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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Hot to set TXID in rawtransaction?

My question is if I can set the TXID in a raw transaction and send it after it with 'sendrawtransaction' (from the qt console)? If not, is there a way to do it? And if there is a way, does it means I ...
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How to create the <sig> <PubK> part in “scriptSig”?

I've decoderawtransaction and see in the vin part a "scriptSig" ,which I believe to be the "unlocking script" . Assuming I have the private key in a paper wallet and someone send me transaction to ...
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18 views

Unable to receive/preview funds due to un-synced wallet

I bought bitcoins and sent them to the wallet, however the wallet is not synchronized and as a result I cannot see my bitcoins. Will I be able to see them as soon as the synchronization process ...
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14 views

Using bitcoind JSON-RPC, how to get transaction from input address?

I have an address from which all unspent txouts were used in a single transaction. How can I find out what transaction was that? In my node instance, listtransactions will not list addresses that ...
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26 views

How do I get to the value in the 'scriptPubKey' part of the transaction ?

How do I get to the value in the 'scriptPubKey' part of the transaction ? The sender knows only the address (1A3XjcuZmcszX2tGoVn1TrMNchuHwdAxZV) so how did he get into ...
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how to receive my awards? [closed]

I'm solo mining with two ASIC miners at 150 GH/s. On a solo mining pool with cgminer with my address wallet in user. I've all the time shares accepted and New block detected because this pool would ...
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1answer
40 views

Check if a user pays another user for bitcoin website

I am creating a bitcoin website. I would rather the bitcoin didn't go through my website to prevent any security issues. What happens is one user pays another user, and when that happens my website ...
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18 views

Meaning/Derivation of 32 byte TxID hash

A largely abstract question (set) I've tried to answer for awhile is the nature of a TxID (32 byte hex Transaction ID hash). First and foremost, I certainly understand the main function if this ...
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RippleAPI Prepare Payment Paths object

When using ripple API Prepare Payment method. GET /v1/accounts/{:source_address}/payments/paths/{:destination_address}/{:amount} I am struggling with how should I understand paths part of response? ...
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38 views

Is an unencrypted wallet secure if bitcoind is not accepting RPC calls?

I'm interested in setting up a P2Pool node (which requires running bitcoind) to run a little mining pool for myself. Before you ask, nope I'm not even trying to break even, I know I'll lose money on ...
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How Does Bit Coin Discovery Work? [duplicate]

According to the original paper on Bit Coin transactions are broadcast to a number of nodes as are Proofs of work. My question is if Bit Coin is decentralized how are transactions and proofs of work ...
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Specific instance of Tx using a malformed null byte vector for P2SH; insight req

From Biteasy's API for TXID fccf964964c34994e5dbbb9ff7f914159b524b0831f6eea12255aa424b39090e we can see the following info regarding inputs (for a P2SH Tx): "script_sig_string": "[] ...
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Can one wallet send/receive bitcoins from/to multiple sources simultaneously?

Let's say for example I put my public bitcoin address on a website for donations and multiple people for around the world deposit bitcoins simultaneously to that same wallet: Will all deposit ...
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2answers
88 views

Why can't we expire two year old transactions?

I understand any output in blockchain can be left un-redeemed forever. But If we expire all transactions that are more than two years old (specifically after some number of blocks), there are some ...
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3answers
72 views

Receving donation on a bitcoin address and security issues of reusing the same address

I am running a blog and would like to receive donation from my followers. So I should add a bitcoin address on my Support me page! But on bitcoin.it, it is recommended to never reuse addresses (not ...
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Why can I only see the balance of my wallet and not the one of each of my receiving addresses? (Multibit)

I have some troubles to understand the logic behing addresses and wallets. I use Multibit to manage my BTC. I have one wallet with 5 receiving addresses. I have transfered from an exchange website ...
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2answers
70 views

bitcoin script for a competitive crowdfunding-like contract

I'm curious about how one might replicate the functionality of http://whatbitcointhinks.com/ using bitcoin script. The functionality is that there's a sort of crowdfunding competition between two ...
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1answer
50 views

What is meant by “relaxed standards” for P2SH redeem scripts in Bitcoin Core 0.10.0?

From the Bitcoin Core 0.10.0 release notes: Standard script rules relaxed for P2SH addresses The IsStandard() rules have been almost completely removed for P2SH redemption scripts, allowing ...
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Blockchain.info RPC API and deposit/withdraw problem

I'm using blockchain.info RPC to detect deposits using Node.JS as server, using listTransactions method. Because blockchain.info doesn't has walletnotify api. When processing deposits, there is no ...
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52 views

Clarification of Tx Fees settings in Bitcoincore 0.10

I'm looking for clarification of the new Tx priority and Tx Fees settings (eg fee per kB in the 0.10 version of Bitcoincore. Is the 0.0001 BTC fee deprecated? Why the move towards variable Tx fees?
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29 views

How to extract the signature of a transaction using bitcoinj

I am trying to extract the signatures from a transaction. What is the best way to do this given a com.google.bitcoin.core.Transaction object I just received from the network?
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Is it possible for a person's transaction to show up on the network BEFORE mine if I send bitcoins before him?

To clarify, if person A sends bitcoins to person B, and person C sends bitcoins to person D, 1 second (or less), AFTER person A, can person C's transaction show up on the network BEFORE person A's? If ...
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Best Way to Get Latest Transactions

I'm trying to write a node that listens all the bitcoin transactions in real time. I'm considering two ways of doing this: The first one is to check mempools of other nodes periodically and the second ...
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What do people mean by solving bitcoin transactions? [duplicate]

I have been looking at a lot of posts about how bitcoins are generated. They keep talking about how miners do computations of other "transactions". Do they mean bitcoin transactions or other forms of ...
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Are there Bitcoin addresses with an odd number of transactions?

When I explore the blockchain on blockchain.info, all Bitcoin addresses seem to have an even number of transactions, e.g. 16Zugc8aq9sPkxBYXyYGqJHTizRzT5wTQg has 16 transactions. I have looked at a lot ...
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Using bitcoins JSON RPC, how can I confirm a transaction I published?

I have created, signed and sent a raw transaction via bitcoind RPC. Now I want to wait for it to have n confirmations. Considering transaction malleability, I can't just check the "confirmations" ...
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Transaction with multiple outputs

I have read that entire bitcoins received in one transaction have to be spend in other transaction. The actual amount to be transferred is deducted from the total bitcoins and the change is returned ...
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59 views

Verifying Bitcoin ownership

Suppose Alice has 30 bitcoins from David. Now Alice wants to transfer amount 20 bitcoins to Bob. Now, Alice creates a transaction with Bob's bitcoin address. To prove authenticity and integrity, ...
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122 views

How do I compose a transaction with OP_RETURN in Python?

Currently trying to figure out how to use Python to construct a transaction with OP_RETURN. I tried to encode the message myself, and had no luck. I found a function, OPReturn(), on the internet, but ...
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81 views

Correct Citation Format for a Bitcoin Transaction

When writing an academic style paper where specific bitcoin transactions are used as examples, is there a standard format to "cite" a bitcoin transaction? If not, what do you think an appropriate ...
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18 views

Does the inability to spend only part of a transaction result in “too many” extra transactions?

I understand that I can only spend the amount of a full transaction associated with an address. Often this will result in change being sent to a change address that I provide. One question at this ...
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Multisig vs Multi input transaction signing

Let's say we have a 2 of 2 multisig address that we want to spend from, so the transaction should be signed by both of the private keys. Now let's say we have a transaction with two inputs, so once ...
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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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Intercept and edit 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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3answers
109 views

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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78 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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24 views

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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2answers
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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 ...
4
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158 views

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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2answers
112 views

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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91 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 ...