All Questions

0
votes
0answers
5 views

Bitcoind confirmations during fork

I'm using bitcoind's JSONRPC interface to get transaction information for my wallet, specifically, I'm running a little script every time a block gets broadcast (using -blocknotify) which calls the ...
-1
votes
0answers
25 views

Critical bug in Coin controller [on hold]

I was investing in Coin controller but its and critical bug that makes my investing not SHOWING! It says that it have been send and I still got 2 min left but it never show!!! This happend both when I ...
0
votes
1answer
15 views

How to Enable Port Forwarding for Litecoin Mining?

I've just started Litecoin mining, and I've realized that my blockchain takes eons to download, even though its only less than 4GB. I've read several other posts on the same problem, but none of them ...
2
votes
2answers
27 views

Is there any way to make an UTXO that cannot be spent until a certain block #?

In bitcoin, each transaction has an nLockTime integer to specify the earliest allowed block number/time that the transaction can be added to the blockchain. In addition, each transaction input has an ...
0
votes
1answer
27 views

Why are non-final transactions considered non-standard?

In IsStandardTx within main.cpp, there is a comment: // Treat non-final transactions as non-standard to prevent a specific type // of double-spend attack, as well as DoS attacks. (if the transaction ...
1
vote
0answers
20 views

Bitcoin POS: payments between seller and buyer

My application has sellers with stored (public) Bitcoin addresses - lets say "receiving address". Also application allows anonymous buyers who can buy goods from these sellers paying by bitcoins. ...
1
vote
2answers
26 views

What sort of tasks can an ASIC be developed to do?

I know requiring a lot of memory is one thing that makes an algorithm ASIC resist. Are there any others? Could an ASIC be developed to do Elliptic Curve Crypto? Like adding two points, or signing a ...
0
votes
1answer
14 views

Why am I not getting payments on my bitcoind on an amazon ec2 instance?

I have an amazon ec2 instance running a web server, MySQL server, and bitcoin daemon on ubuntu 14.04, and I ran ./bitcoind getnewaddress and the output was an address. I sent a few cents worth of ...
1
vote
1answer
24 views

Why does the default miner implementation use pay-to-pubkey?

Looking at the v0.9.3 source in miner.cpp: CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey) { CPubKey pubkey; if (!reservekey.GetReservedKey(pubkey)) return NULL; ...
0
votes
1answer
34 views

Time to send bitcoins?

I was investing bitcoins in Coin Controller but I need the time to send it because they only give you 10 minutes. So I want to know how to calculate the time to send bitcoin with for an example ...
1
vote
1answer
25 views

JSON-RPC to detect double-spent TXs

How can I be positive that one of the incoming payments to my bitcoin-core was double-spent after it was confirmed once by the network, through the JSON-RPC interface? Related questions: How do I ...
1
vote
2answers
44 views

ECDSA x,y coordinate validity verification doesn't seem to work

The ECDSA algorithm, secp256k1 for Bitcoin allegedly uses the equation y ^ 2 = x ^ 3 + 7 mod P to determine the validity of an alleged point upon the elliptical curve. Utilizing ...
0
votes
0answers
17 views

We are running an e-commercial site. A client used an wrong address for transaction and he is asking us to finding those coins [duplicate]

We said its impossible to find those coins since he don't have the wallet; How can it be possible somebody got an wrong address with the right checksum and he does't possess the wallet.dat file.
0
votes
1answer
17 views

Where can I find per-second bitcoin price & volume data?

I am looking for per-second (or any time interval less than one day) bitcoin data for bitcoin price and volume on any given exchange. Do you know where I can find this sort of data? Have found ...
1
vote
1answer
51 views

What programming language do most Bitcoin exchanges use?

I'm pretty new to Bitcoin and want to learn more. I've only heard PHP is terrible (e.g. Mt. Gox) and a more efficient / more security-oriented language is preferable for matching orders and account ...
3
votes
0answers
28 views

Redeeming a raw transaction step by step example required

I am looking, specifically, for a step by step example transaction of sending Bitcoin which uses an actual transaction (How To Redeem A Basic Txn, from a few years back, does a great job of outlining ...
4
votes
0answers
28 views

Have there been any successful “airdrops”?

Starting with Auroracoin, a lot of coins aimed to perform an "airdrop" and distribute their coins to certain groups of people. I am wondering, have there been any successful airdrops? If so, how did ...
0
votes
1answer
23 views

OP_RETURN with bitcoind not working

I have created a raw transaction with the following hexstring which decodes to: { "lock_time":0, "size":248, "inputs":[ { "prev_out":{ "index":1, ...
2
votes
2answers
166 views

How can I reduce the time until I get the newest block ? Does the number of the outbound peers affect the speed?

I am running a full node on the Bitcoin network. Sometimes, I find that it takes a while until I get the newest block. I checked the source code, and found that every node can at most connect to eight ...
3
votes
1answer
182 views

Correct syntax for Bitcoin URI: bitcoin://1xxx-etc or bitcoin:1xxx-etc?

To make clickable Bitcoin links, to let people easily pay from their wallet, I see two formats being used in various situations: bitcoin:14bTZTm1uX2uVAqHr62oyGFEkwy2mNLbVb?amount=0.25 and ...
2
votes
4answers
34 views

Unable to open Backup binary file Linux

I recently reinstalled Linux mint; I backed up my wallet, and I am unable to import the backup created from the original wallet (Qt version 4.8.6.) to the newly installed wallet(Qt version 4.8.6.) I ...
2
votes
1answer
40 views

Why does the daemon require peers in order to start mining?

I wanted to start mining bitcoin from the genesis block, so I cloned bitcoin and removed the checkpoints. Then I compiled and started up the daemon. I wasn't connected to any other peers, however, so ...
3
votes
5answers
103 views

Why didn't Satoshi make the nonce space larger?

I know Satoshi isn't around to ask anymore, so this might be futile to ask, but I'm hoping someone might have some insight about this. Satoshi programmed in an extraNonce (bnExtraNonce) and a nonce ...
0
votes
0answers
17 views

Bitcoin protocol related questions [on hold]

How bitcoin wallet knows how much money I have? : it count it on the basis of the bit coin chains or i just uses some variable to keep the info? If I understand it correctly, every time when I make ...
1
vote
1answer
40 views

Multisig created from Multisig address

Can a multisig address creation process use other multisig addresses as signers to result in a new multisig address Would this also result in a greater number of signers to be necessary to approve a ...
1
vote
1answer
18 views

OP_Return in transactions at json_rpc_api at blockchain.info

I am writing a project in Ruby using JSON-RPC to communicate with blockchain.info. The API is available here: https://blockchain.info/api/json_rpc_api Is it possible to create a op_return txout using ...
0
votes
1answer
54 views

Is there a way to use My Wallet account with bitcoin-qt client?

I have some funds on My Wallet account (Blockchain.info) and I'd like to have a possibility to use them with my bitcoin-qt client. Is there a possibility to do that? Please give short description. I ...
1
vote
1answer
31 views

where is the code about sending command getblocks in bitcoin source code

I am reading the protocol part. One silly question. I found the part processing getblocks part, but i did not find when and where to send the getblocks command.Or it is deleted in the new bitcoin ...
2
votes
1answer
28 views

Negative Dogecoin Balances?

Through dogecoin-cli, I sent half the dogecoins I own to an external address. Now, when I call the listaccounts function, I get this: [root@web ~]# ./dogecoin-cli listaccounts { "" : ...
0
votes
1answer
35 views

Correlation between business cycle and BTC price

I would like to know if there is a correlation between business cycle and Bitcoin price, whether it is negative or positive. I am wondering because Bitcoin is deemed as commodity in my country's law, ...
1
vote
4answers
97 views

Would it be possible to add an RPC call to be able to determine if a node is fully synced?

After reading this answer, where Peter Wuille talks about how a node can't really tell if it is synced or not, it got me wondering if there is a way we can tell that a node is as synced as it possibly ...
2
votes
2answers
54 views

What methods are currently used to embed additional data into the Bitcoin blockchain?

Yes, I do understand that it is inappropriate to pollute the already large blockchain with data not necessary to make the currency work. But I know people are using Bitcoin as an underlying system for ...
0
votes
1answer
42 views

Is bitcoin an effective way to receive international payments?

I live in the UK with a GBP bank account, and recently I need to receive an amount of $115.92 from a contact in the US. We looked at a few options: International bank wire: instant no go as his US ...
-1
votes
0answers
21 views

Error Message Using BTCMerch [on hold]

The code I use on my webpage to sell products using bitcoin/litecoin is getting an error message. This is the code I’m using: <div align="center"> <input type="hidden" ...
0
votes
1answer
41 views

how to integrate bitcoin in my project for payment

I am working on a website where i need to implement bitcoin for transaction. I downloaded: https://github.com/Bit-Wasp/bitcoin-lib-php I don't know about it how to set . it always throwing error ...
4
votes
1answer
185 views

When to worry about 1-confirmation payments

A customer sends me a payment for some digital good at my service, where delayed delivery is a deal-breaker, so I only wait for 1 confirmation by the network before releasing the links for the ...
1
vote
1answer
61 views

Do you need to be connected to the internet to send someone bitcoin?

Say I walk into a store that accepts bitcoin. I decide to buy something and go to the counter. I get my smartphone out to pay the bitcoin. Does my smartphone need to have an internet connection to ...
0
votes
0answers
11 views

API feed for OHLC / VWAP data in (close to) real-time

I'm interested in the OHLC / VWAP data (both historical and recent) provided via API to be used by external charting application. I don't want to use trades methods as whole process should be as ...
2
votes
1answer
39 views

Security: Blockchain.info vs bitcoind

I want to set up a website that needs an online bitcoin wallet (able to deposit and withdraw at any time). Would it be better to use the blockchain.info's infrastructure through API commands or should ...
2
votes
1answer
16 views

Check how many blocks dogecoind downloaded

I just started to run dogecoind, and I am wondering how I am able to check how many blocks I have currently downloaded vs. how many total blocks need to be downloaded? I found this handy script for ...
0
votes
0answers
25 views

bitmixer.io usage

I am somewhat confused by the bitmixer.io site. I can enter the Adress, where I want to send bitcoins to, but I have no idea how to go from there. How can I send bitcoins into the service? Can anyone ...
1
vote
1answer
21 views

Do Miners get a reward for re-confirming blocks?

As far as I know, to ensure double-spending didn't happened and also for other security reasons, there is minimum number of confirmations that a transaction should have to be accepted. That value is ...
1
vote
1answer
64 views

how to get one address from two public keys?

Parsing an input script of a transaction, I’ve come across two public keys in the script. Either public key is 33 byte long. I know how to transform a single 33 byte long public into an address. ...
5
votes
2answers
88 views

How can Trezor update firmware but never receive malware?

I understood from What is it about a Trezor that means it can't be infected by malware? that a Trezor would only interpret data as transaction details, but the Trezor also updates firmware. How is it ...
1
vote
2answers
23 views

How do I trade at BTC-e?

I want to sell 1 LTC via BTC-e. How does selling LTC for USD takes place at BTC-e? Most probably I'll firstly deposit 1 LTC in the BTC-e wallet and then go to LTC/USD and then enter 1 LTC under the ...
2
votes
2answers
86 views

Is this a problem that a pool found 6 consecutive blocks?

Check this out: The pool will not make the 51% attack of course, for they are counting money on the system; but it's still a problem right?
0
votes
2answers
81 views

How can I recover my coins?

I'm using an alt coin. The wallet would not sync so I deleted the blkindex.dat file to restart the download. I restarted the wallet client and it downloaded all the blocks, but all my coins are gone. ...
2
votes
2answers
270 views

What is a thin client?

I've heard that if you don't want do download gigabytes of data just to use bitcoin you gotta use a thin client. But what is a thin client? What are the main advantages of a thin bitcoin client and ...
1
vote
1answer
56 views

I can't find my bitcoin address and my bitcoin core is out of sync by 3 years

Hey guys I am a newbie at Bitcoin just recently found out about it. I downloaded Bitcoin core; I encrypted the wallet; I created a backup folder, but it is out of sync by 3 years 4 weeks and i can't ...
1
vote
3answers
59 views

Bitcoin transaction with dust output stuck

I made this transaction more than 24 hours ago, and it still has no confirmations at all. What should I do? This transaction was created by the mobile Blockchain.info wallet. At the time, it didn't ...

15 30 50 per page