0
votes
0answers
8 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
11 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
21 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
15 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
6 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 all the means that were referred are outdated.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 ...
0
votes
2answers
33 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
15 views

Blocks were behind [on hold]

I had not ran bitcoin for a long time, started it up yesterday and it was going thru the process being behind, took about 8 hours to catch up but I still do not show any transactions. The last time I ...
0
votes
0answers
24 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
25 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
13 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
13 views

Bitcoin exchange plateforms 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
22 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
1answer
11 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
31 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
25 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
10 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
12 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
22 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 // ...
1
vote
3answers
84 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
40 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?
2
votes
1answer
32 views

Clarification of Tx Fees settings in Bitcoincore 0.10

I'm looking for clarification of the new Tx priority and Tx Fees settings (eg fee per kB in the 0.10 version of Bitcoincore. Is the 0.0001 BTC fee deprecated? Why the move towards variable Tx fees?
-1
votes
0answers
27 views

First time bitcoins, deep web [on hold]

I want to buy bitcoins to use for various transactions, but I never bought bitcoins before, I dont even have a wallet (yet) I know there is Bitcoin ATM machines where I live,. Is the safest way to buy ...
2
votes
1answer
73 views

Why doesn't the same miner always win?

If the miner with the strongest ability to solve the block wins, why doesn't the same miner win every time? Wouldn't that miner still have the strongest ability to perform the proof of work on the ...
1
vote
1answer
20 views

Alternative to run Bitcoin over Tor

I know running Bitcoin over Tor isn't a good idea: Bitcoin over Tor isn’t a good idea. My question is: there are any alternative to hide the IP to the network safely? Using a proxy, if you don't full ...
5
votes
1answer
59 views

Ubuntu bitcoin PPA

Since bitcoin is a software package that involves "real" money (inasmuch as any currency is "real"), I know there are major incentives for unscrupulous people to build backdoors into software related ...
0
votes
1answer
22 views

How to extract the signature of a transaction using bitcoinj

I am trying to extract the signatures from a transaction. What is the best way to do this given a com.google.bitcoin.core.Transaction object I just received from the network?
0
votes
1answer
22 views

After power hit, wallet won't load

I downloaded Bitcoin core wallet a few days ago. It was all going well, it synced just to about 25 weeks ago or something. One day the power went down and it shutdown the computer. When I started ...
0
votes
0answers
21 views

P2Pool error: p2pool.util.jsonrpc.NarrowError: -12345 p2pool is downloading shares

I have compiled p2pool multiple times (without noticeable errors) in Fedora 18 and started processing. Everything looks good until a miner (Antminer S5) tries to connect (using wallet address and ...
1
vote
1answer
39 views

If I held fiat currency, instead BTC, on MT Gox, would I get paid sooner/more?

If I held currency on Mt. Gox, but not actually bitcoins, am I in a different situation to those who held bitcoins? For example, if I had $700 AUD but 0 BTC. I can't get any information regarding this ...
1
vote
2answers
40 views

How can someone verify the signature of a Bitcoin ECDSA signature without knowing the signer's public key?

I understand how ECDSA exactly works and for verification of a signature, the public key of the signer is required. But in Bitcoin, public key is double hashed and the only information the receiver ...
0
votes
0answers
47 views

How much money should I invest in mining, so I can turn a profit? [closed]

First of all, how much hash/s should I create so I will win some money? (the only costs I have is the electricity am I right?) If I buy an asic machine after how many days/months I will have make ...
1
vote
1answer
31 views

Is it possible for a person's transaction to show up on the network BEFORE mine if I send bitcoins before him?

To clarify, if person A sends bitcoins to person B, and person C sends bitcoins to person D, 1 second (or less), AFTER person A, can person C's transaction show up on the network BEFORE person A's? If ...
0
votes
1answer
36 views

Best p2pool software

I'm pretty new to Bitcoin. This will be my second question at this site and I'll try to make it less verbose than the first while still containing what seems to be important detail. I'm still in the ...
1
vote
1answer
29 views

Best Way to Get Latest Transactions

I'm trying to write a node that listens all the bitcoin transactions in real time. I'm considering two ways of doing this: The first one is to check mempools of other nodes periodically and the second ...
0
votes
0answers
23 views

mining alt coins. trading/exchanges

I am interested in starting to mine alt coins. I have little in funds to invest in hardware, besides a laptop that I got from bestbuy. are there any coins that would be able to be mined from such a ...
1
vote
3answers
68 views

If bitcoin fails as a currency, how will blockchain tech still be secure for other applications?

We often hear proponents, like Andreas Antonopoulos, say things along the lines of Bitcoin being an application of the Blockchain technology and that Bitcoin as a currency can fail, but blockchain ...
1
vote
1answer
25 views

What exactly is XBTC?

What is xbtc? I saw many articles refered xbtc,just like "btc to xbtc". But there's no material telling what it exactly is.
3
votes
1answer
46 views

If there is a block-size hard fork, will the old chain have an advantage?

On his blog, Mircea Popescu claims the old chain will have an advantage: The situation here is aggravated by the fact that the fork proposed is not simply nondeterministic behaviour, and so the ...
0
votes
0answers
14 views

What do people mean by solving bitcoin transactions? [duplicate]

I have been looking at a lot of posts about how bitcoins are generated. They keep talking about how miners do computations of other "transactions". Do they mean bitcoin transactions or other forms of ...
0
votes
1answer
45 views

As of Feb 2015, what's the most technically secure wallet for Android?

I want a wallet on my Android phone that is rooted. I'm new to bitcoins and I'd like to know which one is technically secure...if it helps, I'll be buying Canadian bitcoins.
0
votes
1answer
28 views

How can transactions be verified without the private key?

Trying to get my head around her royal Bitcoin here... I understand that blocks of transactions are broadcast to the network, and that miners verify that the BC is 'spendable' by trawling the ...
1
vote
1answer
22 views

Difference between RPC calls addmultisigaddress and importaddress

I am trying to import a 2-of-3 multisignature address into my bitcoind wallet, watch-only. I have the public keys, but not the private keys. Two potential bitcoind JSON-RPC calls that seem to fit are: ...
0
votes
0answers
37 views

USB Altcoin Miners [closed]

So, I'm getting more and more involved with mining and investing in coins. I just got my bitcoin core up and running and my next question is this. To get started with mining at home I thought I'd ...
0
votes
1answer
31 views

Bitcoind becomes non-responsive over JSON-RPC, have to manually restart all the time

I run bitcoind on AWS on Ubuntu. The machine has 4Gb of memory and free shows some of it remains free. Enough disk space too. Yet, I have to manually restart bitcoind quite often, because sending ...
0
votes
1answer
47 views

How to configure bitcoind in Arch Linux

Ok, well I've been watching the Bitcoin trend with some interest for several years. And I've finally decided to get involved myself. So yesterday and today I've been reading for several hours from the ...
1
vote
1answer
25 views

Creating a raw transaction using Bitcoin Core v0.10.0 bitcoin-tx / createrawtransaction

I'm trying to create a raw transaction using Bitcoin Core v0.10.0 (on Windows 7 x64, and with txindex=1 optioned). Bitcoin Core v0.10.0 comes with a new Bitcoin-tx executable utility. The help menu ...
2
votes
1answer
129 views

Is libsecp256k1 faster than OpenSSL?

Bitcoin Core is eventually going to replace OpenSSL with libsecp256k1 for all ECDSA operations. As I understand it, this is motivated by wanting consensus-critical rules to not depend on OpenSSL. Is ...
1
vote
2answers
15 views

When was getheaders added?

Bitcoin 0.10 uses getheaders to synchronize. How long has this message been supported by other clients? How many existing nodes support it?
0
votes
2answers
42 views

Are there Bitcoin addresses with an odd number of transactions?

When I explore the blockchain on blockchain.info, all Bitcoin addresses seem to have an even number of transactions, e.g. 16Zugc8aq9sPkxBYXyYGqJHTizRzT5wTQg has 16 transactions. I have looked at a lot ...
0
votes
1answer
26 views

OP_RETURN in rawtransaction rejected with error code -25

I'm newbie with bitcoin, i'm trying to generate a rawtransaction but bitcoin-cli sendrawtransaction return me an error code -25. The transaction is { "locktime": 0, "version": 1, "vin": [ ...

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