0
votes
2answers
65 views

Can one wallet send/receive bitcoins from/to multiple sources simultaneously?

Let's say for example I put my public bitcoin address on a website for donations and multiple people for around the world deposit bitcoins simultaneously to that same wallet: Will all deposit ...
2
votes
2answers
86 views

Why can't we expire two year old transactions?

I understand any output in blockchain can be left un-redeemed forever. But If we expire all transactions that are more than two years old (specifically after some number of blocks), there are some ...
-1
votes
1answer
42 views

How do I set up bfgminer?

How may I know if I've set up my bfgminer correctly? I don't have any hardwares (cause I'm like pretty broke and it costs a lot) so how may I know if bfgminer is properly working? How do I know if I ...
0
votes
1answer
47 views

Are there any online services available to exchange prepaid cards into BTC?

I live in the USA. I would like to use prepaid cards to buy some BTC (less than $100USD) I've tried trucoin.com and the wait time is enormous, 4 days since sign up and still haven't received an ...
0
votes
1answer
49 views

Start a Private Bitcoin Network

Is there anyway to create my own Bitcoin Network? I'd love to put my first block into self-own Bitcoin Network and make it grow : ) Any ideas?
2
votes
0answers
35 views

If only six blocks are solved per hour, then how are more than six miners getting paid per hour? [duplicate]

According to this page on average six blocks in the Bit Coin network are solved per hour, yet there are thousands of Bit Coin miners and presumably more than six of them are making money every hour. ...
0
votes
0answers
54 views

Transaction with 12+ confirmations at blockchain.info, but still no coins have arrived

So i'm using Blockchain.info as a wallet, i received some bitcoins to my wallet and inmediately after that i re-sent them to an exchange. Incoming to my wallet: ...
0
votes
1answer
60 views

How does bitcoin prevent this network splitting attack?

How are malicious nodes prevented from, after getting the nonce of a new block found by someone else, broadcast it to the other nodes claiming it to be its? Also, how does the bitcoin system solve ...
0
votes
1answer
31 views

Extract genesis block raw TX data

RPC does not return the raw transaction for the genesis block. I need to get this data for other coins to be able to add them to ABE. ...
2
votes
3answers
70 views

Receving donation on a bitcoin address and security issues of reusing the same address

I am running a blog and would like to receive donation from my followers. So I should add a bitcoin address on my Support me page! But on bitcoin.it, it is recommended to never reuse addresses (not ...
0
votes
1answer
33 views

Redeeming OP_SHA256 hash OP_EQUAL (Testnet) Tx

I created the following non-standard Tx on the Testnet3 network: 6b52c981e6814072db77cb755b2633cd126b4ca21501d18ab994531e17a4a813 { hash: ...
0
votes
0answers
47 views

How to generate a private key to create wallet through api in Block chain

I need to pass private key while creating a wallet in blockchain.info through api call which is defined here https://blockchain.info/api/create_wallet I'm using php for creating wallets. Please ...
1
vote
1answer
54 views

Why did my transaction not include the fee?

I've been using Bitcoin for a long time now. I've used all kinds of different wallets and API's. But, last night I moved 0.30 BTC from an android wallet which is a fantastic wallet, I think the best ...
1
vote
1answer
34 views

Is there any open source implementation of Bitcoin wallet encryption in Java?

I intend to establish an efficient and secure scheme for protection of wallets. For this , I need source code that implements wallet ecryption as mentioned in ...
1
vote
1answer
42 views

Correlation between Ripple and Bitcoin

Is there a correlation between the value of Ripple (XRP) and Bitcoin (BTC)?
1
vote
1answer
53 views

Error initializing block database. Do you want to rebuild the block database now?

I'm trying to set up a test network consisting of 3 nodes, each with different bitcoin.conf. I've constructed the directory and the .conf-files similar to what is the state of the art in ...
2
votes
0answers
24 views

getblocktemplate times out after being called many times

I am writing a program about bitcoin mining. It calls the RPC method getblocktemplate every second. Sometimes bitcoind doesn't reply to my RPC getblocktemplate request, but bitcoind still accepted new ...
1
vote
1answer
51 views

Using Armory Watch-Only wallet in Electrum?

Is it possible to import a Watch-Only wallet that was made in Armory into Electrum? I like to use Armory for cold storage but like Electrum more for hot wallets because it's lightweight and you never ...
4
votes
0answers
26 views

Provable Solvency Implementations

Is there a list of provable solvency implementations? It appears to be that each company is taking their own unique swing at the problem. This strikes me as an area that could benefit from ...
1
vote
2answers
135 views

What is the estimated size of complete blockchain when all bitcoins are mined. i.e around 2140?

By size, I mean how many GBs or TBs of data storage I would need to save entire blockchain starting from Genesis block when all bitcoins are mined?
0
votes
1answer
17 views

Do I need to keep updating Armory version and more?

Do I need to keep updating version of Armory when it notifies me of new version. Just wondering if these are security patches or just some new bells and whistles in new armory versions. Seems like it ...
0
votes
1answer
17 views

Bitcoin accepted charities or organizations

I'm looking for Bitcoin accepted Charities. I want to make a list of the charities. I found that Donation-accepting organizations and projects but I prefer organizations which are saving children, ...
0
votes
1answer
59 views

How to store blockchain data

If I wanted to imprint the blockchain data on a database, with the purpose of performing complex or just different than the RPC-based queries, how would I do it? Would I have to go for a relational ...
3
votes
3answers
119 views

Are people incentivized with BTC to run nodes?

Bitnodes shows everyone running nodes. Are these people incentivized to run nodes? If not, why not? If so, do node operators make some BTC from transaction fees, etc.?
3
votes
1answer
45 views

Android BTC clients that remotely use my Bitcoin Core wallet?

Are there any Android BTC clients that remotely use my Bitcoin Core wallet so I don't have to use another wallet specific for my phone? I am running my own BTC node.
3
votes
1answer
57 views

blockchain.info and blockexplorer.com show different balance for the same address

Does blockexplorer.com have a bug or some other reason? https://blockexplorer.com/q/getreceivedbyaddress/1KWd23GZ4BmTMo9zcsUZXpWP4M8hmxZwRU 1.95331249 ...
0
votes
0answers
28 views

How much is known about mining pools' transaction fee policies?

We know that as of today in Bitcoin Core v0.10.0, the default value of minrelaytxfee is 1000 satoshis, and CreateNewBlock in miner.cpp uses this value as the minimum fee rate threshold in order for a ...
0
votes
1answer
38 views

Why can I only see the balance of my wallet and not the one of each of my receiving addresses? (Multibit)

I have some troubles to understand the logic behing addresses and wallets. I use Multibit to manage my BTC. I have one wallet with 5 receiving addresses. I have transfered from an exchange website ...
2
votes
1answer
105 views

What mining performance can we roughly expect from the Intel SHA extensions of the upcoming Skylake processor architecture?

Intel is scheduled to release their new x86 SkyLake microarchitecture in Q3 2015. Among other interesting features, it will introduce SHA extensions that will allow hardware acceleration of the Secure ...
1
vote
1answer
22 views

Testnet version history

From Bitcoin Wiki: Testnet There have been three generations of testnet. Testnet2 was just the first testnet reset with a different genesis block, because people were starting to trade testnet ...
2
votes
1answer
37 views

watch-only addresses doesn't work properly in bitcoind v0.10.0

I imported a watch-only address to bitcoind by using below command: bitcoin-cli importaddress <myaddress> "testacc" true According to release notes it should support some rpc calls for this ...
0
votes
1answer
38 views

BIP32 child derivation from another child

I have a bit of conceptual problem here, Let's say I have a BIP32 implementation. If I derive two subkeys (1/2/1/2) and (1/2). is it possible to derive (1/2/1/2) from (1/2) with a subkey of (1/2)? I ...
1
vote
0answers
30 views

How do I get hash to verify transaction?

If I have the public key and signature for a transaction how do I get the hash value that is used in verify(hash, sig, pubkey). I want to know how to work backwards from a raw transaction to get it, ...
0
votes
1answer
40 views

Coinbase denies transaction: Please complete verifications to send money

I use coinbase to transfer BTC for few monthes. Everything used to be ok up to today. I suddenly got message "Please complete verifications to send money". I did not ever get this message before. ...
0
votes
0answers
22 views

Signing data with a namecoin private key?

Consider the following scenario User A stores an image on a DHT and receives a SHA-256 hash in return. User A wants to prove ownership of the data has, so he registers a username on the namecoin ...
0
votes
0answers
7 views

Is there any exchange that accept paypal [duplicate]

is there any straight-forward or however indirect means to exchange paypal? because there are almost no means available online. all the means that were referred are outdated. can anyone kindly share ...
1
vote
2answers
69 views

bitcoin script for a competitive crowdfunding-like contract

I'm curious about how one might replicate the functionality of http://whatbitcointhinks.com/ using bitcoin script. The functionality is that there's a sort of crowdfunding competition between two ...
-1
votes
0answers
44 views

How I can verify a Transaction in my new alt coin?

I have created a new coin and all the coins are premined. But when I transfer some coin to other wallet, it shows as "Pending Balance" with 0/unconfirmed. I want to verify my transaction. How can I do ...
1
vote
1answer
50 views

What is meant by “relaxed standards” for P2SH redeem scripts in Bitcoin Core 0.10.0?

From the Bitcoin Core 0.10.0 release notes: Standard script rules relaxed for P2SH addresses The IsStandard() rules have been almost completely removed for P2SH redemption scripts, allowing ...
1
vote
0answers
29 views

Blockchain (lack of backwards) compatibility in Bitcoincore 0.10.x

From Bitcoincore release notes: Because release 0.10.0 makes use of headers-first synchronization and parallel block download (see further), the block files and databases are not ...
0
votes
2answers
31 views

Bitcoin exchange platforms and foreign exchange regulations

I'm wondering how cryptocurrency exchange platform adapt to country regulations where foreign exchange is forbidden (especially where sending money outside is forbidden). How they could buy Bitcoin ...
3
votes
1answer
55 views

Generating private keys in Java

I'm looking for a way to generate private keys in Java. I'd like to make this a standalone program, so I'd rather not use a library like bitcoinj. From my research I've only seen people recommend ...
1
vote
2answers
29 views

What is Namecoin's blocksize limit?

Bitcoin's is 1MB at the time of writing this. Seems like Namecoin would have to be bigger due to it proving 512 bytes of storage with a name update, but it also has slower average block times(about 20 ...
0
votes
2answers
43 views

Sending from address to address in bitcoind

I'm programming the back-end for an ecommerce solution, Bitcoind API gives me one way of sending money to a bitcoin address: sendfrom <fromaccount> <tobitcoinaddress> <amount> If I ...
0
votes
2answers
41 views

BItcoind/P2Pool What am I doing wrong?

I am running latest bitcoind and p2pool releases (default port settings) on Fedora 21 with ports open for 3332-3333, 8332-8333, and 9332-9333. Everything appears to be well when connecting to the BC ...
0
votes
0answers
34 views

Blockchain.info RPC API and deposit/withdraw problem

I'm using blockchain.info RPC to detect deposits using Node.JS as server, using listTransactions method. Because blockchain.info doesn't has walletnotify api. When processing deposits, there is no ...
0
votes
0answers
13 views

How or where to send a picture postcard via web/internet and pay with Bitcoin?

I’m searching for a service where I can send picture postcards via the web paying with Bitcoin. I have searched with google but did not find any service, where I can pay with Bitcoin (only credit ...
0
votes
1answer
42 views

In Peercoin style Proof of Stake, can one person 'stake' for another's address?

The parameters included in the staking are listed here: // ppcoin kernel protocol // coinstake must meet hash target according to the protocol: // kernel (input 0) must meet the formula // ...
2
votes
3answers
213 views

How do I make a profit buying cloud-hashing contracts?

I have tried one of the hashpower selling/buying website (nicehash) to buy hashpower. I have connected my order to a pool where I had one worker. However, despite all the advertisements, I could not ...
0
votes
0answers
51 views

What is “Signing transaction failed” error means ? How to resolve and avoid it?

I just tried to send some bitcoins and I received this error , I don't understand what does it mean and why?

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