Linked Questions

0
votes
1answer
1k views

What is this extra address on blockchain.info? [duplicate]

I sent bitcoins for the first time to my friend. He has an address 1JkqP4qMvVpQApqyH4m9J4LBdqfFacMKSf I chose to send them through my wallet on Bitcoin-QT, but I was interested to check blockchain....
7
votes
1answer
249 views

Why do transactions need to be spend fully? [duplicate]

If I want to send you 75 and I have 100, a transaction of 100 will be made, in which I get 25 back as change. Why is this? See also Change When the output of a transaction is used as the input of ...
2
votes
1answer
220 views

spending some of the coins nullifies address' balance. where does the remainder goes? [duplicate]

I use litecoin-qt, but my guess it'll be the same for Bitcoin or any other crypto coin. I created a new wallet, added an address and received the coins I expected. Then I created another wallet on ...
0
votes
1answer
418 views

blockcypher amount transacted larger than amount transferred [duplicate]

When transferring some bitcoin from coinbase to my hardware wallet, I see on coinbase and on my hardware wallet that the amounts sent and received are about the same (minus a transaction fee), as ...
1
vote
1answer
357 views

strange weird address in transaction after send bitcoin bitcoin-qt [duplicate]

as an example, I have the wallet with address-A (with 10 BTC) If I send 1 BTC to someone (address-B) then in transaction I see address-A > 1 BTC > address-B address-A > 1 BTC > address-C ...
2
votes
2answers
82 views

Bitcoin core wallet - got 0 balance after transaction [duplicate]

I did a test lightning transaction by sending 0.00001 btc to some exchange with using bitcoin core 0.16 (downloaded from bitcoin.org and installed to dedicated pc) and... it took the rest balance of ...
0
votes
1answer
243 views

Why are my bitcoin transactions going to 2 addresses [duplicate]

Here is my transaction: https://blockchain.info/tx/3ddd5a173a73fc82bb0e1eb4361b8c36eb65919e2bfb9ee78fe2c6b5ff3f2307 I only sent .003 BTC to 1 address (35iR3hnFqmkHswRm8PmZgTKxYm7GfucNZJ), but the ...
0
votes
1answer
221 views

btc transaction show all btc moved from wallet [duplicate]

I transfered a small amount of btc from my private wallet with bitcoin core client. When I check blockchain.info I see the transaction with the amount of btc i transferred going to the correct address....
0
votes
1answer
163 views

Erroneous blockchain transactions…more coins than I specified! [duplicate]

This isn't directly related to Bitcoin; rather this is related to Infinitecoin, however the technologies are virtually the same. The other day I sent 2,000 IFC from my wallet (Infinitecoin-QT for ...
0
votes
1answer
116 views

bitcoin listunspent showing an address which does not belong to my wallet [duplicate]

I use bitcoin listunspent to list unspent UTXO, but found one that doesn't match my addresses, so what's that address and where is it from ? bitcoin-cli listunspent [ { "txid": "...
0
votes
1answer
104 views

My balance gets sent back to me [duplicate]

I'm using the blockchain API to make a "send to many transaction". In the recipients I only put other people addresses, but somehow the API sends the remainder of my balance back to me. For example: ...
0
votes
1answer
95 views

Why so many transaction send bitcoins to the sender? [duplicate]

While browsing the blockchain I noticed that there are a lot of transactions that send bitcoins to the sender (most part of the transaction) and a tiny fraction to another address. E.g. this ...
0
votes
1answer
99 views

Unconfirmed transaction, fees paid, seem to be two payments [duplicate]

Transaction id: 601536cadb0055cee97b4ff7969c707bea18745168fe6fedae95f854b2168b11 I made this transaction several hours ago. It seems like it is stuck at being unconfirmed even though I paid a ...
0
votes
1answer
48 views

Double transaction on same hash (transaction ID) - Loosing 0.01 btc each time [duplicate]

Each time I send some btc to another bitcoin wallet there is a second transaction on the same transaction ID (hash) and each times i am loosing around 75 USD. You can see by yourself here; https://...
0
votes
0answers
58 views

Where is the rest of my bitcoin? [duplicate]

I sent bitcoin from one of my wallets to another wallet using one address (output) then this is what I got only a fraction of my bitcoin the bigger amount went to another unknown address to me https:...
0
votes
0answers
45 views

Why UTXO is indivisible [duplicate]

I am new to understanding Bitcoin, but just read this: If an UTXO is larger than the desired value of a transaction, it must still be consumed in its entirety and change must be generated in the ...
1
vote
0answers
44 views

Why the address changes after each transaction? [duplicate]

Could you please help me understand these observations related to Bitcoin transaction? I have setup a brand new wallet from scratch and I sent 0.0246 BTC to it (well, slightly more but after the fees ...
0
votes
0answers
41 views

What is this transaction, I did not make [duplicate]

Can someone explain what has happened here? I mined a block of 50 a while back, then I recently made a payment of .31 BTC. Why is the other 49.69 also in the transaction? This extra transaction ...
0
votes
1answer
30 views

Why is it so that if some bitcoin is spent by any user, the rest of his account's amount should also be spent and paid him back? [duplicate]

I guess this is called Circular spending. Why is it required in the bitcoin protocol?
1
vote
1answer
31 views

My bitcoin change [duplicate]

I am new to this.I have sent out bitcoin over the blockchain before and saw that the hash just took a fee. However the other day it took out over.95 of a bitcoin when wanting to only send 0.04 of a ...
0
votes
0answers
28 views

Upon sending remaining wallet contents emptied? [duplicate]

Three addresses involved in this TX. Address A: My Wallet Address Address B: Recipients Wallet (Coinbase) Address Address C: Unknown! These are not the exact numbers but the transaction went like ...
0
votes
0answers
27 views

why a specific transaction value and it's output address which is sent from a specific IP address, returns from another address to that IP address? [duplicate]

I wrote a code to extract bitcoin output addresses and their values from TX messages of the bitcoin protocol. to test it, I prepare this scenario: first I send a specific bitcoin value(for example A ...
0
votes
1answer
24 views

Why is the value of the input way higher than the output resulting in a second change output? [duplicate]

Background: I'm experimenting on the LTC testnet client. My client has a balance of 0.4 LTC and I sent 0.1 LTC to another wallet address. https://chain.so/tx/LTCTEST/...
1
vote
0answers
21 views

Does Bitcoin transaction has information on remaining bitcoins with the sender? [duplicate]

I am new to Bitcoin and have gone through a couple of video introductions and articles. I have few questions on Bitcoin transactions: 1) I read that the sender needs to encode the numbers of ...
1
vote
0answers
13 views

Transfer amount on blockchain larger than was sent from wallet [duplicate]

I sent some BTC from a hardware wallet last year. The wallet shows a sent amount of 0.09302 BTC but when I look at the transaction id on blockchain.com it shows two amounts. 0.282 BTC unspent and 0....
42
votes
3answers
11k views

Why does Bitcoin send the “change” to a different address?

For example I have an address (A) with 20 BTC and send 9 BTC to address (B). Bitcoin will create a "change" portion of the transaction where the remaining 11 BTC goes to address (C). Why not send ...
23
votes
2answers
5k views

How should you backup your wallet?

How often? Is backing it up once enough? Any best practices to storing the backup?
9
votes
4answers
2k views

Why do outputs need to be spent entirely?

I understand what change is and how it works (and it's analogous to physical money change), but what I don't understand is why this is needed in the first place. Given that this is all computer based,...
5
votes
1answer
12k views

What does change address mean inside Electrum wallet?

I am bit confused with the change label that is inside Electrum Wallet . Can I receive bitcoin if i give this address which are under change label? What is the difference between Receiving and Change ...
6
votes
3answers
19k views

Using dumpprivkey to make a paper backup

I'm just getting started with bitcoin and haven't acquired any significant amount yet, but want to feel relatively secure before I do. And at the moment, my fear of losing bitcoins or a device on ...
6
votes
4answers
755 views

Bitcoin client which doesn't use wallet.dat?

Is it possible to use Bitcoin client without wallet.dat file, by entering your addresses and being able to see the balance, but without the ability to spend bitcoins? I know that it's possible to ...
2
votes
2answers
5k views

Does a new private key is generated at each transaction?

So, imagine I bought 1 BTC, so I have my private key generated by my online wallet and also my public key that I can give to people/friends. My question is, if I spend 0.5 to buy Apples on a website? ...
1
vote
1answer
1k views

Help! Tried sending bitcoins to myself and they disappeared

I'm using the bitcoin-qt client on v0.8.1-beta on Mac OSX I have 3 addresses. I tried sending .01BTC from one address to another. 1K3BjT1y2X2v3PGhqHh33dRb6kVGdR5CBA -> ...
4
votes
1answer
668 views

What happened to my coins, hacked?

I'm new to bitcoin, downloaded the bitcoin.org client, encrypted my wallet, and purchase a few bitcoins (5.25), for learning purposes. But now my coins seem to have disappeared to an unknown address. ...
1
vote
1answer
3k views

Sending from Coinbase to Blockchain wallet. Numbers explained?

I recently sent .9 BTC from my Coinbase account to a Blockchain.info wallet, but the numbers I see are confusing. According to my Blockchain app, the transaction was for .90130821 BTC, with a fee of ....
0
votes
1answer
1k views

Explorer showing different balance then my Blockchain wallet

My Blockchain wallet address on the explorer, shows a low balance (under .001) but when I log into the wallet I can see what should be there about .25 BTC. My Electrum wallet is also doing the same. ...
0
votes
1answer
557 views

Why do transactions send coins to the same address as they spent it from?

I often notice transactions such as: 364efe5a906de5971e242f9711008e58a5ab79f136a8044b66615e8662d35f09 Where funds from the address 3PU with 1.38 BTC are split to itself (1.35 BTC) and 37Ek (0....
1
vote
1answer
700 views

How does the transaction signature prevent transaction duplication?

Let's say that Alice sends 1 BTC to Bob. We have then a signature of (Alice sends 1 BTC to Bob) with Alice private key. What prevents Bob from duplicating this exact same transaction and sending it to ...
1
vote
1answer
509 views

Why does coinbase make 2 transfers instead of one

I'm new to bitcoin in general and coinbase.com in particular. Can somebody explain what happens when I order a payment (in bitcoins) from their web interface? Say that my acount owns 1 BTC. I create ...
1
vote
1answer
769 views

Just received a payment twice from coinbase

Edit: Looks like the error was with my wallet. When I contacted support, they said to have the wallet rescan the block chain. After doing that, my balance went back to 0. I'm new to bitcoin, but ...
1
vote
1answer
642 views

How to return change (utxo - inputs) to output address?

I've been learning to create bitcoin transactions for 3 weeks now, but keep paying the entire unspent_outputs - inputs as fees, even if the transacted amount was like 1/100 th of the outputs. How do I ...
2
votes
1answer
490 views

First bitcoin payment, sent X BTC, but transaction amount on blockchain.info shows as more than 2X?

I sent 0.01047 BTC through coinpayments.net using electrum. First I selected minimum fee option, then I went back and selected one level higher as the fee tier. My electrum wallet and blockexplorer....
-3
votes
2answers
472 views

Will I get my bitcoins have I been scammed?

Okay, I'm wondering what's going on here. I recently synced my wallet after ordering some bitcoins, but I never received them. The guy who sent them to me, sent me the blockchain address. So, I don't ...
0
votes
1answer
217 views

Am I being hacked, can I prevent it?

I have just sent bitcoins from one account of mine to another, and after I sent it I checked on blockchain.info to get updated about confirmation. There, I noticed something peculiar, it said that I ...
1
vote
1answer
317 views

what is the meaning of Segwit receiving address and segwit change address ..?

What is the meaning of different type used in bitgo api like bellow : Url : https://bitgo.github.io/bitgo-docs/?javascript#add-wallet m/0/0/0/0 (which is also the ID used to refer to a wallet in ...
0
votes
2answers
61 views

Can two or more transactions sent from the same address be mined in the same block in Bitcoin's blockchain?

Imagine a person Bob has 10 bitcoins in his wallet. He wants to send 5 bitcoins to Alice and another 5 bitcoins to Uncle Tom simultaneously (in separate transactions). Will both Bob's transactions be ...
1
vote
1answer
90 views

Why did the remaining money go to another address?

I'll try to be short. I gifted 1 BTC to a friend several months ago. She is a completely non-technical person. She tried to send a small fraction of that 1 BTC to her brother, and either she seriously ...
1
vote
1answer
69 views

How to read a transaction from a block? Who paid whom?

I'd like to know how to read a 'transaction', so if we take an example of this transaction (which comes from block #520156) it's easy to spot that 'th' paid 'U8' 0.005BTC and '9E' paid 'Y5' 0.013BTC. ...
1
vote
1answer
99 views

How would this double spend attack be prevented?

I know, that a user cannot create a fork in the chain. Also, it is said, that since every transaction is publicly announced, any attempt of double-spend on the same chain would be rejected as the ...
0
votes
1answer
88 views

Bitcoin Address Workflow on Spend Leftovers

I need to understand the correct Bitcoin address workflow for transactions. I created an address a while back with a common wallet and sent some coin there. The address is at segwit m/49'/0'/0'/0/0. I ...

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