0
votes
0answers
6 views

Difference between bitcoin-tx, bitcoin-cli, and bitcoind?

I just pulled from the bitcoin github and compiled, and noticed that there were three executable generated: bitcoin-cli bitcoin-tx bitcoind I have not heard of bitcoin-tx before, what is it? ...
0
votes
0answers
2 views

Does OP_HASH160 consume the top stack element?

In a standard P2PKH configuration, the scripts look like: Pubkey script: OP_DUP OP_HASH160 <PubKeyHash> OP_EQUALVERIFY OP_CHECKSIG Signature script: <sig> <pubkey> When ...
1
vote
0answers
13 views

Bitcoin Core and Armory working together?

I am confused, totally new to Bitcoin and not really a digital expert, so forgive me if the following is stupid. I downloaded Armory two weeks ago and it asked me to also install Bitcoin QT which I ...
0
votes
0answers
16 views

How to determine a break even point and how many coins one can mine?

If I had a Block Erupter 49 Port USB Hub and started filling it with AntMiner U2 USB miners, how do I figure out how many coins I can mine versus the expense of the hardware? (lets forget about ...
0
votes
0answers
12 views

Is it possible for corporate interests to incentivize securing alternate Blockchains instead of Bitcoin's Blockchain?

Is it possible for corporate interests to incentivize securing POW of alternate Blockchains instead of Bitcoin's Blockchain? Given the large amount of funding and/or "partnerships" announced the last ...
1
vote
1answer
14 views

How to denote <serialized> script in P2SH transaction?

From the bitcoin developer page, the format of the scripts used in P2SH transactions are as follows: Pubkey script: OP_HASH160 <Hash160(redeemScript)> OP_EQUAL Redeem script: <OP_2> ...
2
votes
1answer
23 views

Is anyone using the blockchain (or other core Bitcome technology) for device registration?

I've been reading about several alternate uses for the underlying technology behind Bitcoin: Proof of Existence (digital notary) Namecoin (for DNS as well as identity and messaging) I was ...
-7
votes
0answers
18 views

please help me I am DEVELOPER [on hold]

hey can you please take a look at my code i am the newest developer for dime coin and i am having problems with my jsonrpc.php it keeps having a error can you run the code https://t.co/CGuFTFJVNH ...
0
votes
2answers
30 views

How do I list the addesses in my keypool?

I want to list all of the addresses in my wallet, even the ones that aren't being used right now. I know that I can change the number of addresses with -keypool, but I want to list all of the ...
1
vote
0answers
17 views

Is it possible to specify a default change address?

Is it possible to enable default change address on my bitcoin-qt (aka bitcoin-core) client? I'm using a webservice that monitors my balance (based on public keys) and whenever I send a transaction my ...
0
votes
0answers
4 views

How do I change the default blockchain Database download location for NXT?

I'm testing out the nxt client and was wondering how do i change the default database download location? Its currently downloading to the current folder (nxt_db).
0
votes
1answer
34 views

Could a modified miner send a transaction and broadcast it immediately upon discovery of a block to claim a new block and the 25 BTC block reward? [on hold]

Could a person hack their miner to simply submit small transaction as soon as a block is found and to submit that as a new block with the 1 transaction to reap the 25 BTC block reward? Say, sending ...
0
votes
0answers
15 views

Which part of code (function) handles received transactions?

I was trying to understand the flow of control between functions ( operations performed and their order) when a transaction is received.
0
votes
2answers
43 views

Who give initial value to Bitcoin? [on hold]

I know how the process of changing BTC price ​​occur, but I curious as to what gave the initial value to BTC and whether the price of another cryptocurrency refers to the BTC? How would I replicate ...
0
votes
1answer
31 views

Bitcoin recovery? Need help

Im looking for some advice on trying to recover bitcoins. So, the story is, i transferred some bitcoin to my multibit wallet, it came through but still didnt confirm after 20 hours. So i tried ...
1
vote
2answers
23 views

How does a Trezor passphrase prevent restoration of a wallet if an attacker knows the seed?

Trezor User Manual says if you forget the passphrase there will be no way to recover your bitcoins. Not even the Recovery seed. How is it that you (or an attacker who knows the seed) can't just ...
1
vote
2answers
30 views

What is the current status of Multi-Sign function in bitcoin network?

Are they convenient enough for some real world transactions? Like an easy escrow that the two party can assign to a third party to finish a transaction?
0
votes
1answer
47 views

Do Bitcoins mined in a pool automatically transfer to your wallet?

I've installed the GUIMiner app and the Multibit app. I am in a mining pool, and I have about 17 shares thus far. Do the Bitcoins transfer to my MultBit wallet automatically or do I need to do it ...
0
votes
0answers
16 views

okcoin - separate USD/CNY exchanges? [on hold]

So I'm trading USD on okcoin.com. I was looking at https://bitcoinwisdom.com/ There I see the 7 day volume for BTC/CNY is 2,106,799 The 7 day volume for BTC/USD is 438,759 There's five times more ...
0
votes
0answers
9 views

How The Ideal Reserve “branch reconciliation” “in less than 400 ms”?

Here says After having launched bootstrap Clearinghouses on all major continents, they are fully reconciling transfers in less than 400 ms with competition and 200 ms without. "Reconciliation" ...
0
votes
1answer
19 views

Deterministic keys with one-way operation

BIP 0032 "Security Implications" states One weakness that may not be immediately obvious, is that knowledge of a parent extended public key plus any non-hardened private key descending from it ...
2
votes
2answers
28 views

Can a Trezor seed be used in any other HD wallet?

Trezor FAQ says If you do not use a passphrase, your recovery seed is all that is needed to access your bitcoins. If you do not use a passphrase, can the Trezor seed be used to recreate a ...
-1
votes
0answers
16 views

Insert data to transaction with OP_RETURN

This might be a possible duplicate with this. I want to know a proper way to insert additional string with OP_RETURN and retrieve the transaction from block chain and decode it accordingly. Thank ...
0
votes
0answers
9 views

Two out of Four transaction with excluding some key pairs

Is is in theory possible to set up a 2 out of 4 multi-sig transaction but only to allow only a subset of all possible combinations? More concrete: I want to have the keys A,B,C,D Valid combinations ...
2
votes
2answers
70 views

What is it about a Trezor that means it can't be infected by malware?

The Trezor testimonials include that TREZOR ... cannot be infected by malware What is it about a Trezor that means it cannot be infected?
2
votes
0answers
42 views

Where is the bitcoin wedding transaction?

There has been some buzz in the news about a wedding that put a statement in the blockchain declaring their message. Here is one source that reported on the news. Can anyone provide a link to the ...
1
vote
1answer
23 views

How does serializing in coins.h work?

I'm talking specifically about this: /** pruned version of CTransaction: only retains metadata and unspent transaction outputs * * Serialized format: * - VARINT(nVersion) * - VARINT(nCode) * - ...
1
vote
0answers
21 views

How do satoshidice's draws work? (HMAC hashes)

I am trying to understand how does a satoshidice draw work. As far as i have understood satoshidice generates daily two public hashes: HMAC hash (H from here on) Position hash (P grom here on) ...
4
votes
2answers
97 views

What is the average size of a bitcoin transaction?

I'm curious, since the inception of bitcoin, what is the average size (in bytes) of a bitcoin transaction? To be clear, the easiest way to find this is not to take the size of the block-chain and ...
2
votes
1answer
70 views

How to add additional information to transaction?

I want to add some additional information to my specific transaction, so that I can send the additional information to blockchain.
0
votes
1answer
37 views

How to get started with a Bitcoin wallet [closed]

Where should I go to start a wallet? I have downloaded the TOR browser and got online at WEUSECOINS.COM. Is there another site, perhaps one with more information for beginners, that I should be ...
0
votes
2answers
63 views

Does the value of my Bitcoin fluctuate automatically?

If you own a small amount of Bitcoin (say,$10) does one have to "invest" it somewhere for it's value to change or will the $10 fluctuate by just sitting in one's wallet and one can see the value ...
1
vote
2answers
78 views

What / Who is the Bitcoin mining-power useful to?

I searched the internet to find out who (or what) was taking advantage of the result of mining but i couldn't find a clear and complete answer (and sources). I know Bitcoin miners decrypt hashes, ...
0
votes
0answers
24 views

How fast is the NXT blockchain growing in 2014?

Is there a place that where I can find out how fast the NXT blockchian is growing? I'm curious because its this year (2014) where a bunch of nxt features came into the scene and was wondering how one ...
0
votes
1answer
20 views

Determine which transaction spent a Transaction Output

I will explain my question through an example on the bitcoin testnet network. I am looking at the output at index 0 of this transaction: ...
0
votes
1answer
15 views

Where does one obtain the most widely accepted Bitcoin/Euro exchange rate?

I want use Bitcoin to make a purchase from a private seller in another country. The good which I want to purchase is priced in Euros, so I need a Bitcoin/Euro conversion rate which both of us must ...
3
votes
3answers
204 views

bitcoin mssql decimal/money storage size

What's the decimal storage requirement in ms sql for bitcoin? GAAP standard quotes decimal (13, 4) for money. Is decimal (13,8) preferred for bitcoin or something else?
0
votes
1answer
20 views

Blockchain.info, How to receive new transactions (not websocket)

I'm trying to build safe transaction-confirmation app and need to synchronize new not-processed transactions. For example I monitor address A and have processed last transaction B, how can I ask ...
-1
votes
0answers
39 views

What is BitCoin? [duplicate]

I was reading some stuff about security and from where I heard the term Bitcoin. Googling gave me the definition that it is an online based payment system. Can anybody give me a very brief description ...
0
votes
0answers
19 views

Blockchain.info Wallet API: How can I send bitcoin without transaction fee

I am using Blockchain.info Wallet API for sending bitcoin. According to the API document, transaction fee must be greater than default fee. I tried to put the fee was 0 but the setting was ignored. ...
0
votes
0answers
25 views

How safe is sending out transactions using unconfirmed inputs for a service?

I've been running into problems with a high-traffic hot wallet, where a single transaction would lock up any input for a block with the spendzeroconfchange disabled. Would it be safe for a service ...
7
votes
1answer
512 views

Why is Bitcoin defined as having 8 decimal places?

At the protocol level bitcoins don't actually exists, but rather base units (recently called “satoshis”). Bitcoins are defined as 108 base units, meaning that for a 50 BTC mining reward, you are ...
0
votes
1answer
20 views

Remove address from sequence in HD wallet

Is there a way to eject an address out of the sequence of an HD wallet? Lets say an address was used for a political donation to a regime in Namibia that may get international condemnation a few ...
1
vote
0answers
12 views

Bitcoin Historical Price API/Database

I have found many APIs and databases that exist for historical Bitcoin prices but they will only give you data for daily intervals or tick data. Is there an API / database that exists that will ...
0
votes
2answers
35 views

Can you buy bitcoins as a Canadian without a bank account?

So is it 100% true that one cannot but bitcoins with just a credit card BUT your purchase MUST be connected to a bank account? If it's supposed go be anonymous then why is the bank account needed? I ...
0
votes
1answer
47 views

Is there a simple way for me to borrow bitcoins? [on hold]

I'd like to try making money in prediction markets that use bitcoin, like http://fairlay.com and http://predictious.com. The problem is that even if I make a profit, I can still end up losing because ...
0
votes
1answer
22 views

PHP Checking privatekeys

I am setting up my site on a hosting (not a server, just a hosting) where i will accept payments of bitcoins and maybe other cryptos later, after a week or so, i want to "sweep" my wallets. In short: ...
2
votes
1answer
86 views

Why does Bitcoin charge per transaction?

The first time I heard about Bitcoin, someone told me that it's almost free to transfer bitcoins to other people. However, I found something called "cost per transaction." Why does the Bitcoin network ...
3
votes
3answers
66 views

Random numbers using blockchain

How are the block hashes generated? Are they trully 100% random (generated by hardware) or is it pseudo-random (generated by software)? Can i rely on it or any other blockchain data to make a 100% ...
2
votes
1answer
23 views

How do I query a remote bitcoin node like RPC?

I know how to query the blockchain stored on my machine programmatically using bitcoind commands. Is it possible to do the same on a public node? For example, is it possible to send “getblockcount” ...

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