All Questions

Filter by
Sorted by
Tagged with
2
votes
4answers
837 views

What are the most secure-yet-convenient ways of creating a wallet, that require just remembering a password?

A friend just asked me "where are the 11 BTC I bought from you half a year ago? ... I don't remember where I put them." He formatted his computer a few months ago, and the money is probably lost (all ...
10
votes
8answers
3k views

Are there any services hosting Bitcoin-related ads for websites?

Say one owns a Bitcoin-specific website and they want to get some ad revenue for Bitcoin-related ads. Are there any websites that host such ads and provide the necessary code for displaying and ...
7
votes
3answers
5k views

How to know if a transaction is valid?

I understand there are a couple things that need to be checked for a transaction to be valid - the previous transaction had to be correct, no OP can invalidate the transaction, etc, but is there a ...
7
votes
4answers
2k views

Why did Bitcoin transaction volume heavily increase in November and December of 2011?

Looking at this chart: http://blockchain.info/charts/estimated-transaction-volume It's clear that the amount of bitcoins moved between November 14th and December 12th of 2011 was much larger than any ...
6
votes
1answer
327 views

How can I know *exactly* when my name_new domain is ready for the name_firstupdate step?

The FAQ very vaguely says "Wait at least 12 blocks", but it doesn't make much sense to me. Unless I have totally misunderstood how this works, once the name_newd domain is in the chain, I should ...
2
votes
2answers
156 views

Will BTC value depend on their history?

It might seem that virgin coins will have higher value than older coins that have lot of exchange transactions that might make it more traceable. Is there some prevision in the protocol for this ...
14
votes
2answers
3k views

What happens when NameCoins stop being generated?

When Bitcoins stop being generated it won't be a problem: prices can gradually be lower. Namecoins, however, have a more-or-less set price, which is the domain register price. If Namecoins stop being ...
2
votes
3answers
333 views

What are the major reasons for various Bitcoin-related projects' downfall?

The Bitcoin community is a very dynamic place, especially when the USD/BTC exchange rates are high. Many Bitcoin-related projects have sprung up in the past, but a lot of them failed for various ...
3
votes
2answers
912 views

Guidelines for creating a PHP driven web app for redeeming Bitcoin coupons

I would like to issue Bitcoin coupons with a given USD value. The redeeming web app should accept the coupon pin-code and a Bitcoin address and transfer bitcoins to that address according to the ...
3
votes
2answers
1k views

What countries are already represented in the Bitcoin network?

What countries are already represented in the Bitcoin network? I am asking this to see a list of countries, so we will know how well it is spreading, and if there is some area that is not reached. ...
1
vote
3answers
377 views

Where can I go to read up on encryption methods used in Bitcoin?

Where can I go to read up on encryption methods used in Bitcoin? I am particularly interested in the idea that I can use a private key to sign something and it proves to the world I have the private ...
2
votes
1answer
348 views

Sent 95BTC to my client from Mt.Gox and it never showed

I have had Bitcoin for some time now, but am relatively inexperienced. I have a Mac client, and yesterday sent 95BTC to it from my Mt.Gox wallet but it never arrived. I sent Mt.Gox a message asking ...
5
votes
1answer
667 views

Are there any mining pools operating on the Testnet? [closed]

Are there any mining pools operating on the Bitcoin Testnet, or do pool owners just test their code using their own machines without keeping the test pool up for too long?
8
votes
3answers
2k views

Does sending from a green address improve my anonymity?

If I am interested in improving my anonymity when dealing with a merchant, does sending from a Green Address help? My proposed steps for buying from a merchant as anonymously as possible would be: ...
11
votes
4answers
704 views

Does the bitcoin block contain minimal transaction detail? (Is it as private as possible given the proof-of-work design?)

From https://crypto.stackexchange.com/questions/508/could-one-prevent-double-spending-in-decentralized-digital-currencies-like-bitc "Now, the only information about the transaction that needs to be ...
13
votes
4answers
27k views

Help! I sent coins to my bitcoin wallet before it was properly synced! [duplicate]

I sent coins to my Bitcoin wallet not after installing it, but before it had fully synced! Then I closed and reopened it after sending the coins. It had generated a bitcoin address to send to, but is ...
6
votes
3answers
1k views

bitcoind — how can i get the number of peers to exceed eight?

Presently I am running bitcoin-qt 0.5.1 on ubuntu 11.04, and am running with seventeen peers. But if I run bitcoind (still 0.5.1 on ubuntu 11.04) I can't get more than eight, no matter how long I ...
16
votes
2answers
12k views

ECDSA r, s encoding as a signature

An ECDSA algorithm when signing a given messages produces a pair of outputs, r and s. How, given a sigStr from a Tx can one extract r and s? Are they just concatenated byte arrays of a specific length,...
7
votes
3answers
412 views

Push deposit notification through HTTP requests

Is there any alternative to bitcoinnotify? That send a POST request to a URL on an deposit event to a chosen address. I know there is blockchain.info that send email. And instawallet that where you ...
3
votes
1answer
7k views

How do I fix GUI Miner stuck at connecting?

GUI Miner v2011-08-24 just shows "connecting..." when trying to connect to slush's pool. The console shows: 2011-12-31 14:00:49: Running command: poclbm.exe smithd98@gmail.com.macbookpro:4fuqPtrI@...
2
votes
1answer
570 views

How to get destination address from bitcoinj TransactionOutput?

I believe TransactionOutput represents one of the outputs of a transaction. I have a list of such output objects, and a String that represents my own address. I would like to check that this output ...
6
votes
3answers
15k views

How do I unlock, decrypt, Bitcoin wallet?

I'm new to Bitcoins and I downloaded the new beta version with the encrypted wallet. I encrypted my wallet but I have no idea on how to decrypt it. It is locked. How can I unlock/decrypt my wallet? ...
4
votes
2answers
229 views

In order to “pay someone back”, must I ask them for a return address?

I want to write code that accepts a transaction, and afterwards "pays back" some amount to the origin of the transaction. Assume users will be using the standard client. Will transactions have a ...
3
votes
0answers
639 views

Tick and price data [duplicate]

Possible Duplicate: Where can I find a graph of Bitcoin value vs USD for over 60 days? Where can I get raw data series of Bitcoin prices? Where can I get historical price data for bitcoin? I ...
4
votes
1answer
271 views

When backing up a wallet, is it required to shut down the bitcoin client?

I am building a website, and would like to backup my wallet.dat file after every transaction occurs, but I would not like to have to shut down bitcoind every time I make a backup. The common wisdom ...
6
votes
1answer
625 views

Can a competing cryptocurrency make Bitcoin obsolete?

If a new cryptocurrency is created, with some unknown property that Bitcoin does not have, can Bitcoin be adapted to include this property, or will Bitcoin become obsolete? (I believe I know the ...
6
votes
1answer
677 views

How do I generate offline transactions in Java?

I'd like to develop a Java binding to the Stratum Overlay Network (a server for thin clients). This requires signing on offline transactions. Can I directly use bitcoinj's API to do this? Can I copy-...
3
votes
3answers
1k views

Tracking transactions as a Receiver

I have a question concerning the transaction of bitcoins. If, for example, I send some BTC to a specific address, does the receiver have any chance in verifying that I have already sent the BTC, ...
4
votes
1answer
220 views

Lightweight client, bare necessities

What are the bare data necessities that a lightweight client would have to get from a server client in order to perform basic wallet tasks (show balance, transaction history, number of confirmations, ...
-3
votes
3answers
139 views

How can both individuals and the Bitcoin community as a whole promote and advocate the Wikimedia Foundation to deal purely in Bitcoins?

With the recent addition of a Bitcoin address to their donation page, the NYC chapter of the Wikimedia Foundation has at least partially accepted Bitcoin as a valued currency and reduce the burdens ...
6
votes
1answer
1k views

Is there a good tutorial on how to use bitcoinjs exit nodes?

The documentation that I found seems to contain info about specific API calls, but no top level explaination/example. Where can I find a practical concise example of using exit nodes? I'd like to ...
4
votes
1answer
162 views

How does the network determine whether to replace a transaction?

Further to this question, how does the network determine whether to accept a new version of a transaction as a replacement transaction? Could an attacker replace transactions maliciously?
16
votes
2answers
5k views

How was the magic network ID value chosen?

Messages on the Bitcoin network are identified by the magic value 0xD9B4BEF9, and on the testnet by 0xDAB5BFFA. Why were these values chosen?
5
votes
1answer
308 views

Are there live BitcoinJS Exit Nodes?

Where can I find some live (trusted?) BitcoinJS Exit Nodes? I'm looking it it from the client perspective - I want to write a Java app that doesn't store a blockchain. I don't want to setup an exit ...
4
votes
1answer
499 views

Is there a remote Bitcoin API that doesn't require anything to be stored locally?

What I imagine is a trusted centralized server (say run by Mt. Gox or some other exchange), that exposes a simple medium/low level API (let's say in JSON): getTransaction(fromAddress) getTxDetails() ...
4
votes
1answer
288 views

How can you find how many keys you wasted in bitcoinj?

Supposed you create a new wallet and pre-populate it with 100 keys (so you don't need to back it up after each transaction). How do you know, given an instance of Wallet, which keys have been "used ...
2
votes
3answers
818 views

What happens if a monopoly grows in Bitcoin mining and payment processing?

What happens if a monopoly grows in Bitcoin mining and payment processing? Here is a scenario that I have been thinking about. Some big corporation, like the Bank of Amerika, decides that Bitcoin is ...
4
votes
2answers
2k views

How to interpret Mt Gox Live orders chart

How does one read and interpret the data on the MtGoxLive/Orders chart? The axes have units. The new help link at the bottom does not have much information.
9
votes
2answers
3k views

What is the longest time gap between blocks in 2010 - 2011?

I notice on blockexplorer that block 159531 was mined at 2011-12-28 10:53:53 and the next block was mined at 2011-12-28 11:24:58 - a gap of more than half an hour. I know the 10-minutes-per-block rule ...
7
votes
1answer
1k views

Script - OP_IF etc. clarifications

Description of the OP IF is a bit vague on the wiki. Where does one get statements for the op for? Are they coming from the stack, or from somewhere else? Are there any available examples of how a ...
2
votes
3answers
992 views

What mobile wallet software is available for BlackBerry?

Is there a technical reason why there is no mobile wallet software for BlackBerry users? Is it just because the marketplace on BlackBerry is awkward? Or are there other technical problems? Are the ...
2
votes
1answer
197 views

Script - OP_SIZE

Does the OP_SIZE operation in Script push one item onto the stack (length of the string), or two (string and its length)?
1
vote
1answer
111 views

Script - true and false values

In the Script, when one is checking whether a value is true of false, should the length of the expression be checked? For example, 0x01 is evaluated as true, but can the same be said about 0x0001, ...
5
votes
1answer
695 views

Does bitcoin-qt support jsonrpc?

After some time away, and a dead Vista PC, I have come back to Bitcoin and installed the latest (0.5.1-beta) on Windows 7. (Don't worry, I didn't lose my wallet.) On my old machine, using bitcoin.exe,...
9
votes
4answers
5k views

Could the $25/£16 Raspberry Pi computer be used to run mining equipment?

Raspberry Pi $25/£16 PC article I saw this article today and it looks like a really interesting development in budget computing. It's a $25 barebones computer that runs Linux, and can play games ...
-1
votes
3answers
475 views

Need help, understanding bitcoin value protection

I'm not understanding how to protect my bitcoin value from inflation. IF I purchase bitcoins with US dollars, how to I educate myself to how to protect the value of my bitcoins in my wallet so that ...
15
votes
3answers
8k views

Copy wallet to Electrum or Multibit?

Is there a way to import my wallet from Bitcoin.org's client into the much lighter Multibit or Electrum? The disk space & bandwidth consumption (not exactly well presented to a beginner) quickly ...
95
votes
17answers
219k views

How can I buy Bitcoin via a Credit Card or Paypal?

I want to buy some bitcoins. Ideally, I would like to buy them on the MtGox exchange (because the consensus seems to be that this is the most reputable exchange), however I have found the system for ...
7
votes
1answer
1k views

When is the Bitcoin payout for solving a block going to change?

When is the Bitcoin payout for solving a block going to change? What happens when overnight it is half as profitable to process a block?
9
votes
1answer
7k views

PHP script to create private key & public address

Does anyone have an PHP code that can do what is done on this website: https://www.bitaddress.org Namely create private keys and associated public addresses?

15 30 50 per page