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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Restrict the Bitcoin usage only during a particular period

I would like to know if its possible to use a Bitcoin at present in the following scenario. When I send a Bitcoin to an another user,I set certain parameters on the Bitcoin, like it can only be used ...
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2answers
22 views

can man in the middle change transaction before its broadcast?

i'm very new to bitcoins (started learning it today). i hope i get the question right: i understand when a transaction is created, using my private key i sign the transaction, but i also provide the ...
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1answer
13 views

How to use JSON-RPC in C++ in Linux?

Which library I must use for JSON? Where is RPC call example ? How to use RPC of bitcoind or bitcoin-cli? or better Electrum API to get all new (maybe pending) transactions which appears in Bitcoin ...
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2answers
38 views

Is blockchain necessary?

I am interested in developing a crypto-currency (who isn't), but I have no interest in the blockchain mining aspect of it. I want to program one that emits the coins when someone has performed some ...
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1answer
13 views

How to apply RBF (Replace-by-Fee)

I got a stuck transaction and would like to clear this. I found many information about RBF (Replace-by-Fee) how it works etc. So i think this might be the best option to get my transaction going. ...
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1answer
34 views

Please help. BTC has left Armory wallet and shows as gray, but says “Not in the blockchain yet”

I sent 1.5BTC in the usual way from my Armory wallet, but the transaction shows in gray as if it is still pending. When I click more details it says "Not in the blockchain yet". If I search for the ...
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1answer
74 views

I bought 1BTC and the transaction was instantaneously, how?

So, I went to localbitcoin, I met a random guy at a Starbucks gave him the money and he transfered 1BTC with his cellphone to my blockchain.info account. I thought I would have to wait at very least ...
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1answer
83 views

Can a transaction have more than one recipient?

I am quite new to Bitcoin. I have a doubt. Let's say I, person A, have 1 bitcoin. I want to send 0.5 BTC to person B and 0.5 BTC to person C in a single transaction. Is it possible to do so within ...
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23 views

Transaction ID not found- Status still unconfirmed

I tried to make a transaction back to my bitstamp account on 23.02.2016 but it has not been received. the Transaction ID from Bitcoin Core is the following: ...
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0answers
41 views

What would need to happen for someone to be able to steal my Bitcoin balance?

As the brute force way is mathematically nearly impossible, I ask about the way of obtaining those keys. How can an attacker obtain your keys, and how can you protect yourself? For example, mining ...
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0answers
36 views

To what end do miners typically put “nonstandard” transactions

I'm reading Franco's book "Understanding Bitcoin" and greatly enjoying it. Simultaneously I'm tailing a node log file. I notice the plethora of "nonstandard transaction: non-final"s. Franco says ...
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1answer
49 views

How does bitcoin handle extreme transaction volume?

What would happen if the amount of active Bitcoin users grows up enough so that the average rate at which transactions are created becomes faster than the average rate at which transactions are ...
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1answer
36 views

My first transaction using Bitcoin-Qt

I used Bitcoin-qt (Bitcoin Core) on desktop to create a wallet a while ago and I'm a little confused how it works. I never fully "synchronized with the network" I'm assuming that means download the ...
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1answer
28 views

Is it possible to Send the total balance of Bitcoin from the Wallet using rpc without having to specify the exact amount?

I know we can send coins using the move, sendtoaddress and sendfrom commands from the console or commandline. However these commands require to specify an "exact" amount, meaning you need to check ...
3
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1answer
52 views

Why are all redeem scripts standard, but only a few pubkey scripts?

As I understand it, only transactions with pubkey scripts conforming to a certain pattern are considered "standard" and are relayed, however a script is also considered standard regardless of its ...
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3answers
83 views

How Bitcoin handles addresses collisions?

Since the addresses are hashes of a public portion of a public/private ECDSA keypair, what would happen to two different people with different keys that hashes into the same address? How would ...
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1answer
40 views

Second, Third, Etc Confirmations taking a long time, why?

I have sent a bitcoin transaction of 0.18, you can see it here. https://live.blockcypher.com/btc/tx/22bacef7d4fb78e4e90cd04540daad257a39cb4ab4510f9e0efe5a88efaf0f87/ I included a fee of 0.002 even ...
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1answer
22 views

Electrum and public note

Is it possible to attach a public note to transaction using Electrum client, if yes so how ?
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1answer
30 views

When I use the “send_many()” function in the blockchain.info api, have I to pay the fee only once or for each?

The blockchain.info api looks like this: The link is: https://github.com/blockchain/api-v1-client-python/blob/master/docs/wallet.md But when I give a fee like this: ...
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1answer
53 views

Transaction ID not found- Status still unconfirmed after a month?

I did a transaction back to my bitstamp account on 23.02.2016 but it has not been received. Transaction ID: 1886e0c49ba43a842043fc84358a05d3faf69468c1547e1d2ef3e030b929f834 I do have the blockchain ...
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2answers
74 views

How can I send thousands of small amounts (10'000 sat.) to bitcoin wallets without paying to much fees?

I want to make a faucet. But my problem is that I don't know how I can make my payouts. I would have a lot of little amounts (like 10'000 satoshis) to pay. Is there an efficient way of doing thousands ...
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2answers
100 views

Safely buying bitcoins in person

What is the safest way to exchange bitcoin for cash in person. Obviously meet somewhere public but other then that how should an exchange proceed? What steps should be taken to ensure both parties ...
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1answer
57 views

Blockchain.info send may transactions API v2

I'm currently using v2 of Blockchain.info's API and am wanting to utilise "Send Many Transaction" and am having some issues. I have 1 wallet with many addresses, I am trying to send 2 transactions ...
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1answer
48 views

How are bitcoins reassigned?

How are bitcoins reassigned, that is, what about a transaction makes a "coin" no longer usable by the sender, and makes it usable by the recipient? Alice wants to send bitcoins to Bob. Alice's wallet ...
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1answer
29 views

Multiple addresses in transaction

I am a total noob, so this might be a stupid question. I was looking at this transaction, and saw multiple inputs and outputs. ...
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1answer
28 views

When I pay, how is my balance checked, if I use different address every time?

I know there are quite similar questions, but none have addressed my issue. Let's say I use Electrum wallet, that generates addresses & keypairs from seed. So for every next transaction I use ...
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5 views

Transaction outputs [duplicate]

When I have a wallet with 3 addresses addr A: 2 BTC addr B: 3 BTC addr C: 4 BTC and I have to send someone 6.5 BTC Will the wallet use addr B+C as output for a new tx or does a wallet always use ...
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1answer
70 views

Unconfirmed transaction for nearly 3 months

Sorry but I am fairly new to this. I have qt wallet and have done quite a few transactions, but around Xmas time I placed a few payments that didn't go through. After checking the web, many said just ...
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1answer
32 views

Is there any way to make a transaction invalid if it is not confirmed before a certain block?

It seems like it would be useful to avoid replay attacks if your wallet could specify that a transaction must be confirmed before say the (current+100)th block before broadcasting it I guess there ...
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0answers
42 views

How is transaction fee calculated?

Some says that transaction fee is calculated based on the size of transactions. In short, does it mean based on the number of utxos? To be precise, does it mean depending on the size of all of input ...
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1answer
82 views

Why did Bitcoin Core wallet send my coins to this address?

Yesterday evening I installed the Bitcoin Core wallet (v0.11.2 (64-bit) from the Chocolatey repo to my Windows 10 machine). I had some coins in an old wallet.dat that I copied to the data directory. ...
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3answers
215 views

How would you end up with more than two transaction outputs?

I saw a Bitcoin transaction that has 6 inputs and 4 outputs. I understand that several inputs are sometimes used in order to meet the amount requirements of the output. As a result you have two ...
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26 views

A transaction with a decent fee isn't getting confirmed

I have sent a transaction but it seems like it isnt being confirmed. I have also added a decent fee. https://blockchain.info/tx/f18eb6a4a148bae01a1a6da408f6d1a2f190881de0eb0578fcf2447c0b520715 Also ...
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3answers
182 views

How to check Bitcoin wallet balance without any API

I am building an application and that will involve large set of bitcoin wallets and need to keep on checking for balance. I don't want to use any third party APIs as they all have hourly/secondly ...
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1answer
22 views

Solving block with number current number of transactions

I'm trying to analize getblocktemplate that is returned by Bitcoin Core. If I'm not wrong that data that is returned contain all required data that I need to start mining. But what about the list of ...
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3answers
63 views
+50

Is there a way to create a transaction that it can only be confirmed after another unrelated transaction has been confirmed?

Is there a way to create a transaction A that cannot be confirmed until B has been included in a block, although A does not build on any UTXO B creates? B would have already been broadcast by another ...
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1answer
35 views

How to get fee in a transaction with unconfirmed inputs in bitcoinj?

I am trying to get the fee of incoming transactions in a wallet with bitcoinj. At times it was the commission using Transaction.getFee(), but this was throwing NullPointerException. I got to do a ...
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3answers
324 views

Why does the “global lottery” prove the validity of the blockchain?

As far as I understand it currently, when winning the "lottery" (mining) you can add a block, sum of transactions, to the blockchain. This block is in the first instance verified by all network users. ...
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3answers
78 views

What makes a trusted source trusted?

I know that the blockchain technologie works so well, because everybody has basically a copy of the last ledger. Therefore, if a transaction happens, everybody inside the network has to "approve" the ...
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1answer
58 views

How would an atomic exchange of assets be implemented in a blockchain?

There are non-Bitcoin blockchains being created at the moment that are used to trade and transfer assets. It is my understanding that on such a block chain there are "tokens" representing assets such ...
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0answers
28 views

did this transaction go through? [duplicate]

sorry if this is a dumb question but i just attempted my first transaction and i think i could've messed up. I clicked request, copied the address (closed the tab) then i just bought bitcoins for that ...
4
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1answer
60 views

Transaction overriding in lightning network

I'm reading the lightning network whitepaper, and at some point it states this: Therefore, it is possible in bitcoin to devise a bitcoin script whereby all old transactions are invalidated, and ...
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2answers
106 views

Bitcoin Core extremely high syncing time

I'm running Bitcoin Core wallet on a gaming PC with a GTX 750ti, and 3.7ghz quadcore processor, and 16gb of ram. My internet download speed is 15 116mbps via hardwire. But for some reason the syncing ...
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1answer
70 views

Is there any way for me to recover or reclaim a confirmed but unspent transaction that was sent to the wrong address?

I sent money to the wrong address. I am not a developer and I only understand the blockchain in its most general terms.....but I use bitcoin everyday so I have a working knowledge of it. It's hard for ...
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2answers
1k views

Who mined the infamous block 364422?

Block 364422 contains a transaction that takes a long time to verify. This transaction design demonstrates a way a denial of service attack could be executed. This prompted Gavin Andresen to propose ...
3
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1answer
26 views

Why do we need CCoins in addition to CTransactions?

As per my understanding CTransactions represents the atomic unit in Bitcoin. It has the inputs CTxIn and outputs CTxOut. Can any expert give the intuition of why we need CCoins in source code ? Why ...
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20 views

What does it mean? [duplicate]

https://blockchain.info/ru/block/00000000000000000233ba0eca74198e0152b91c75d082d6240497b2bacd0aa9 https://blockchain.info/ru/block/000000000000000001879f26997dbc9e69c6edffc144ea5d2eda3d802f200919 ...
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2answers
103 views

Find private key

I have 2 transactions. ...
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1answer
88 views

Bitcoin core stopped sync'ing (without downloading all the data). How can I make it resume the synchronization?

I really need your expertise guys. I am extremely new to this concept but just decided to try. Unfortunately I did not do my homework before playing with my money. I bought some coins and I sent them ...
4
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1answer
54 views

Does every full node verify every transaction TWO separate times?

I am building my Bitcoin expertise, and want to verify my understanding on a specific point: at what point(s) do all full nodes verifies a new transaction? Here is my understanding in a nutshell, ...