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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Since the blockchain is public, how can we see it?

The blockchain is a shared public ledger for bitcoin. what does it mean exactly ? It is possible to see, publicly, all transactions ? For every bitcoin a person owns, is he able to see all the ...
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Redeem input script without signature

I am trying to make a strange transaction which can be redeemed by solving a simple math problem, e.g. square root of 2. With the answer the student should be able to unlock the input and claim the ...
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27 views

Refund a transaction send twice

By mistake, I have send second time 0.09923 BTC to bitcoin address: 15qMMPEa4M26XX4KqXxrvD5yjNwfETg3Hx via transaction id:0a5c7ea12bd84b1dfeea4972d6415c28d6846d83c5fb00f56cf4f6d20c05f4da I did the ...
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Can Bitcoin full nodes pinpoint the true source of a transaction which they've relayed?

Assume I'm running a full node and that I've relayed some transactions. As a full node owner, can I pinpoint the true source of the transactions I've relayed?
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Bitcoin protocol: How do I build my block to get the newly generated coins? [duplicate]

I am writing a software to mine bitcoins (in golang) as part of a college project. I'd like to know how is it that I build a block (which would potentially get appended to the end of the block chain) ...
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bitcoin protocol: transaction encoding

I am writing a program (in golang) to mine bitcoins. Supposing I have this dummy transaction, how may I encode it so it can be used in the block im trying to mine? Also, supposing I have a block ...
9
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123 views

Where can I find an average transaction value chart?

I'm curious on what is the average amount of BTC transacted per transaction. I'd basically like to combine blockchain.info's Estimated Transaction Value and Number of Transactions Per Day charts. I'm ...
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Why is the ledger public?

To me, banking is not a public thing. I don't want people to know what's in my bank account at what time, or who I sent money to. I know that I can make a new address for each transaction, as ...
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Why don't transactions store 'account balance'? [duplicate]

I've been reading up on the topic of transactions in Bitcoin, and I don't understand why each transaction doesn't just store 'total amount in this address after transaction'. It's easily calculable by ...
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30 views

Specification of Transaction Inputs - Bitcoin vs Ripple

In Bitcoin, the transaction inputs (UTXOs) are specified as a tuple (transaction index, vout) since there is no notion of an account in the bitcoin system and the address (pointed to by vout) alone ...
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Transaction with Multiple Inputs having Same Address

Why do transactions have multiple inputs with the same address? Is it because the amounts were obtained in the address through multiple separate transactions. Shouldn't the amounts be clubbed to a ...
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1answer
64 views

Smart contracts in bitcoin

Is it possible in bitcoin to start a smart contract preloaded with some amount of money. And if some other user is ready to pay to the smart contract a certain amount of money, the smart contract ...
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Transaction flagged as having a non-standard input

A few hours ago I've sent a transaction which is not being added to a block, and on blockchain.info it flagged as "non-standard input". I've used pybitcointools to create the TX. What is wrong with ...
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1answer
45 views

Can receiving money make a transaction fail?

Scenario: Alice has a wallet A1bz (let's say these are the first 4 characters of the private key in wallet import format so we don't have to deal with too many characters) with wallet address 1A1 and ...
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2answers
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Issue transaction without being online

Is there some way in which User A who could load a transaction onto the block chain and if some other User B who is willing to pay User A, without User A being online could release the loaded ...
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Inconsistent Results with Blockchain Data API

I'm using the Blockchain API library (Python, v1) from blockchain.info available on GitHub. The blockexplorer.py module provides functions for obtaining blocks from the blockchain, specifically ...
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1answer
35 views

Recovering the public key from a transaction

Is it possible to get the public key of a user, if we have a transaction from that User in my wallet ?
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What happens if the transaction interrupted during proof of stake?

Suppose I've few coins for proof of stake, and suddenly my internet connection goes off or power down of my pc, what may happen if a transaction was in the middle, would I lose my coins which were in ...
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What is the largest number of blocks a transaction has ever waited for confirmation?

What is the largest number of blocks a transaction has ever waited before eventual confirmation? Please exclude: Transactions with no fee Transactions delayed because of unconfirmed inputs ...
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104 views

Making money with bitcoins [duplicate]

I heard stories of people on the Web making money with Bitcoins. I heard the term "mining", with bitcoin mining, but I don't really know how it works. Can someone explain to me the process and what ...
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First confirmation time vs miners fee's

After submitting a transaction to the blockchain.. 1) If I pay a higher transaction fee will first confirmation happen faster? 2) I found today that a 250B transaction with 1000 Satoshi fee took ...
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3answers
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What is the most expensive Bitcoin purchase ever made?

Relying only on publicly disclosed data, what is the most expensive Bitcoin purchase that has ever occurred? "Expensive" can be determined either by: Highest purchase price in Bitcoins Highest fiat ...
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1answer
48 views

How is a transaction's output signed?

I m a newbie. I did search for answer to similar question. My searching was unsuccessful. In a transaction Tx, the hash pointer of the earlier transaction (say TxE) that serves as input to Tx must ...
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Transaction with `OP_RETURN` to a particular address

How do I formulate a Transaction with OP_RETURN to a particular address using Bitcoinj library. SendRequest req; Transaction transaction = new Transaction(Main.getNetWorkParameters()); ...
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Sharing the Master Keys in BIP32

What is the Best way to share the Master Public Key and Master Chain code generated using BIP32 in Bicoins with a user that I don't trust ? I just want the second user to monitor my wallet and not ...
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42 views

Transfer from Bitcoin Core to Electrum expired before full synchronization. Where are the bitcoins?

I started using Bitcoin Core and transferred coins to this wallet. When synchronization got to the point where the coins showed up in the wallet I sent them on to an Electrum wallet, although Core had ...
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Do we get paid by the IP? Or is the address?

Do we get paid by the IP? Or is the address?
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Whisper Implementation in Bitcoin

Is there some kind of implementation in bitcoin to communicate between nodes, which is similar to the Whisper Communication in Ethereum ? Whisper, is a communication protocol for DApps to communicate ...
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How to get the Public Keys of a bitcoin User

Is there some way in which I could get the public key of a Bitcoin user ? Lets say I have transaction with another Bitcoin user. Is there some means by which I can retrieve the public key of the ...
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2answers
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How can I choose the address bitcoins are sent from?

So let's say I have multiple bitcoin addresses (some of them already received bitcoins), created a new bitcoin address, received bitcoins on it and would like to use the very same address to send them ...
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0answers
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Bitcoin sending transaction error

I recently bought some Bitcoins(around 0.5) and sent some to a friend. He got them direct. Today I wanted to transfer some more but it didn't work. Every transaction was an error, besides one very ...
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1answer
66 views

Why do websites such as satoshimines and bustabit generate new addresses every time?

Why a single address for each user not enough? Can't they just verify the incoming transactions? If I want to mimic this practice, how can I generate unlimited addresses, from which transactions can ...
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Streaming API for confirmed transactions?

Is there an API that makes streams transactions as they're confirmed? Everything I can find seems to just be putting out unconfirmed transactions in realtime, rather than waiting for confirmation. To ...
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transactions for future use [closed]

If bitcoins can be stolen via hacking, what's there to stop these already occurring events and bitcoins from falling right back into the hands of power. I mean bitcoins are capable of being ...
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getting bitcoin address of blk*.dat files

I know that getting the address from the blk*.dat files is discussed a lot of times. But I don't get it why? When I have the raw scriptSig I can encode it and get the bitcoin address or not? E.g. the ...
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I have a stuck transaction (2 days already) [duplicate]

I have this transaction : https://blockchain.info/tx/8fdb3e8a0a33b3d1721b6ef7c1c2608b1e1a8aacd8857e22287b120c09ee988a I understand it's stuck because of the low value i spended but look at the fee. ...
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1answer
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Sharing BIP32 extended master public key

I have User A who generates BIP32 Master Public and Private Keys. They share the Master Public Key with User B. Using the Master Public Key User B generates Address of A and sends bitcoins from ...
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2answers
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Is it possible to combine two separate transactions into one transaction by only using their signatures?

I have two valid txs and two valid signatures for those txs. Right now they look like: 1) A -> B 2) C -> D A and C are inputs & B and D are outputs. I want to be able to combine them ...
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Using funds that have not been completely transferred yet for a new transaction

What happens if I start a new transaction with funds from a transaction which isn't 100% complete? Let's say, the incoming transaction shows 2/3 of the green dot, but the sum is counted as full by ...
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Get transaction details using bitcoinj library

I am trying to develop an application using bitcoinj library. I want to get the bitcoin transaction details. The details, that I want to extract from a transaction includes the following. 1) Who ...
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2answers
78 views

Would moving a transaction from an old block to a new one allow more pruning?

At Pruning the branches in Merkle Tree Nick ODell writes "A leaf (transaction) can be pruned when all of its outputs have been spent." So I was thinking that if a transaction is one of the last few in ...
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2answers
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Wasted satoshi due to transaction fees

Say I have a wallet containing 1000 satoshi, and I want to transfer this to another wallet, but it doesn't cover the transaction fee, do I just waste it? I don't have the private key to the wallet ...
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1answer
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Can you search a transaction by quantity?

I have been looking and I cant figure out a way to find a recent transaction by quantity. Let's say I know someone sent "x" amount of BTC but I don't know who was the sender nor the receiver, this ...
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1answer
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Transfer Not Sent to wallet

I request payment to this address: 1MJW5uSqvsdey6DnAsMo21WZ6bhehaVtKq but still not yet to the wallet. https://blockchain.info/address/1MJW5uSqvsdey6DnAsMo21WZ6bhehaVtKq Why this happen how to get ...
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1answer
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Will Bitcoin remember unperformed transactions?

Let's say I transfer 0.05 BTC from 1 input to 1 output and don't pay a fee. If there are 6 blocks per hour, this means that my input has to be 369 hours (about 15 days) old so no fee is required. Let'...
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2answers
101 views

Double Spending before confirmation [duplicate]

What's to prevent someone from using bitcoin at a store like subway and double spending to buy the sandwich before a confirmation is made? Since subway obviously isn't going to wait for a ...
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1answer
61 views

How to pratically doublespend bitcoins?

I tried to put bitcoins into an p2p exchange with bitcoin-qt. I added a to small transaction fee, so the coins are now stuck as "Unconfirmed". The offer from the exchange is overdue, so all that will ...
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How does tx fee calculation work when txin and txout are similar amounts?

This website has an example called "When Too Much is Not Enough" on its main page. I'll quote it an case this is changed in the future: Suppose you have only two outputs in your wallet, worth 1 ...
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Code change to create TX for send between local addresses

Need to create a customised client to be able to create TXs on the blockchain when sending between local addresses. This can be done with Coin Control but needs to be done with a headless daemon. I'm ...
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Bitcoins transactions over 1000 confirmations, but amount remains red

I'm newbee, I did several payments about 14 days ago. There are 618 confirmations, but the amount remains red and nothing happens. See the example of my blockchain wallet and 4 more examples. The ...