Linked Questions

43
votes
3answers
12k 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 ...
28
votes
2answers
23k views

Why are there two transaction outputs when sending to one address?

I did a small transaction some days ago: https://www.blockchain.com/btc/tx/4c07a07dfd9d5b79d168ec6835df876c64e82350a8f9211bf586d858a5aeb9ba Some info: 1JFWE8THcAQQRYx99c43DXSGyoPL9Zs62D is my ...
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?
11
votes
4answers
3k 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,...
7
votes
1answer
256 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 ...
6
votes
4answers
760 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 ...
6
votes
3answers
20k 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 ...
5
votes
1answer
15k 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 ...
4
votes
1answer
684 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. ...
2
votes
2answers
183 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 ...
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? ...
2
votes
1answer
226 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 ...
2
votes
1answer
553 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....
2
votes
1answer
819 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
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 -> ...

15 30 50 per page
1
2 3 4 5