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 often does a block have only one transaction?

I was looking at blocks on blockchain.info, and came across this one with only one transaction in it: (the mining reward one) ...
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1answer
11 views

Is the a library for generating signatures and transactions for scrypt coins?

I'm looking for a library similar to this bitcoin one but that works with scrypt based coins.
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2answers
38 views

Why does txID generation consider signatures?

I've been reading a lot about transaction malleability, and noticed that the only way to achieve it is by altering the transaction signature/s. Why does the protocol even consider the signature in ...
0
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1answer
21 views

What is min time to get first confirmation for transaction?

How much time does it take to get first confirmation for transaction? I don't need the exact number of minutes, just some useful approximation. I found this chart of average confirmation times, but ...
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1answer
26 views

Is Coinbase.com combining / commingling transactions or funds?

In this transaction, I transferred 2 BTC from my Coinbase.com wallet to an external address. Why are there 3 outputs in the transaction? I understand the output of 2 BTC, and the 0.0001 BTC ...
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2answers
26 views

Are the keys in a multisig transaction output hashed?

Pay to public key hash scripts hash the recipients public key for added security. Is the same done with the public keys that make up part of a multisig script? https://en.bitcoin.it/wiki/Script ...
1
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1answer
51 views

What does the “Cost per Transaction” chart on BlockChain.info show?

According to the Blockchain.info: Cost per Transaction, the latest "Cost per Transaction" value is 16 USD. Apparently, it's not the transaction fee, what does it mean then?
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1answer
27 views

Input validation in transactions

I'm just writing a small essay about the basics of BTC and I ran into a small problem. I know, that there are digital signatures in our bitcoins' earlier transactions (our transaction inputs) and in ...
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0answers
10 views

getrawtransaction - find destination and “change” addresses

How to get destination address and amount from result of getrawtransaction and how to distinguish it from "change" address using rpc api.
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1answer
25 views

Incorporating Bitcoin into a app for person to person payments

Is it possible to incorporate Bitcoin into a app my company is developing in order to process person to person payments?
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1answer
39 views

My balance gets sent back to me [duplicate]

I'm using the blockchain API to make a "send to many transaction". In the recipients I only put other people addresses, but somehow the API sends the remainder of my balance back to me. For example: ...
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1answer
59 views

How do I make a transaction

I want to make a multisig transaction but dont how to do it. I am using this site: coinb.in And what is Txin or N that it also can be called.
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0answers
46 views

Make raw transaction

I was making a raw transaction but I needed some values. First one it this: Txid, How do I get that without the bitcoin client? Second one: What is Txin and how do I get that?
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1answer
36 views

What happens to off chain transactions when the blockchain is reorganised?

Many companies seem to use off chain transactions to transfer bitcoins between their own customers. What happens when a side chain gains dominance and no longer contains a block with the underlying ...
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1answer
54 views

How do I find the txid and vout values for an input I want to spend?

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/vout, Whats that and how do I get that?
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4answers
93 views

Monitor non-wallet bitcoin addresses for new transactions

This is usual checkout functionality. Show address to the user and needs to monitor it for new transaction during n minutes. Addresses are not unique for each payment. Optional:it would be good to ...
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1answer
32 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 ...
0
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1answer
16 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 ...
0
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1answer
28 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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0answers
37 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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2answers
63 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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1answer
24 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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1answer
54 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 ...
0
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0answers
19 views

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.
5
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1answer
180 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 ...
0
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1answer
36 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
69 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
69 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 ...
0
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0answers
25 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
46 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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2answers
73 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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1answer
46 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
149 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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0answers
25 views

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
27 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 ...
2
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2answers
109 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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3answers
80 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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2answers
60 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
88 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 = ...
2
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1answer
22 views

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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2answers
63 views

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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2answers
63 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 ...
2
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1answer
41 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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2answers
75 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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1answer
43 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.
3
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1answer
115 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 ...
4
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1answer
128 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 ...
3
votes
3answers
239 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?
0
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1answer
58 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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0answers
37 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 ...