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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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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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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27 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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85 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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Versions of 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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26 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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16 views

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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29 views

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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33 views

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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93 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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62 views

transactions traffic jam possible?

or there is security from that?
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37 views

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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13 views

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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31 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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139 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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17 views

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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24 views

Micropayments: Oauth-like Token that lets an app sign transactions up to 1/x of an addresses IOU flow

this will let Basicincome.co: send transactions from your account My app calculates how much each user should pay to other users in the http://basicincome.co network. Smart Contracts will ...
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1answer
54 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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34 views

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
44 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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1answer
35 views

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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51 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 ...
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2answers
47 views

Setting up a basic test transaction for p2p donation web app - API recommendation

My question relates to the use case of trying to build a simple payment flow where one user (a donor) can donate directly to another user (a recipient) with Bitcoin. To begin with, I would like to ...
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190 views

Have any SPV users lost money because they accepted forged bitcoins?

I'm making a list of real-life examples of occasions where bitcoins were lost to various known attacks. One of these known attacks is that lightweight (SPV) wallets can't verify whether a transaction ...
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2answers
46 views

Is it possible to have a single input or output with multiple addresses

I've seen in more than one Blockchain API provider's specs where the transaction inputs and outputs are in the following format: addresses: ARRAY The address (or addresses in the case of multi-sig) ...
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68 views

Two identical R value finding z value from two transaction

tx1 from the trans1 i got Input Scripts 30450220262e481b6d8905b5adba67aff05eb8261501b0a9434c0b7f043d00cf8d23c91b022100bf82c0d212f30d3a0599e9b879516d762eaf5688ab83787cf470e99af5a6917101 ...
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1answer
69 views

same R value is used for two different addresses? finding z1 and z2 value and privatekey

txid1 txid2 input script 1 304502206bcc247f1259262b4035bfa84f0397a69f69baa01659daaf94fe1164b650c86a022100a044b38e8264a1c928ddd28b4657aa7109d1ea30e911208c7ce57abcb1451fe601 ...
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1answer
74 views

Can I have multiple OP_RETURN outputs in one transaction?

I am wondering if I can inject multiple OP_RETURN outputs in one transaction?
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1answer
20 views

Bitcoins send out after syncing wallet [duplicate]

Good day, can someone maybe help me. I just opened my wallet today after I exported it to a private key and incrypted it (Multibit wallet) and more than half of my coins has been send out to an ...
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2answers
186 views

How do I uniquely identify a transaction (to protect against malleability)?

Transactions I broadcast can be malleated by anyone watching the mempool (more info here). This rules out using txid for transaction identification. How can I identify my transactions to make sure ...
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35 views

Do all implementation of Deterministic RFC6979-compliant ECDSA signatures generate the same signed transaction given the same data?

So if I were to create the same transaction using bitcoinjs and bitcoinj, the end result of the signed transaction would be the same with both libraries, is that correct?
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63 views

bitcoin two identical R

Blockchain transaction id 30440220d47ce4c025c35ec440bc81d99834a624875161a26bf56ef7fdc0f5d52f843ad1022044e1ff2dfd8102cf7a47c21d5c9fd5701610d04953c6836596b4fe9dd2f53e3e01 ...
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22 views

Is this pattern a tracking method or just a Bitcoin wallet making change to itself?

While following a particular transaction from a donation received in 2011 I noticed a pattern in the block chain. The entity donating would send .001 to an address and the remainder of the wallet ...
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75 views

Bought a bitcoin, sender said it was sent, not showing in blockchain or wallet. Where is it?

So I bought a full btc off of localbitcoin with amazon giftcard code. I sent the code and clicked that payment was completed. It's been about 2 hours. About 1 hour since he said that he sent the ...
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54 views

Erroneous blockchain transactions…more coins than I specified!

This isn't directly related to Bitcoin; rather this is related to Infinitecoin, however the technologies are virtually the same. The other day I sent 2,000 IFC from my wallet (Infinitecoin-QT for ...
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26 views

Public API to verify transactions to a unique address as they occur?

I'm creating a WordPress plugin for bitcoin donations. I want it to behave similar to the checkout process for many bitcoin shopping carts, where the QR code is displayed then once the user scans and ...
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42 views

I have a merchant that only takes bitcoins can I just put the correct amount in the wallet and then pay them?

I want to pay a merchant who only takes bitcoin payments. Do I create a wallet and only put in the amount of the price and pay with it? If so then what do I do after I send it to the merchant?
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Which payment methods are suited for bitcoin trading? Which are sufficiently hard to reverse?

I'm aware of this list: bitcoin wiki - pament methods Unfortunately the list is incomplete and outdated. So far I've found SEPA, Okpay, Cash deposit (US) Can someone add to that list? I'm ...
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50 views

How instantaneous is a Bitcoin transaction?

How quick does a bitcoin transaction happen? (assuming that both parties are online at the time) I read somewhere on the Internet that it's not recommended to accept a bitcoin payment right away ...
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2answers
23 views

Why is pycoin getting the incorrect output address?

I am using pycoin version 0.52 from pypi and it is getting the wrong output address from a transaction. Code # testnet txid and corresponding rawtx # see ...
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54 views

Possible to auto-send one btc transaction every x seconds to same btc address?

is there a wallet/app out there that would do the following, or would it require bespoke script development? Automatically send a btc transaction to a btc address at fixed time intervals eg every ...
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1answer
24 views

Can a transaction be conditioned on signing another transaction?

I was thinking around http://lightning.network/ . My problem is Alice sending coins to Bob via Eve: A -- tx1 -> E -- tx2 -> B Is there a way to condition tx1 on Eve signing tx2?
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1answer
51 views

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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89 views

How to check BTC transaction when buying face to face?

I have never bought bitcoins face to face. Don't have iphone/ipad and therefore I would need answers on the following question: What do I need to have on my cell phone in order to provide seller my ...
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1answer
46 views

Transaction inclusion into block

What are reliable and good sources for understanding the procedure of transaction inclusion into a block? Problem outline: Given, there are multiple peers - let's say 5 - in a test network, where 3 ...
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2answers
91 views

Calculating “total received” and balance by an address

This is something which I think should be simple but it's driving me crazy. See for example this list of transactions associated with an address: ...
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45 views

Transaction too large error

I have over 1400 small transactions in my wallet that add up to a little over 0.2 BTC. I am trying to send them, but keep getting a transaction too large error. I have tried to set a custom ...
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How to sign a transaction using BitcoinJ

I am having problem signing the transaction using BitcoinJ library without the Wallet instance, I only have the Transaction class instance and the ECKey in order to sign the transaction. Is there a ...