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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What's “asm” in transaction input's ScriptSig

Given the structure of the inputs in the transaction vin inputs array { "txid" : "146183a58106544e81573e9f1ad13c7a2d7398dcaf42bb298fcea7858839d3b9", "vout" : 1, "scriptSig" : { ...
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Litecoin transaction fee

I have been struggling over the past few days to get some up-to-date information about Litecoin and I keep ending with nothing. To start off, I would like the formula that calculates the required fee ...
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36 views

Why does the hash come before the signature?

The first figure in the original paper of Satoshi is a diagram of transactions. This diagram seems to indicate that the transaction data is hashed before the sender's signature is appended. Why not ...
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can I spend/transfer bitcoins directly from cold storage?

From reading previous articles I understand that you can receive bitcoins to an address even if your wallet is in cold storage because the bitcoins sent to this address is recorded by someone on the ...
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28 views

How to make a simple payment with the python-bitcoinlib?

I've been using the bitcoin-python library for making payments from within Python. This worked pretty simple: >>> import bitcoinrpc >>> conn = bitcoinrpc.connect_to_local() ...
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4answers
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Get latest Bitcoin transactions in real-time

How is it possible to get the latest transactions txid in real-time? I mean to implement something similar to what blockchain.info does on its homepage. How do they do it to get all transactions info ...
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40 views

How to get instant notification of any Bitcoin transaction involving a specific public address as recipient without knowing the wallet or private key

Everything is in the title... For instance, Blockchain can do this if you import a public address and you set up their notification mechanism. Is there a way to do this in an intelligent (=efficient) ...
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11 views

Rational for unique transaction address [on hold]

I wonder why in the design of Bitcoin, a transaction uses a unique transaction address (couple public/private key if I understand it well). Would it not be possible to build a secure banking system ...
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9 views

Bitcoin Transaction's Historical and Geographical data

Just thought if anyone outthere ought to know where I can get access to Bitcoin Transaction's Data? (geographical + historical data on them). I've been working on my final year project and this, or ...
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Get a programmatical notification when an address receives a transaction [duplicate]

I am experimenting building an in-house Bitcoin payment system. What is currently the recommended practice to get notifications to your web server when a certain Bitcoin address receives a ...
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31 views

Automated transactions to addresses from database

I want to create a website where people can submit their altcoin address and they receive some for free. The addresses are saved in a MySQL database and the transactions are send from just one ...
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What is the best method of getting the originating address of Bitcoin transaction?

As far as I see there are currently two methods of getting the sender's address in a Bitcoin transaction: Look up the input transaction and read the corresponding output address there (like this: ...
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36 views

How to confirm offline a transaction

Is it possible to confirm a transaction offline in the following scenario: the "receiving" device is first online. There is no restriction at this point. Especially, it can prepare anything needed ...
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47 views

Is change of Bitcoin address of an account possible?

I have multiple Bitcoin addresses in my Bitcoin Daemon, Which address will be used for receive transaction Can i change my default account address(mentioned in 1) to new one
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Need to do 400 transactions, how do I get them confirmed?

I tried to send 0.00000001 btc to about 7 addresses, and paid the 0.0001 fee. But it seems like this transaction won't go through ever. Those coins are lost :(. I have about 400 sponsors, and they ...
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11 views

How to stream transactions on the network

How would I go about getting a stream of transactions broadcast on the Bitcoin network? Is this supported by the vanilla client? I know that the client can notify me on new blocks and on all ...
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18 views

Remove address sub from blockchain websocket API

According to the docs, Blockchain.info provides a websocket API that streams a few things: All unconfirmed transactions using "op: unconfirmed_sub" New blocks & the data they contain using "op: ...
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42 views

Cost of single vs multiple outputs to the same address

A transaction can have multiple outputs pointing to the same address however it's not clear to me if and how this affects the transaction's priority and cost? As an example, let's consider these two ...
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A question about CTransaction::UpdateCoins() in 0.8.6

The logic of this function is quite simple: 1, mark inputs spent Call coins.Spend() 2, add new outputs to database. Call inputs.SetCoins() My question is in step1, it invalidate the old output ...
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39 views

Specifics on “Race Double Spending Attacks”?

Hi guys I am doing some research on double spending in the bitcoin network several ideas have been confusing me: In prevention of Race attacks, merchants are advised to "connect to a large random ...
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1answer
110 views

Are public keys included in signatures?

I can't easily and quickly determine from these wiki pages, 1 and 2, if the public key is included in the signed message. Are public keys included in the signed message, or are they transmitted ...
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Transaction tracker in microsoft excel format

Say I made a business which takes care of thousands of bit coin transactions. The problem is how can I track how much is coming in and from which address at what date and what time (and how many ...
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How do transactions get vertified [duplicate]

I am wondering how do transactions get vertified. I understand that this requires hashing, but how the heck is hashing involved in this area. Thanks!
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53 views

Decentralised escrow / distributed private key generation

Issue Hi As many others i am curious in addressing distributed escrow problem (not just for bitcoin). As it stands now there are no decentralised escrows. All escrow services are based on trust in ...
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Most transacted account & how many?

I cannot seem to find this data on any of the major data provider sites. What Bitcoin address has performed the most blockchain transactions to date? How many?
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Transaction Maturity vs Block maturity

I thought it was the same. Block maturity - number of blocks created after. Transaction maturity - maturity of block that contain transaction Now I see that people use this terms as different. What ...
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How is over-spending one block apart prevented?

So, let's say you have a wallet with 20BTC, and you have a flow like so: You send 15BTC to A in block 1 You send 15BTC to B in block 2 What happens if at block 1 there are two chains across ...
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What are transaction fees [duplicate]

I would like to know what transaction fees are for, what they represent and how does one make money on these transactions?
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Is it possible to monitor all crypto-coins?

Different coins have their own blocks and wallets, I want to build application to support multiple coins and my questions is Monitoring all coins possible(view transactions, get balance etc)?
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How does Multi-Signature Pay 2 Script Hash (P2SH) enable stronger security?

Coinfloor says it will pay out withdrawals using Multi-Signature Pay 2 Script Hash. What is Multi-Signature Pay 2 Script Hash? I read What is "Script Hash" address exactly and how does it ...
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Bitcoind -walletnotify more than 6 confirmations?

I've configured bitcoind -walletnotify to run php script when callback is triggered. It works fine, but only notify until 3 confirmations are received. My goal is to notify when 6 confirmations are ...
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77 views

Why bitcoind/bitoin-qt is imposing transaction fee?

Bitoind is imposing transaction fee on 0.0001BTC forcefully even though i have set the transaction fee to 0, please tell can i transfer the money to some address without fee?
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Can someone explain nLockTime?

I'm having a hard time understanding how nLockTime works. The Bitcoin wiki has an explanation that is confusing to me: nLockTime is a parameter that can be attached to a transaction, that mandates ...
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91 views

What is the smallest sensible transaction? [duplicate]

While the smallest fraction of bitcoins currently implemented is the Satoshi (10-8 BTC or 10 nBTC (nano-bitcoins)), due to transaction fees there seems to be a minimum amount of BTC to be spent that ...
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Is there any way to send an output to a script which can then only be sent to one of two addresses?

Is the following scenario possible? I want to send money to a script. This script will require knowing a private key to spend, as usual, but the script is only valid if the money is being sent to one ...
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How do miners/clients prove a transaction is valid? [duplicate]

To prove a transaction is valid, you must prove that the source address has a balance at least as much as the transaction. How does one prove this in a performant manner? The block chain of bitcoin ...
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Coin address generation for all coins

We are developing UI for coin trading. We have a plan to use all the coins present in coinmarketcap. I am greatly confused how to generate coin address for all coins. I knew that from cryptsy.com, it ...
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When to check for confirmationsl

When monitoring incoming transactions for a web wallet, should I check for confirmations on a timer, e.g. every minute? Or should I check once every block by using blocknotify?
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229 views

Sent bitcoin with no fee, waited and bitcoins disappeared

I sent about $425 to an adress from my bitcoin-qt wallet and forgot to include a fee. So I googled and googled and waited around for 4 or 5 days for it to stop broadcasting but I get on my computer ...
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Multibit send me a link to active my new fund and download invoice but how can i get it on wallet?

the link, which Multibit send to me, lead to direct download of a Java file. How should I receive bitcoin at my wallet
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4answers
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Is it possible to add a transaction input to a transaction in the mempool?

Is it possible to add an input to a transaction that is in the mempool? For example, if someone is paying 1 BTC to their friend, I can get the raw hex data of this transaction from the mempool before ...
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Correlated raw transactions' input/output chaining

So I'm in the process of implementing a BTC-based payment module where for every transaction to a non-wallet account a fraction of the amount will end up to a charity account in a external wallet not ...
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What if a transaction is made to a wallet that doesn't exist?

Wallets can be created offline, and transactions can be made to that completely offline wallet through by obtaining that wallet address. Now, when the guy owning the offline wallet goes online, his ...
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Why is this transaction referred to as “low fee”?

Why does Blockchain.info refer to this transaction as "low fee", when it has the normal fee? What is wrong with it? Its size is less than 1000 bytes, with a fee of 0.1 mBTC – yet, this transaction ...
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1answer
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All about bitcoin [duplicate]

Hi this is Dushyant from India i heard about the bitcoin craze hence i checked on google and started visiting sites and earned few (hardly) satoshis, etc. But i dont know what is the exact value of it ...
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125 views

How does ScriptPubKey know the public key of an Bitcoin address?

I am currently having a blonde moment. The ScriptPubKey provides a hashed version of the receivers public key. scriptPubKey OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG However, if I give ...
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Could the standard pay to address script be simpler? e.g. no compare of the HASH160?

What if I had a scriptPubKey of <pubKey>OP_CHECKSIG And an scriptSig of <sig> Question Would that work in the standard client? Why do we need to check the hash? The only ...
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When computing a normalized transaction id, when do I finalize the sha256 hash?

I'm trying to compute the normalized transaction ID so that it matches what is on blockchain.into at the following URL http://blockchain.info/q/hashtontxid/ --- normal TX ID here ---- Given that ...
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23 views

Can I sign and redeem many outputs at the same time? (shrink the size of a tx Input)

I'm looking at this transaction that is redeeming many historical outputs from the same address. When I look at the blockchain, it seems pretty clear there is redundancy here of the public key being ...
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Can I cancel an offline transaction with this approach? (opposite of nLocktime)

I would like to cancel a transaction I sent offline, and am looking for ways to prevent it from being accepted by the network. Will the Bitcoin client prohibit the entire Tx if there is even on input ...