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 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 ...
6
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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 ...
2
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1answer
18 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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0answers
20 views

What does it mean? [duplicate]

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

Find private key

I have 2 transactions. ...
1
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1answer
41 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
42 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, ...
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0answers
11 views

Pay to Script Hash Execution

Combining the spending transaction scriptSig and funding transaction scriptPubKey, we get: <OP_0> <sig A> <sig C> <redeemScript> <OP_HASH160> <redeemScriptHash> ...
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0answers
31 views

blockchain transactions dump file

I am looking for hourly, daily, weekly, monthly and yearly blockchain transactions dump in csv or other formats. Any pointers would be really appreciated.
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1answer
27 views

How can I pay someone in another country?

I have my wallet with some BTC in it, on my PC, and I live in europe. Let's say I want to pay 2BTC to a company in India or China, or whatever, but they don't accept BTC. They only take Indian Rupees ...
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1answer
34 views

Why scriptPubKey is a series of commands?

I am not fully understanding the design purpose of the scriptPubKey in the transaction output. I think the tx's (say tx1 here) output could just be the receiver's public key's hash. Then when the ...
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1answer
23 views

Funds still showing in old Armory wallet/address after being sent+confirmed to new Electrum one?

I'm having a bit of an issue that I'm sure someone more knowledgeable will be able to clarify. I've had an old wallet using the full node client "Armory" for a few years, with 0.2 BTC within that ...
2
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1answer
24 views

How to derive the 'addresses' field on an output from a serialized tx

I'm trying to figure out how to derive the addresses field from a serialized tx. Take for instance this transaction on the test network ...
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2answers
79 views

Is that safe to expose public key to the mainnet

Because every time when someone want to spend some money under an address, he need to provide public key and sent the content to the mainnet. (Please correct me if that is not correct) Where can I ...
1
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1answer
26 views

QT to Core wallet

I have Bitcoin core wallet synced, my original wallet was bitcoin QT version 0.7. My Bitcoin QT wallet never synced and i tried receiving my bitcoins. Now that bitcoin core has synchronized how do I ...
2
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1answer
43 views

Why blockcypher send transaction is throwing fatal error?

I am trying to send bitcoin implementing blockcypher API, but having difficulty in using the following code snippet... i. ...
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1answer
33 views

Is there a way to force fail the transaction in testnet network

I would like to test my application with all the edge cases. Could you please tell me is there a way to force fail the transaction in the testnet blockchain so I can test if my application handles ...
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0answers
23 views

Creation of <20-byte hash of redeem Script> in a P2SH Transaction

According to this example: Redeem Script: 2 PubKey1 PubKey2 PubKey3 PubKey4 PubKey5 5 OP_CHECKMULTISIG Locking Script: OP_HASH160 <20-byte hash of redeem script> OP_EQUAL Unlocking Script: Sig1 ...
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0answers
16 views

Creating the Pay to PubkeyHash Transaction with bitcoinj

I want to implement the Pay to PubkeyHash Transaction without connecting to a network(for example testnet). I want to create it, to run locally. I don't know how to create my Signature from my ...
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1answer
39 views

I cannot send btc before my last transaction get confirmed

I store all of my btc in one address (say from_address), and when I want to send any btc to any address (say to_address) I get a transaction like this: INPUTS: from_address OUTPUTS: to_address and ...
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2answers
51 views

Is it computationally feasible to find two transaction IDs with the same first 20 bytes?

Transaction hashes uses sha256, so they are 32 bytes long. If I have to store a very large database of transaction hashes, only for the purpose of checking existence later on, is it really necessary ...
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2answers
40 views

Will an attacker's forked branch of block chain be used in bitcoin confirmation?

From what I understand, transactions are agglomerated into a block, proof of work is done by computing a hash value for the block, then added to the block chain. When a block is added to the block ...
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0answers
7 views

Unconfirmed transaction after 1 day [duplicate]

Yesterday I sent approximately 0.81 bitcoin ( worth 375 USD) and almost a full day has gone by with out any confirmations. Here are the corresponding addresses ; ...
0
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1answer
43 views

Dog identifier in blockchain

I would like to print qr-code with transaction that contains my home address to print it for my dog's necklace. If dog will get lost everyone can scan it and get the address. How can I prepare the ...
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0answers
24 views

Retaining Ownership of an 'Approval' Indicator Coin

I want to use some form of crypto-currency/blockchain algorithm to represent the notion of "endorsement", in the sense of approval. One approach is to have a coin that you can give to a recipient, ...
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1answer
55 views

Does a transaction with a lock time need more time to be confirmed?

I've made this transaction in the testnet: https://testnet.blockexplorer.com/tx/2f18c646a2b2ee8ee1f295bb5a0f5cc51c5e820a123a14b0c0e170f9777518bb It's a multisign tx with locktime. The locktime has ...
0
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1answer
35 views

How out of block chain transactions work, and is there any API for that?

i wonder how out of block chain transactions work, because till i know it happens but "is not recommended" (it is what i read on the internet), i want to manage some micro transactions but as it is ...
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1answer
31 views

Can Bitcore decode a raw tx?

I have a serialised transaction in raw hex format that I want decoded in JavaScript. Can Bitcore do that for me?
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2answers
71 views

Bitcoins never showed up in wallet. Yet sender says transfer complete

I've used a site called bit trade australia to buy and send bitcoins to a wallet on blockchain.info. Successfully three times this month, trusted too. Yet this time (after receiving an email from ...
1
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1answer
30 views

Why can't a transaction be redirected after it is signed? [duplicate]

Scenario: Step 1: User-1 initiates the TXN-1 to pay to User-2 and the TXN is not yet confirmed with the ongoing block POW. Step 2: What prevents fraudster (anyone a miner or someone ...
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1answer
59 views

How do I build bitcoin transactions graph?

I'm using blockchain dumps from http://dumps.webbtc.com/ in database schema in mentioned that result of script in pk_script should specify recipient of transaction. But how do I get amount of bitcoin ...
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1answer
30 views

Get transaction fees per transaction via gettransaction

For a research project I need to analyse all transactions that happened in 2015. All I care about are volumes transacted, fees paid and a timestamp per transaction or corresponding block. Getting ...
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0answers
63 views

blockchain.info php api

Hello I am new to this block chain environment,but i am currently working on project which requires blockchain.info api(php),so could anybody please tell me how to use this api in order to send data ...
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2answers
61 views

Beginner's Explanation [closed]

I'm interested in learning more about how bitcoin, mining, and blockchain technology work. I'm a student and don't have a strong background in computing, and I'm looking for a layman's explanation of ...
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0answers
26 views

Duplicate transactions - which one is correct?

I am using listsinceblock to get a list of transactions. When I do this, I get 2 transactions - a send and a receive - but they are both going to the same address. I have a regtest environment, and I ...
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2answers
88 views

Can I see a transaction sent to me if I haven't downloaded the whole blockchain?

Last received block was 12 weeks ago, and I'm still syncing. I have moved some bitcoins to this wallet from another, but I still can't see it in my inbox after a day. Is it because I don't have all ...
0
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1answer
35 views

What am I doing wrong with my BitcoinXT test net setup?

I installed bitcoind and bitcoin-cli, set the configuration file so that I am using test-net and requested funds from TP's TestNet Faucet. The funds never appeared in my account. I thought at first ...
4
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1answer
77 views

Why isn't Bitcoin using public key extraction from signature to reduce the blockchain size?

Why doesn't Bitcoin use public key recovering from the signature in order to reduce the Blockchain size? This would save 32 bytes per transaction input.
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0answers
59 views

Wallet didn't include fee, transaction stuck on unconfirmed

My wallet has always automatically included a transaction fee everytime I do a transaction, but this time it didn't and I dont know why. I did everything like I always do and I haven't changed ...
1
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1answer
108 views

Chainstate database for download

Is it possible to download a recent snapshot of the chainstate database? I'm running bitcoind (v. 0.11.8) on a machine with ~1mb/s download speed. After my client reached 300000 blocks, the ...
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1answer
56 views

Is there a way to sign a transaction with BTC or any Altcoin without a computer using only pen and paper?

Was wondering if this is possible to do. Lets say Satoshi Nakamoto ended up prison in a foreign country and he was only able to communicate with the outside world by writing letters using only a pen ...
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1answer
59 views

Why does Bitcoin keep transactions in a memory pool?

Why does Bitcoin keep (unconfirmed) transactions in a memory pool? What would happen if these were stored on disk instead?
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1answer
98 views

Unconfirmed/pending transaction in MultiBit no longer exists, but my coin is still gone!

Last night, I transferred some coin to my MultiBit local wallet, which worked fine. Then I tried sending some to another wallet, and the transaction showed up as "unconfirmed/pending" after taking my ...
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0answers
58 views

Ledger wallet transactions missing from blockchain

I purchased a Ledger wallet and have used it for four transactions: three in and one out. The first two transactions (one in and one out for the same amount) are appearing on my Ledger wallet ...
4
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1answer
67 views

Mining for nil-transaction blocks only - gaming the incentive scheme by rogue miners / consortium?

I understand that there is incentive to include transactions where the output is less than the input so that the block creator can pocket the difference. But I'm wondering if that is really worthwhile ...
2
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1answer
91 views

BTC Exchanges and Counterparty Risk

I'm doing research on the above topic, but so far haven't found any or at the most only limitedly valuable articles/data published in recent time (past 6 months). What I'm interested in is how users ...
2
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0answers
25 views

Include Bitcoin-Transaction within database-Transaction

I am writing a system that uses the Bitcoin Core JSON-RPC API. Use case: user wants to withdraw some BTC to his BTC address. My application handles this request by the following logic: Check if ...
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0answers
36 views

What is the biggest bitcoin transaction ever performed so far? [duplicate]

What is the biggest bitcoin transaction ever performed so far (by value at the time of transaction)? And what was its transaction fee?
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0answers
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Missed a letter on the bitcoin address when sending [duplicate]

I generated a Bitcoin address from a site and made payment to that address from my PM through an exchange site. The problem is the bitcoin wallet had "h" at the end of it, but I missed it when typing ...