2
votes
2answers
20 views

Multi-currency wallet api

I need a api or an application that can generate and handle (send/receive and so on...) multi currency wallet. For an example: It can generate dogecoin address, bitcoin address, litecoin address, ...
0
votes
1answer
13 views

Has the nonce used in mining been sized?

In the mining process, everytime a block has to be confirmed, a certain hash with an incremental nonce is generated: now my question is: if the nonce is a 32 bit number it can assume a value between 0 ...
0
votes
0answers
6 views

Using custom parameters in blockchain.info's HTTP payment callback

I have a node.js app that uses blockchain-wallet npm module to generate a new receiving address every time a client wants to pay. blockchainWallet.newAddress({label:customstring},function(err, ...
0
votes
0answers
25 views

How to fork an Altcoin Which has 0 Reward Block to continue mining after the LAST POW BLOCK

Im trying to learn how is it possible to Hard Fork an Altcoin Blockchain to Continue the Mining Phase after the LAST POW BLOCK. The Block Reward is already 0 and the LAST POW stops at Block 8000. And ...
0
votes
2answers
22 views

Monitor bitcoin addresses for new transactions

This is usial checkout functionality. Show address to the user and needs to monitor it for new transaction during n minutes. Addresses not unique for each payment. Optional:it would be good to have ...
0
votes
1answer
22 views

Can two outputs from the same transaction be spent separately?

I am reading the transaction part. I don't know how to get the transaction hash. Does the whole transaction (include its vins and vouts) get hashed? If a transaction has two vouts (spent by different ...
0
votes
1answer
13 views

How can I find out if a transaction used a specific vout as its input?

I want to know if a certain output is spent. I am not using Bitcoin, I do not have a gettxout RPC call available. How can I learn if a vout is referenced as an input somewhere in the blockchain or ...
0
votes
2answers
45 views

I have free energy; good idea to mine BTC/LTC?

I don't need to pay for power to my computer. Is it a good idea to mine LTC or BTC on Intel Core Duo processor? My CPU is 2 x 2.6GHz (computer woks 24/7)
0
votes
1answer
16 views

Redeem bitcoins of non-standard transactions made with eligius

As I understand it, Eligius is the only miner pool accepting non-standard transactions. The Opcodes for the scripts are here. Some use cases for non-standard transactions can be found here. My ...
0
votes
1answer
34 views

How to turn bitcoins into cash money?

hi i'm asking about how to turn bitcoins into a cash (USD or EURO) that you hold in your hands so i can use it in real life not on the internet I don't have a credit card, and I'm in a country (IRAQ) ...
-1
votes
4answers
50 views

How does Bitcoin have an intrinsic value?

I have read several articles about how Bitcoin have an intrinsic value. Aside from the fact that some of those articles confuse "intrinsic value" with "benefits of adoption", I found that none of them ...
0
votes
0answers
15 views

Is there an IDE(Integrated Development Environment) for bitcoin0.9.3 like QT

Im doing tests on how rpc-cmds exactly works,I need to test the "importwallet" function which shows up in 0.9.3. QT only helps me to 0.8.6 .
1
vote
1answer
71 views

How to block a Ripple account from a Gateway's perspective?

I heard a few months back that Ripple enabled users to set their account to block other accounts from holding their IOUs. A feature probably aimed at Gateways to be able to freeze balances of blocked ...
0
votes
0answers
17 views

Armory “send” button is not reacting

I am trying to send BTC with Armory. Everything works just fine until I have to hit the "send"-button. Then it just does nothing. I have had this problem before (I had even posted it here) and ...
2
votes
1answer
44 views

What exactly are the rev00000.dat files?

I've been looking at the on disk structured generated by the standard bitcoin-qt client. It looks to me that the rev?????.dat files are reverse application for blocks? So I imagine every single spent ...
0
votes
1answer
10 views

using coinbase with uc_bitcoin drupal module

I need a simple hack to change the Drupal uc_bitcoin modules code so it gets the exchange rate from Coinbase, it is designed to use MtGox. I want to avoid using the entire coinbase API because I just ...
-1
votes
1answer
40 views

Get a list of txs that can be used for a newer tx

I'd like to write a simple Bitcoin client that broadcast transactions. The model is pretty simple: Alice wants to send 10 BTC to Bob. We only know Alice's private key and Bob's address. For ...
1
vote
0answers
26 views

BitcoinJ seems to be calculating balance incorrectly

My application is using bitcoinj-0.11.3. I am using Wallet.getBalance(balanceType) to read wallet balance. For AVAILABLE I get 8.94106037 This is supposed to include all confirmed transactions. For ...
0
votes
1answer
44 views

How to detect a race attack and re-spend the already-spent outputs?

My service automatically accepts, processes and sends payments to its users. It connects to bitcoind through its JSON-RPC API and makes use of the raw transactions interface. What is going to happen ...
-1
votes
0answers
28 views

Amazon coins to buy or not to buy? [on hold]

I see US coins on Amazon such as the American Eagle for far less then the asking price at the US Mint, is it worth buying from Amazon, I'm a skeptic? Also the 2014 American Eagle on Amazon has no mint ...
0
votes
0answers
23 views

Bitcoin Wallet Management APIs

I'm working on a proof-of-concept website. I'm planning for each new user to be assigned a new address for depositing funds, and to have a main escrow wallet also. The flow will be User's own ...
2
votes
2answers
90 views

Double Spending - Does each node maintain a list of unspent transaction references?

My Understanding Of How Bitcoin Prevents Double Spending Each transaction contains references to the input transactions and ever node has to verify all transactions from time immemorial to ensure ...
0
votes
0answers
31 views

How to generate transaction offline that spends from multiple addresses

How to generate pushtx transaction from multiple private key (or)to multiple address. Example: I have some address with balance address1 => 1btc address2 => 1btc address3 => 1btc address4 ...
0
votes
1answer
14 views

miner_proxy and minerd Settings

I've started a mining account of Wemineltc.com, and have decided to go down the track of CPU mining. I looked up the relative tutorials on how to do so, and I got some different results. I set the ...
1
vote
0answers
34 views

Querying insight-api to dump all addresses with a positive balance

It's been some time I've been using 'insight-api' (https://github.com/bitpay/insight-api) and I couldn't find any documentation / anything helpful to query leveldb in a way that all addresses with a ...
0
votes
2answers
56 views

How to recover from a double spending attack?

I found myself incapable of answering what would happen in this case, so here it is: A hacker (Mr Hacker) spends UTXO_1 and UTXO_2 in TX_1, depositing the monetary value of all TX_1's outputs into a ...
1
vote
1answer
26 views

Can the coinbase transaction be used to spend an UTXO?

I know the coinbase transaction's input is usually just has a dummy scriptSig, but what if a miner used it to spend an UTXO? Would it be verified as an actual spend, or would the block be rejected?
0
votes
1answer
51 views

How to power the Bitmain Antminer C1?

Bitmain has a new miner out that is pretty cool (water cool to be exact) called the Antminer C1. I have an S1 so I am familiar with the basic operation of the Antminers. However, I'm a bit baffled ...
1
vote
1answer
26 views

Does each peer prioritize inv(type=block) over inv(type=tx)?

I found that when a peer receives an inv message with type=block, it will immediately request that block or that block's headers with a getdata message or getheaders message. But if the peer receives ...
1
vote
1answer
12 views

BTC-E API (Retrieve error)

Is it normal to infrequently see errors retrieving trade/depth history by API from BTC-E? Or should I never see them. I seem to be seeing at least one such error each day, I am running my script on ...
0
votes
2answers
47 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
35 views

Critical bug in Coin controller [closed]

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 ...
1
vote
1answer
38 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
56 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
36 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
1answer
48 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
47 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
23 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
27 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; ...
1
vote
1answer
50 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
39 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
54 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
18 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
24 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 ...
0
votes
3answers
112 views

What programming language should be used to develop Bitcoin exchange software? Why?

I've only heard PHP is terrible (e.g. in the context of Mt. Gox) and a more efficient/more security-oriented language would be preferable for matching orders and account security. Which programming ...
5
votes
1answer
135 views
+150

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
2answers
61 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
24 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
170 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 ...
4
votes
1answer
197 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 ...

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