necessary. Can I just have a OP_RETURN with a 0 output ...
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1answer
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BIP65: “replacing ntimelock entirely”?

BIP65 discusses replacing the ntimelock field with the new CHECKLOCKTIMEVERIFY OP code: As an aside, note how if the SignatureHash() algorithm could optionally cover part of the scriptSig the ...
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1answer
40 views

Release A Bitcoin From Multi Sig Address?

I just made a multi sig address from 3 address bitcoin and the result from that is 3Gf18oGoTaNCW38dVKe2ygNpUvUJmg6TY9 and i want to know how i can release the bitcoin ?
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3answers
112 views

Transaction without fee

If i want to make a transaction and sent it without fee how long it will be getting conf ? And my friend told me it will take more than 1 day. Can anyone here explain to me why it can be happen ?
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2answers
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Versions of protocols for BTC and TEST?

I'm dorking around with creating a TEST transaction using libbitcoin's bx command. Besides setting the inputs and outputs, the bx tx-encode sub-command allows one to specify lock_time and version. ...
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61 views

Transaction broadcasted to the Bitcoin network but not in my mempool

I use armoryd (0.93.1) to send transactions in the testnet Bitcoin network with the three calls: 1. createustxtoaddress 2. signasciitransaction 3. sendasciitransaction The calls are all successfull, ...
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Unable To Find Transaction Outpoint

I'm working on a project that involves constructing raw transactions and signing them locally before pushing to the network. I keep getting Unable To Find Transaction Outpoint ...
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How can a miner choose which transaction to include in the next block?

This question is not a duplicate of Can miners choose which transactions to mine? Everybody seems to agree on the fact that miners can select which transactions they are mining. But I can't find a ...
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What is the mechanism of determining the transactions of a new block

I am newbie in the Bitcoin field. I have read about the transactions, blocks, blockchain and other materials. As I know, when a new valid block is found and announced by a user, other users start ...
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3answers
98 views

How to pay no fees?

Is there any API where I can create some addresses and making a transaction beetween them just once a month without paying fees? Or if you can recommend me somewhere with a fee under 5000 satoshis it ...
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transactions traffic jam possible?

or there is security from that?
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How do I find out what block a transaction is in?

I'm trying to do research on the age of transaction outputs at the time they are spent. I'm running bitcoind on my computer. I have transactions indexed with txindex=1. I want to take a given TXIN and ...
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account id & bitcoin amount & message ?-> show website content

I am planning to make an website / wordpress plugin. Site will ask visitor's account id. Site will show content only if a bitcoin transaction with specified account id & bitcoin amount & ...
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37 views

Transaction for real use / transaction for changin Bitcoin in other currencies?

How can I calculate the ratio between this two type of bitcoin transaction? Is it correct divide the total volume USD of the data at this link: ...
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156 views

Are loans with enforced repayment possible on the blockchain?

Are loans with interest possible in Bitcoin, such that repayment is enforceably encoded with Bitcoin Script on the blockchain from the establishment of the lending contract?
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dual-sig wallet with upper limit on one of the keys (for Basicincome.co)

a user might want to authorise an app to send transactions from their wallet, but with an upper limit. examples: subscription to services. auto-billing. micropayments (like BitTip, or CoinAwesome). ...
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80 views

blockchain.info transaction timestamps set into the future

There seem to be some irregularities with Blockchain.info's transaction timestamp (aka Received Time) for a set of blocks. The transaction times are recorded with unix timestamps well into the future ...
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Any bitcoin transaction to get S1 and Z1 and R value script need

bitcoin transaction to get S1 and Z1 and R value script need Need script that gives bitcoin translation to S1 and Z1 and R value like below link ...
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converting RUBY script into PYTHON ( Recovering private key when someone uses the same k twice )

require 'ecdsa' public_key_hex = '02a50eb66887d03fe186b608f477d99bc7631c56e64bb3af7dc97e71b917c5b364' msghash1_hex = '01b125d18422cdfa7b153f5bcf5b01927cf59791d1d9810009c70cd37b14f4e6' msghash2_hex = ...
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1answer
52 views

What does this transaction mean?

First things first, I'm a newbie in everything related to bitcoins. I'm analyzing a few tens of addresses checking which ones have received payments, and one of them is the following: ...
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How many confirmation do i have to wait before i can spend the inputs I already received?

Can I spend Inputs with 0 confirmations?? If I could, are there some restrictions?
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70 views

Same identical R value of all transaction not provide corresponding privatekey

ECDSA Signature and the “z” value from above link learn calculation of z value and to get private key https://blockchain.info/tx/9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1 ...
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1answer
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Auto formatting data into sendmany command

Apologies for the newb question. But what's the best way to convert data on spreadsheet (lists of addresses and corresponding amounts to be sent), into a format suitable to be entered as a sendmany ...