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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Is it possible to reject a bitcoin payment?

Say someone sends bitcoin to an address. It is later determined that those incoming funds are tainted and the recipient wants no association. What is their recourse?
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sent-to address

Premise: I'm quite new to all this bitcoin thing. After experiencing some problem with a bitcoin transaction, I made few attempts with small quantities (0,0001). In particular, I've sent 0,0001 to ...
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28 views

Using Bitcore API for Escrow

Has anyone experience using the Bitcore API for Escrow purposes with node.js? I assume, you'd need to create a new a address, then somehow create a new transaction using the newly created address, ...
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Someone with knowledge in bitcoin transactions needed. I'll pay in bitcoins [closed]

Trying to set up an e-shop with an option of getting paid in bitcoins. I need help to sort a couple of things out. Any help will be much appreciated, I'll pay in bitcoins for your support. Contact me ...
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2answers
28 views

How to get the input address from an txid with bitcoind

I want to get the input addresses of a transaction with a known id. If I use getrawtransaction I get something like: "vin" : [ { "txid" : ...
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1answer
24 views

How do SPV get their transactions after being offline?

SPV nodes rely on their peers to send them transaction data that is relevant to them. When an SPV node sets up a bloom filter with one of their full node peers, doesn't that only tell the full node ...
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1answer
12 views

What is A matching transaction in the pool validation?

I'm reading "mastering bitcoin" and got into transaction validation. Can you explain to me what is the meaning of "A matching transaction in the pool, or in a block in the main branch, must exist." ?
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2answers
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If Bitcoin is traceable, how bitcoin scams are exist?

Let me write an example. A hustler give some people his bitcoin address and these people transfer some bitcoins to his wallet. According to the term, which says that bitcoin transaction is traceable ...
7
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2answers
95 views

What technical reasons exist for off-chain transactions?

I'm trying to get a grasp on off-chain transactions, as they seem more common than I initially realized but they are not the way that I originally perceived bitcoin being used as an outsider looking ...
2
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1answer
48 views

Is it possible to change an output of a partially signed transaction?

In step 5 of the procedure described in https://en.bitcoin.it/wiki/Smart_Property#Theory, the buyer creates a partially signed transaction. Will the seller be able to change an output prior to signing ...
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1answer
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transfer Bitcoin without synchronizing Bitcoin core

I installed Bitcoin core recently but its not synchronizing right now. I sent one address from file menu like this below to one of my friend and he is send me some Bitcoin ...
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1answer
22 views

How 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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2answers
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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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35 views

Unable to receive/preview funds due to un-synced wallet [duplicate]

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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1answer
32 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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2answers
40 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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1answer
45 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 ...
0
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1answer
21 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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1answer
17 views

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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2answers
49 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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0answers
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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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2answers
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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 ...
2
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2answers
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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
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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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1answer
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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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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
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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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1answer
64 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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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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1answer
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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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63 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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149 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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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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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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2answers
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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 ...
3
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2answers
88 views

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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2answers
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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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1answer
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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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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 ...