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0
votes
0answers
27 views

How does the core client decide which UTXOs to spend?

If a core client has several UTXOs to spend when it is prompted to make a transaction, what logic does it follow to choose which UTXOs it spends? Is it oldest/newest first? Maybe prioritized by ...
3
votes
2answers
71 views

How to sweep a bulk wallet?

If I have a bulk wallet with, say 100000 key pairs (address/private key) and I have received payments on any, say 1000 of them, how can I sweep all the coins to a new address? It would be even better ...
2
votes
1answer
80 views

Specifics on “Race Double Spending Attacks”?

Hi guys I am doing some research on double spending in the bitcoin network several ideas have been confusing me: In prevention of Race attacks, merchants are advised to "connect to a large random ...
-1
votes
1answer
96 views

What's up with all the QR codes? [duplicate]

Just bought $5 of Bitcoins from CoinBase. How do I spend them? I gather it has something to do with QR codes. . . .
0
votes
2answers
170 views

Spend BTCs from a paper wallet

So, I want to create a cold storage bitcoin address to store incoming BTCs from donations and payments (I'm a freelance developer so I'm getting used being payed with BTC). Since this address has to ...
0
votes
0answers
37 views

How to check transaction outputs for redeeming from bitcoin-qt console

Is there a way to check, that tx output is spent already? For example blockexplorer.com and blockchain.info show such information. Unspent output example Spent output example
1
vote
2answers
207 views

Spending bitcoins - what happens to the change left in your address?

How do I manage my wallet and addresses when spending bitcoins? For example, let's say I have address abcdefgh, and I have 10 Euros there. I read that when I buy something worth say 4 euros in ...
6
votes
2answers
180 views

Freelancer: billing my customers in bitcoin

I do freelance work and I was considering offering my customers the option of paying me in Bitcoin. Given that bills are usually paid in 2 - 4 weeks after sending them, and the exchange is still quite ...
2
votes
1answer
31 views

Will Flattr support Bitcoin?

It would be great if it would be possible to spend Bitcoins via Flattr. Does anybody know if there is something planed?
4
votes
2answers
755 views

Can you pay with Litecoin anywhere you can pay with Bitcoin?

Can you pay with Litecoin at any place that accepts Bitcoin? If no where can you spend Litecoins?
4
votes
2answers
1k views

Where can the private key from a bitaddress.org paper wallet be redeemed?

I recently got started by creating a single wallet using bitaddress.org. This contains the public bitcoin address and the private key in the wallet import format. I now have some coins in there, but ...
2
votes
3answers
2k views

How do I withdraw bitcoins from my MtGox account?

I've purchased a few bitcoins on MtGox. Now I'd like to spend them. How can I actually spend the coins I purchased on MtGox? I've looked around mtgox.com for any indication of private keys, bitcoins ...
3
votes
2answers
200 views

Effect of price increase on usage of Bitcoin

I was just about to pay for something with Bitcoins today and I hesitated for an instant thinking that the price might be $10 more next week. Is it possible that Bitcoin holders will be less likely ...
4
votes
6answers
1k views

Is anyone actually spending bitcoins?

I see lots of people talking about buying bitcoins, mining bitcoins, but no one spending. Maybe I am getting it wrong, but unless I can get paid with bitcoins, this seems to be pointless in my ...
5
votes
3answers
666 views

How are fractions of bitcoin implemented and spent?

If the ability to spend bitcoins and therefore bitcoins depend on/correspond to private keys, how can fractions of coins exist? Can the key be split up? How are fractional transactions signed versus ...
6
votes
2answers
381 views

How can I control which coins to spend in a transaction?

When creating a bitcoin transaction, you have to choose which coins to use in them. The standard client does this in a way to avoid unconfirmed inputs and minimize the number of inputs and amount of ...
3
votes
1answer
81 views

Are there any mining pools that allow a specified amount of bitcoins to be sent to a chosen address?

This would be like using a pool as a wallet service, as you could send a subset of your balance to a retailer to purchase something and avoid running the Bitcoin client app. Most pools only pay out ...
24
votes
2answers
1k views

What is the coin selection algorithm?

When creating a transaction in the standard client, what is the algorithm used to determine which unspent outputs will be used as inputs? Has this changed since the first version? What different ...