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2
votes
2answers
534 views

How is it possible to say that a bitcoin was fully spent?

Is a simple question, but I want to understand this at the low level. Since the UTXO is a database with the yet-to-be-spent coins, how can I say that a given coin was already full spent? What would ...
4
votes
1answer
72 views

Will people not spending their Bitcoin cause Bitcoin to fail? [duplicate]

Everyone I know that owns Bitcoin (including myself) seems to plan to sit on it until it becomes widely accepted/used and the price sky rockets to a ridiculously high value (100000 dollars each). It's ...
0
votes
1answer
130 views

Spending unconfirmed output from a change address

Consider a custom program which will occasionally need to send out bitcoin to users to whom I owe money. Let's say I have 100 unspent BTC at address ADDR_A. UserX demands payment of 1 BTC to ADDR_X. ...
1
vote
1answer
54 views

Would a service for automated repurchasing of Bitcoins encourage spending?

We launched Reload, an online service that binds your bitcoin wallet to your bitcoin exchange account (16 supported so far): whenever you spend bitcoins from your wallet, Reload will use your exchange ...
3
votes
1answer
318 views

What are the trade-offs between the different algorithms for deciding which UTXOs to spend?

When someone would like to make a transaction, their software has to choose which of their UTXOs to spend. Here are a few different ways that one might prioritize which UTXOs get spent. Oldest UTXOs ...
2
votes
2answers
244 views

How is the previous transaction hash calculated?

Can anyone provide a clear example on how to calculate a previous transaction hash? Say I want to create a new transaction, I get that the hash is calculated by doubling sha256 a message m, but I'm ...
3
votes
2answers
385 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
163 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
213 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
281 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 ...
1
vote
2answers
274 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
216 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
34 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
915 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
210 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 ...
5
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
882 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 ...