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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Bitcoin in third world countries

I am with the Adelante Foundation. We are a microfinance institution serving the poorest of the poor women in Honduras. We are currently toying with the idea of transitioning into a cashless model ...
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Is it possible to reverse mistaken transactions? [duplicate]

I'm referring to the challenge Bill Gates raised as a shortcoming of Bitcoin. Could it ever be possible to reverse a bitcoin transaction mistakenly sent to the wrong address?
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intercepting and editing transaction output

When a P2PKH transaction is created there are two main parts. the transaction input and the transaction output. I understand that the transaction input requires a signature that unlocks a previous ...
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Downloaded electrum, restored an old wallet, now BTC are stuck. How can I get them out?

How can I send them or reset password? Everytime I try to send it says invalid password. I tried by a couple different ways without luck. I deleted the wallet. Then I downloaded again and created ...
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Is there a fixed order for all transactions in the block chain?

Every block in the block chain contains a list of transactions. This list has a certain order which is basically set by the miner introducing the block. The merkle root in the block header requires ...
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Any efficient way to broadcast pending transactions?

A user creates and signs a transaction & broadcasts it to his linked-peers, the peers then rebroadcast it again without necessary receiving an inv message, then creating a flooded network with ...
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pycoin command line transaction

Is there a quick way to do transactions knowing only the private key(secret exponent) and the destination address, preferably from a command line utility such as pycoin? I am using Debian/Ubuntu and ...
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62 views

What is a block?

I know bitcoin has a block chain that is from my best representation a list of blocks. I know the block holds many transactions. But i'm still very much lost as to what a block is and how a block can ...
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Signature on transactions with multiple inputs

My question is that, suppose there is a txn tx(k) paid from user u to v, that refers two txns tx(i) and tx(j) as it's inputs. Also, both these inputs are meant for different public keys of u, say, ...
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How are unconfirmed transactions divided into different blocks?

According to https://bitcointalk.org/index.php?topic=216938.0 one transaction can only be contained in one block. If I understand correctly, miners can freely decide what transaction they include in ...
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If Bitcoin transactions require ~10 min to clear, how can payments get recognized within seconds?

Bitcoin Monitor offers to issue a notification moments after a payment is sent to a Bitcoin address. Yet, if Bitcoin transactions require about ~10 min to get written into the blockchain and confirmed ...
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e-wallet service: 1-step purchase/transfer

I want to buy bitcoin online and am considering both exchanges and online banking sites such as circle.com coinbase.com coin.mx Do these online banking (e-wallet) sites have provisions to transfer ...
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Transaction Duration

Given the volatile bitcoin value, how long is a transaction valid? For example, say a vendor requires X fiat currency via a bitcoin service provider. The service provider link (ie, coinbase.com) ...
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What is the maximum number of inputs/outputs a transaction can have?

Is there a maximum recommended number of inputs/outputs for each transaction? I was scripting a faucet and wasn't sure whether to payout in one transaction to all addresses or split them into groups ...
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walletNotify on every Bitcoin Network transaction

Is there any way by which I can receive each and every Bitcoin transaction that takes place on the Bitcoin network(not only my own wallet's transactions)? Just the way Blockchain.info provides a ...
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Can private keys remain offline for their entire life?

I am new to Bitcoin and this question is based on 3 assumptions that may be incorrect. Assumption 1: If I understand correctly, the Bitcoin address is generated algorithmically independent of the ...
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82 views

Does the bitcoin URI message parameter have character limits?

Is there a limit to how many characters are allowed in the message parameter of a BIP21 URI? I tried searching on the subject, but found nothing about it.
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Which bitcoin script forms should be detected when tracking wallet balance?

I am implementing a library for tracking wallet balance of given bitcoin addresses. How should the transaction output script be parsed to find if the output belongs to the given address? Is it dirty ...
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Why bother having limitations on Bitcoin Coinbase Transaction Scriptsigs?

There are a few limitations on the structure of the coinbase (reward) transaction in a block. There is only one input. vin.size() == 1 (source) It doesn't reference any previous output. ...
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Proving a transaction is mine

As an assignment in a digital security course, a group of 100 students was asked to transfer a small amount in bitcoins to a certain wallet. They promised they'd buy something for us from this money. ...
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What transactions will be included in the next block?

The miners decide whether a transaction will be included in the block. What information do miners have about unconfirmed transactions? How can I know, in detail, what transactions are going to be ...
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Can a wallet deny payments to it?

Once my public wallet address is known, is there anyway to deny payments to that wallet? For example, if I want an external authority to regulate who can pay into a wallet, is that possible? I ...
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281 views

How do miners receive transaction fees?

I know that in a transaction, the difference between the amount and the sum of the outputs is the implicit transaction fee, but how do the miners that verify the block containing that transaction ...
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How do we verify the signature on a raw transaction using Bitcoinj?

I managed to create a raw tx using Bitcoinj but not able to figure out how to verify its signatures. Assuming I know the addresses corresponding to the (supposedly) unspent outputs used as inputs to ...
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Transactions used to form a block

I've read the Developers Guide ( bitcoin.org/en/developer-guide ), asked a few peers and I still don't understand how the transactions are used to form the block. I did get that the transactions are ...
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Confirmed transactions lost in my synchronised node

I tried to get a transaction information using RPC method getrawtransaction in my synchronized node, but I got no information about the transaction. I did it in another node, and I could get the ...
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How to get the list of transactions that has gone into an address with the amount and date?

How to get the list of transactions that has deposited funds in an address, including information about the amount that has been deposited (sent towards my address not sent away from it), and the date ...
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Is there an easy way to consolidate Dust Microtransactions

I just found out today that all those websites I go to to earn like .0000087 for clicking around here and there have now in a way corrupted my wallet as yesterday I deposited 50$ into my wallet and ...
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Transaction input bigger than output

Yesterday I made a transaction from my one btc address to another by using pybitcointools library for blockchain api. I made a mistake by making input value 10x times higher than output value. So I ...
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accept bitcoin payments for orders without 3rd party software

I've been searching for an open-source alternative to blockchain.info's Receive Payments API (https://blockchain.info/api/api_receive). I want to run bitcoind on my own server and have payments ...
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How resilient are Proof of Stake (PoS) mechanisms to brute force quantum computing attacks?

The article called "Bitcoin vs. The NSA’s Quantum Computer" was a great read pertaining to Bitcoin, and computing minimum thermodynamic energy required to brute force attack public key to discover the ...
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Duplicate tx ids

Is there a quick and dirty way to detect all transactions whose tx-id can be found in more than one transaction since the genesis block? I would also like to see mutated transactions as well ...
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Do all transactions have at least one output that contains at least one bitcoin address

Do all transactions that are included in a valid block have to have at least one bitcoin address as part of their outputs (vout)? I found this to be similar: Are Bitcoin transactions permitted to ...
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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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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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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 ...
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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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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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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 ...
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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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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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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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35 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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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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How do I make a transaction [duplicate]

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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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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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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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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35 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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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 bitcoind, 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 ...