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 is the maximum output addresses I can send to with one bitcoin transaction?

I'm looking to make a faucet website, but was wondering what is the maximum output addresses one can do with on bitcoin transaction?
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16 views

Is it possible to make transaction with 2txin and 2txout?

Question as in the header. If it is possible, then how to sign this transaction? Or do I have to create two separate transactions? 1txin 1txout and 1txin 2txout?
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61 views

I made this flowchart on bitcoin exchanges. What do you think?

To briefly explain: Pretend a bitcoin user spends a bitcoin to purchase a product at Overstock.com. As BTCs are volatile and not ubiquitous like USD, Overstock.com doesn't want to hold onto them. ...
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2answers
65 views

What's the point of trading BTC if you're limited in the things you can buy

If you're trying to make a profit by trading BTC... fine, I get it. What other reasons are there to trade BTC?
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28 views

Is there an API that provides this functionality?

Sorry I couldn't make my title more descriptive, but it might be a little long winded. What I need is the following, and preferably an API that can support the popular crypto currencies, not just ...
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1answer
49 views

Is it possible that someone forks the chain?

I'm not sure I understood everything but all the clients always keep the longest chain, ok. So, what happen if an evil person inject bad transactions in a block and successfully mine it (given the ...
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1answer
54 views

Confirmation limit

When seeing transactions I see that the number of confirmations keeps increasing without any limit. I wanted to know if there is any time limit on including a already confirmed transaction in a block ...
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1answer
22 views

Bitcoin-qt transaction not initiated by the wallet owner

I was just mining for some Dogecoins with Eobot and parallel I had BGFminer set on solo mining + 4 pools from eclipse. The issue is that the moment the Eobot kicked in (it started on mining Dogecoins ...
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I cannot see the expected OP_CODE in transactions

According to different answers on this site the format of the standard TX claim script should be [OP_PUSH DER(R+S)+HashType OP_PUSH PubKey] The OP_PUSH code is 4C, 4D or 4E depending on push length. ...
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32 views

How to send money using blockchain API?

I am not very familiar with php but I just want to know how this works. I am trying to use the blockchain API to send some money for testing purposes but the transaction isn't taking place. My current ...
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1answer
15 views

Ripple - how to properly set flags?

At the moment I'm trying to add flags to my custom Ripple transactions that I submit through JSON RPC. However, when I send my request: { "id":1, "method":"sign", "params":[ { ...
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2answers
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How to schedule a bitcoin transaction?

I just wanted to know if you could schedule a bitcoin transaction. For example I want to send some BTC to someone exactly at 4:00 pm but it is 1:00 pm at my current place. Is that possible so that my ...
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How to install python-bitcoinrpc & btc-update.py

how to install python-bitcoinrpc & btc-update.py on my VPS server? (Bitcoin node) In code I see this: access = AuthServiceProxy("http://RPCUSER:PRCPASSWORD@127.0.0.1:8332") (5th line) What I ...
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1answer
24 views

Explanation of what an OP_RETURN transaction looks like

How is OP_RETURN used and why was it introduced in the first place?
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1answer
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I sent bitcoin from my qt wallet while it was unsynced to another wallet, do i have to wait for it to sync?

it says it has not been broadcasted yet with 0 of 6 confirmations. My wallet is stuck on a block right now.
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1answer
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Harvesting transaction fees

So let's assume I don't care about energy consumption and mining the famous reward for discovered block. Is it possible to set up a workstation optimized to harvest just the transaction fees? Do I ...
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25 views

Standard Transactions and relaxation rules

We all know that there 5 common types of Standard transaction scripts. My question is if we create a script under what rules is it decided if it standard or non-standard? Under the hypothesis that ...
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1answer
33 views

Blockchain and Bitcoin client difference of amount

I just made a transfer of 0.06 BTC, you can look it up on Blockchain.info The problem now is that my receiving client (Multibit) doesn't show those 0.06 BTC, it only shows 0.0001 BTC have been spend ...
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2answers
31 views

How to properly use PreviousTxnID in a Ripple Transaction?

At the moment I am implementing a transaction overwriting with NOPs in Ripple. I want to store information about a transaction I am overwriting inside of the NOP. Looking at the PreviousTxnID field it ...
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1answer
41 views

Bitcoins being sent to another addres during a transaction

I realized a few days back, that if I send some bitcoins to someone, then it shows in blockchain an extra amount sent to my own wallet. So if I send 0.5 BTC from wallet A to B then blockchain shows ...
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1answer
49 views

Can you assume that all inputs to a Bitcoin transaction are controlled by the same person?

When you are looking at a Bicoin transaction in the block chain and it has inputs from multiple addresses is it safe to assume that those addresses are all controlled by the same ...
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2answers
44 views

What does it mean to have -1 confirmations?

I have -1 confirmations for an inbound transaction on my Electrum wallet. What does is it mean to have -1 confirmations?
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1answer
13 views

Can a Ripple Transaction Sequence have gaps?

I am wondering whether a Ripple Transaction with a Sequence number that ships over a few numbers from the previous Sequence number be accepted as a valid transaction in the Ripple Network? For ...
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1answer
46 views

Are there any tools to visualize where the transactions are coming from and going to?

We spent some time doing the visualization of the transaction flow between bitcoin wallets https://bitviz.visalyze.com and wanted to know if there are any tools that can not only track, but also ...
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How does Core distinguish between confirmed & unconfirmed Tx in memory?

Looking for a low-level answer, links to reference code would be helpful: Is there a difference between a Tx message received from a peer, and a Tx item as included in a valid block received from a ...
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1answer
26 views

Create custom Transaction ID using Bitcoind raw transaction

I would like to know if it's possible for someone to create a raw transaction using bitcoind or bitcoinJ and predict the Transaction hash.How exactly is the transaction ID(hash) calculated ?
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How is a Transaction Output Marked as Spent?

The Bitcoin developer guide states that each output of a particular transaction can only be used as an input once in the block chain. Any subsequent reference is a forbidden double spend—an ...
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48 views

Where do transaction fees go in block #163368

The reward of the Coinbase TX is only 50 BTC not including transaction fees. So who owned these fees?
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33 views

How long should confirmation (spendable amount) take?

My transaction already has 24 confirmations at blockchain.info, and the transaction is correctly recorded in Multibit. But there is no "spendable amount". I've already "Reset Blockchain And ...
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1answer
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Nulldata transaction information

Can someone give more information on that type of transaction? Why is it useful for the network. Can it be claimed since it has OP_RETURN command?
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1answer
37 views

What new transactions are possible with 15 operations?

Today Gavin tweeted that he's relaxing the IsStandard rules for pay-to-script-hash transactions to allow any transaction with 15 or less operations. (Full git commit here) When this is merged and ...
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2answers
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Double spend transactions flag the node as “bad”?

I'm playing with raw transactions. It's easy to send two signed valid transactions at the same time from the same output to different addresses (making a double-spend attack). My doubt is: if I make ...
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1answer
46 views

What determines how many transactions end up in a given block?

What determines how many transactions end up in a given block? Blocks can have various numbers of transactions, so what decides how many are in a certain block?
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Supermajority to prevent 51% attack?

I would think that amending the bitcoin protocol to require a supermajority, say 60% or 75%, to verify proof of work help reduce the risk of a 51% attack. If this is so, what are the major obstacles ...
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Coinbase lost my transaction from Bitstamp

I'm moving my coins out of Bitstamp I was looking for another exchange. I have sent 0.00007 BTC to just test the transaction. I got the address where I want to send coins to from ...
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1answer
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Advanced Bitcoin Transactions

Let's say that 7 users want to spend money from a Bitcoin multisig address. The approval of funds from this address requires the signatures of A (the leader), either B or C (two managers), and 2 of 4 ...
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nLockTime transactions, how do they persist? Are they broadcast before they are valid?

If nLockTime transactions aren't added to the blockchain until the nLockTime is met, then aren't they just being stored in memory of the miners and is there a risk they could get "lost"? I guess I'm ...
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Miners produced/ing duplicated hash values

This transaction is contained in two MainChain-Blocks: https://blockchain.info/tx/e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468 On Blockexplorer there is a note of this anomaly: ...
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1answer
29 views

How to find a block containing a transaction using transaction hash only?

Well, the title says it all. I have a transaction hash and I want to find this transaction in the blockchain. I am working with bitcoinj. I am probably missing something very obvious here, but I ...
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How to get value of script?

I would like to count script step by step, but I have problem with it. For example, I have such transaction: { "locktime": 0, "txid": ...
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1answer
33 views

Bitcoin Transaction within sourcode

I am messing with the Bitcoin sourcecode. Normally when you want to send some BTC you type : ./bitcoind sendtoaddress 1ADRESSS 0.001 How would you do this in the sourcecode on a recurring basis? ...
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2answers
61 views

Let receivers pay transaction fees

I want my customers to pay transaction fees. The only helpful but incomplete answer I have found so far is from here: You can create a transaction which spends the output to yourself, attaching a ...
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1answer
82 views

Calculate tx fees before sending with sendtoaddress

I see this question time and time again, but I only find answers for calculating the fees in creating raw transactions. I am using sendtoaddress and would like to be able to calculate the tx fee ...
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1answer
43 views

How can I get the block number of given transaction?

For a given transaction, I have its incoming transactions and I am trying to get the number of the block of those transactions. This seems like something that cannot achieve directly. I am working on ...
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1answer
55 views

Why is it possible to have multiples addresses in an output of a transaction?

I am trying to load the blockchain into a MySQL database by using the data gathered from RPC calls to bitcoind. I am wondering why the "addresses" key within the "vout" array of a transaction is ...
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1answer
124 views

How the arbitrage works?

How the arbitrage works, Is transaction fee is included for calculating arbitrage across exchanges, cryptocoincharts seems to render incorrect values, Any other arbitrage available at open source? ...
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31 views

Extracting information from utxo for offline processing

I would like to extract as much information about the utxo set (all unspent transactions) up to a given block height, including value and scriptpubkey. This information is meant to be inserted into ...
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53 views

How to find utxo?

I might be over thinking this, but I'm trying to figure out the best way to build an unspent output pool. Should I just naively parse every block? Every input gets removed from the hash set, and every ...
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2answers
100 views

Is there database of orphaned blocks?

Is there database of orphaned blocks? https://blockchain.info/orphaned-blocks does not work right now Does anybody keep them? Also I am looking for those transactions which were not included in ...
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1answer
42 views

Multisig with same keys

is it possible to make a multisig tx with the same keys ? For example, i got: Key A, Key B, Key C Now A should be able to spend the coins and also B with the help of C. (B and C alone should not be ...