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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Multisig input 101

I was in the http://coinb.in/multisig/#newTransaction and wanted to make a input but it needed 2 values. Txid, How do I get that? TxIn, Whats that and how do I get that?
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Monitor bitcoin addresses for new transactions

This is usial checkout functionality. Show address to the user and needs to monitor it for new transaction during n minutes. Addresses not unique for each payment. Optional:it would be good to have ...
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25 views

Can two outputs from the same transaction be spent separately?

I am reading the transaction part. I don't know how to get the transaction hash. Does the whole transaction (include its vins and vouts) get hashed? If a transaction has two vouts (spent by different ...
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13 views

How can I find out if a transaction used a specific vout as its input?

I want to know if a certain output is spent. I am not using Bitcoin, I do not have a gettxout RPC call available. How can I learn if a vout is referenced as an input somewhere in the blockchain or ...
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1answer
17 views

Redeem bitcoins of non-standard transactions made with eligius

As I understand it, Eligius is the only miner pool accepting non-standard transactions. The Opcodes for the scripts are here. Some use cases for non-standard transactions can be found here. My ...
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31 views

How to generate transaction offline that spends from multiple addresses

How to generate pushtx transaction from multiple private key (or)to multiple address. Example: I have some address with balance address1 => 1btc address2 => 1btc address3 => 1btc address4 ...
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57 views

How to recover from a double spending attack?

I found myself incapable of answering what would happen in this case, so here it is: A hacker (Mr Hacker) spends UTXO_1 and UTXO_2 in TX_1, depositing the monetary value of all TX_1's outputs into a ...
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Critical bug in Coin controller [closed]

I was investing in Coin controller but its and critical bug that makes my investing not SHOWING! It says that it have been send and I still got 2 min left but it never show!!! This happend both when I ...
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1answer
23 views

Why am I not getting payments on my bitcoind on an amazon ec2 instance?

I have an amazon ec2 instance running a web server, MySQL server, and bitcoin daemon on ubuntu 14.04, and I ran ./bitcoind getnewaddress and the output was an address. I sent a few cents worth of ...
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50 views

Time to send bitcoins?

I was investing bitcoins in Coin Controller but I need the time to send it because they only give you 10 minutes. So I want to know how to calculate the time to send bitcoin with for an example ...
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We are running an e-commercial site. A client used an wrong address for transaction and he is asking us to finding those coins [duplicate]

We said its impossible to find those coins since he don't have the wallet; How can it be possible somebody got an wrong address with the right checksum and he does't possess the wallet.dat file.
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140 views

Redeeming a raw transaction step by step example required

I am looking, specifically, for a step by step example transaction of sending Bitcoin which uses an actual transaction (How To Redeem A Basic Txn, from a few years back, does a great job of outlining ...
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24 views

OP_RETURN with bitcoind not working

I have created a raw transaction with the following hexstring which decodes to: { "lock_time":0, "size":248, "inputs":[ { "prev_out":{ "index":1, ...
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1answer
63 views

Do you need to be connected to the internet to send someone bitcoin?

Say I walk into a store that accepts bitcoin. I decide to buy something and go to the counter. I get my smartphone out to pay the bitcoin. Does my smartphone need to have an internet connection to ...
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3answers
61 views

Bitcoin transaction with dust output stuck

I made this transaction more than 24 hours ago, and it still has no confirmations at all. What should I do? This transaction was created by the mobile Blockchain.info wallet. At the time, it didn't ...
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21 views

How to get detailed historical transaction data?

I'm trying to predict bitcoin prices at any point in time. For this I need to have samples of transaction data for any point in time. The API would probably take a start_time parameter and return a ...
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1answer
43 views

A life-cycle of a transaction - correct?

Newbie alert ! Please let me know if this is not the right forum. So I have spent time reading up on Bitcoin. I think, I understand now; but, would love to have it confirmed. To start with, we have ...
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68 views

When miners are working on their block, do everybody's block have the same transactions in them?

In this webpage https://en.bitcoin.it/wiki/Blocks, it says this "Bitcoin transactions are broadcast to the network by the sender, and all peers trying to solve blocks collect the transaction records ...
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40 views

If I am spending multiple inputs from the same address, must I provide a signature for each input?

Suppose I have two inputs belonging to the same address. Do I need to provide a signature script for each input that proves that I own it? Wouldn't that waste space? Also, in the standard client, ...
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3answers
131 views

two people with same PUBLIC address, how will people/network know how to deliver bitcoin

I understand that a bitcoin address is a combination or more than one kind of encryption and entropy, and I also understand how improbable it is that the same address will get generated at the same ...
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Infinitecoin (IFC) transaction delay

A few weeks ago, I made a transaction from an online wallet (coins-e) to my personal (infinitecoin-qt) wallet. Initially I looked for the transaction ID using exploretheblocks for Infinitecoin's ...
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1answer
19 views

Block chain api support - Im unable to seperate the credit and debit transactions using blockchain api

I'm using blockchain api to display transactions of credits and debits seperately, I'm using the below procedure for displaying credit and debit transactions. But credit transactions are showing in ...
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74 views

How does the ECDSA verification algorithm work during transaction

I understand the basic concept ECDSA where if Bob wants to sign a message it generates a random number n, multiply it with the secp256k1, r = the x value , s = (H(x)dr)*n^-1 mod q. Also the ...
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2answers
47 views

How are transactions broadcast to the rest of the network?

If a person sends a transaction to another person, and Bitcoin is a peer-to-peer application, how will the transaction get to the rest of the Bitcoin community? How does everyone have the same ...
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49 views

How are transactions secured?

I'm a programmer and want to get to know more about encryption and how Bitcoin works, but there is not much on the web describing how all this code works. It would help if there was some visual way to ...
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1answer
64 views

Bitcoin transaction priority calculation

From the Bitcoin wiki page on transaction fees: Transaction priority is calculated as a value-weighted sum of input age, divided by transaction size in bytes: priority = ...
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1answer
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Difference between Outpoint structure returned from Blockchain.info and what is in the Protocol Specification

if you follow this link, you will see a specific bitcoin address. If you look closely at the prev_out field, it is not an outpoint structure. Inside of the protocol specification under transactions, ...
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Altering a block after generating it

Once a miner has found a block, how easy it is for him to add or remove a tx included in that very block? Would he have to solve the modified block from the scratch or is there a point he can resume ...
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42 views

Block Chain API for BTC transactions

I want to fetch transactions for an address from the following api: https://blockchain.info/address/$btc_address?format=json The thing is understanding the json returned from the api, I don't ...
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1answer
38 views

How is the distributed transaction log stored in P2P network?

After mining, a block is validated and broadcasted by the miner. Then, where does this newly mined block get stored at? Where does my Bitcoin client pull the transaction data from?
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59 views

Unconfirmed transaction - Non(e) standard input

A few hours ago, I created an offline transaction using the offline transaction tool available at: https://www.strongcoin.com/downloads/offlineTransaction.zip I coped and pasted the resulting ...
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40 views

Which part of code (function) handles received transactions?

I was trying to understand the flow of control between functions (operations performed and their order) when a transaction is received.
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104 views

Where is the bitcoin wedding transaction?

There has been some buzz in the news about a wedding that put a statement in the blockchain declaring their message. Here is one source that reported on the news. Can anyone provide a link to the ...
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116 views

What is the average size of a bitcoin transaction?

I'm curious, since the inception of bitcoin, what is the average size (in bytes) of a bitcoin transaction? To be clear, the easiest way to find this is not to take the size of the block-chain and ...
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226 views

bitcoin mssql decimal/money storage size

What's the decimal storage requirement in ms sql for bitcoin? GAAP standard quotes decimal (13, 4) for money. Is decimal (13,8) preferred for bitcoin or something else?
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45 views

Blockchain.info, How to receive new transactions (not websocket)

I'm trying to build safe transaction-confirmation app and need to synchronize new not-processed transactions. For example I monitor address A and have processed last transaction B, how can I ask ...
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34 views

How safe is sending out transactions using unconfirmed inputs for a service?

I've been running into problems with a high-traffic hot wallet, where a single transaction would lock up any input for a block with the spendzeroconfchange disabled. Would it be safe for a service ...
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29 views

How to index the UTXO set efficiently?

I haven't been able to find information on how to efficiently index UTXOs. Can you explain or point me to some resources? Update: Btw, I understand completely that the notion of address balance is ...
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How Satoshi managed to mine so much bitcoins beign the first user of the system? [duplicate]

I'm just learning Bitcoin and if I understand it's conception properly, mining of bitcoins means validation of transactions by computing hash which should satisfy some preset condition. In other ...
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74 views

Understanding Bitcoin protocol (through practice)

OK, firstly, Ken Sheriff (the guy who mined Bitcoin using pencil and paper) has posted some fantastic Bitcoin articles on his blog. In "Using Bitcoins the Hard Way" he writes (emphasis added): It ...
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1answer
36 views

How to tell which account an unspent vout is in?

When I go to send coins, I want the transaction to ignore the unspent coins in a certain account. I think I can do this in wallet.cpp, but I'm not sure how. Maybe in the AvailableCoins() function? ...
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2answers
73 views

Accepting 0-confirmation transactions and detecting double-spends with open source solution

I would like to accept 0-confirmation bitcoin for very small amounts. I am happy to accept zero-confirmation spends and am aware of the risks. However, the tool needs the ability to "flag" the ...
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1answer
105 views

Why is the address 1MAdS7aPszWG4EYgBpbF9mnGUi5ChbMu8d sending me Bitcoins?

I'm receiving 1 satoshi today from an odd address. This account has been very consistent in creating spammy transactions that distribute 1 satoshi to a lot of account. Any one know what's going on ...
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2answers
55 views

How do Bitcoin transactions work, and what does one need in order to send or receive one?

I am trying to understand how Bitcoin works and whether it is possible to manage a bitcoin transaction anonymously. If someone transfers a bitcoin, what do I need to sign it with? Can it be signed ...
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68 views

How to set a payment in Ripple without specifying currency issuers?

I want to send IOUs from one of my accounts to another through the use of the API. Both of the accounts trust the same IOU issuer, which is a separate address. According to the Transaction Format, I ...
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2answers
25 views

What's the minimum transaction with nxt?

Currently the minimum transaction on Bitcoin is 5430 Satoshi, and what about NXT?
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218 views

Why do transactions with lower input age require higher fees?

I am trying to understand how bitcoin fees work. I have understood well why transaction with many inputs require higher fees but I can't figure out why transaction spending virgin bitcoins would ...
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79 views

Inevitable dust spam

Given I have an account with balance 1BTC + 1 satoshi. I want to transfer 1BTC to another account and tribute 0.0001 BTC out of that 1BTC to the network as fee. Would my transaction being rejected for ...
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31 views

Can zero-fee txs get into a block?

What happens if a transaction is set to have zero fees? Can it get into a block? Also, if you updated a coin's code to accept zero-fee transactions, would this cause a hardfork? (e.g. made tx's in ...
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Blockchain.info automatic transaction

On Sep 17 I wanted to transfer 0.001 BTC from one Blockchain.info account (bitcoin address 1BFFtYPgtaZUHujDqiehqSseZvuUzJQxki) to another Blockchain.info account (bitcoin address ...