0
votes
1answer
17 views

Getting bitcoin globe data

I just saw this bitcoin globe https://blockchain.info/nodes-globe?series=topBlockRelay It has two modes,"Online Now" and "Miners". I wanted to ask if anyone knows what the bars and colors stand for ...
0
votes
0answers
10 views

Cryptocurrency with small block size limit or large block time

So there are a lot of cryptocurrencies that tries to improve on Bitcoin's 1 Mb block size limit and 10 minute block time (6MB per hour) by using faster block times or larger block size limits. For ...
1
vote
2answers
8 views

Where can I access a NXT public testnet node?

Was wondering where can I access a public NXT testnet node?
1
vote
1answer
18 views

Avalon mining issue

Pretty much a newbie to mining and got an Avalon (Nano 3) to start, I'm running Windows 8.1 and using the LPC USB VCom port (COM3). AvalonGUI runs about 5 minutes at 3-4 GH/s - then closes/stops ...
0
votes
0answers
9 views

JSON decode of 1 failed

Trying to mine using cudaminer but I keep getting JSON error 1, here is the batch file cudaminer.exe -H 1 -i 1 -l T9x20 -C 2 or -H 1 -i 1 -l T12x32 -c 1 -o stratum+tcp://global.wemineltc.com:3333 -u ...
1
vote
1answer
50 views

How does the bitcoin network recover in case of a hash collision in the block hash?

A Bitcoin client has to download the whole blockchain from the P2P network in order to become a full node. A full node is able to determine, if a transaction in the network is valid or not. To ...
0
votes
2answers
26 views

Ubuntu. (blockchain of version 0.9.3 compatible with 0.10.1?)

I have version 0.9.3 of bitcoind on my Ubuntu server and I want to upgrade to 0.10.1, I have nothing in my wallet. Does the blockchain 0.9.3 compatible with 0.10.1? Do I have anything to keep from ...
1
vote
1answer
20 views

Compact integer in Scripts

I've been looking at the compact representation of integers for integer operations in the Script language. It seems that most operations produce or push byte arrays, but when integer operations are ...
2
votes
3answers
55 views

Transaction without fee

If i want to make a transaction and sent it without fee how long it will be getting conf ? And my friend told me it will take more than 1 day. Can anyone here explain to me why it can be happen ?
0
votes
1answer
21 views

Total amount of nodes and avarage active peer number

I have 2 questions: Does anyone know where to find a reliable source for finding out a total amount of active bitcoin nodes? How many peers does each active node have in avarage? Is there a limit to ...
1
vote
1answer
9 views

Compiling litecoind on Ubuntu 15.04

I am trying to compile litecoind on Ubuntu 15.04 and I stuck here: /litecoin/src$ make -f makefile.unix USE_UPNP=- make: makefile.unix: No such file or directory make: *** No rule to make target ...
0
votes
1answer
9 views

no IPv6 peers connecting to my node

getnetworkinfo says IPv6 is working on my node: { "name" : "ipv6", "limited" : false, "reachable" : true, "proxy" : "127.0.0.1:9050" } Yet why don't I get any IPv6 peers connecting to my node? ...
0
votes
0answers
6 views

Blockchain API whitelist all IP addresses

I am currently trying to implement the blockchain API in my application. I have done this successfully however, I am having trouble whitelisting IPs. Each time a user accesses the app with a different ...
1
vote
1answer
12 views

Can I ignore the blocks directory for time machine backups on OSX?

After installing Bitcoin-QT I have over 40GB of files in the ~/Library/Application Support/Bitcoin. It seems that the most important file there is wallet.dat. Does it mean that I can exclude from time ...
1
vote
1answer
24 views

Import two wallet.dat into Bitcoin-Qt client

This is very closely related to Import wallet.dat into a new Bitcoin-Qt client, but I feel this is not a duplicate because the (great) answer to that Q is for only restoring one wallet. I used ...
0
votes
0answers
14 views

country official currently if convert in bitcoin [on hold]

i living georgia and georgia official currency is GEL and now GEL price very drop down against the dollar . before happened gel price degradation then cost. 1 dollar 1.10 GEL right now aproximately ...
0
votes
1answer
40 views

Why the message is need in verify function

here is the how bitcoin works under the hood article http://www.imponderablethings.com/2013/07/how-bitcoin-works-under-hood.html i did not got this why message is needed when using this verify ...
2
votes
1answer
19 views

RFC6979; (v, r, s), what is v?

Deterministically signing a Tx with RFC6979 returns v, r, s, where r and s are the 2 values used in standard ECDSA signatures. v = 27 + (y % 2), so 27 + the parity of r, as pybitcointools indicates. ...
0
votes
1answer
22 views

Block Chain Library

I was wondering if there are any open source blockchain libs that I could use to build a project with? Thanks
0
votes
0answers
5 views

Bitcoinj Multisignature Address

In multisignature address contract, how to set multisigoutput while sending bitcoin back to the client? I tried this, byte[] bytes = ...
0
votes
0answers
6 views

Secure my wallet with a YubiKey?

Is there a way to secure my Bitcoin Core wallet using a YubiKey? (cf. this, which mentions "using a YubiKey as one of the parties for m-of-n signatures." cf. this thread: "Yubikey and Bitcoin ...
2
votes
2answers
22 views

Is this brainwallet approach safe enough?

Let's suppose I derive a private-public keypair from a passphrase like this : long_and_complex_enough_but_yet_easy_to_remember_passphrase Now I wish to generate 100 more keypairs using same ...
0
votes
1answer
22 views

Transaction still unconfirmed

I sent some money 3 hours ago my BTC client (Bitcoin Core) still says the payment is unconfirmed ?. Any help much appriciated
1
vote
1answer
22 views

What is the function of LOCK(cs_main)?

Does LOCK(cs_main) pause and branach the program in order to do some necessary job before going on? I'm trying to publish blocks reactively (as a selfish miner) upon receipt of inventory message from ...
-2
votes
0answers
45 views

Its been hours and still unconfirmed! [on hold]

http://puu.sh/iIjyz/e992fbe540.png What the hell is wrong? I sent almost 600 euros of bitcoins to blockchain and still can't use any of them! Example one of my transactions has 18 confirmations, BUT ...
3
votes
1answer
35 views

All else being equal which is better for the environment, Litecoin or Bitcoin?

Does scrypt mining inherently confer any environmental benefit or energy efficiency for the same level of service provided?
0
votes
0answers
8 views

where can I download the blockchain nightlies handled by tcatm?

I want to download the blockchain nightlies handled by tcatm, yet the site seems down. Is there any alternative site? Thank you
6
votes
2answers
60 views

Can someone outline the full pros/cons of the various Replace-By-Fee proposals?

I've done some research myself, but I find that I'm either biased myself, or my sources themselves are biased. Does anyone have an objective analysis of the various proposals and their ...
1
vote
1answer
16 views

Versions of BTC and TEST

I'm dorking around with creating a TEST transaction using libbitcoin's bx command. Besides setting the inputs and outputs, the bx tx-encode sub-command allows one to specify lock_time and version. ...
0
votes
0answers
21 views

Bitcoin core 64 bit has freezed

I downloaded bitcoin core 64 bit and it was synchronizing. I turn my laptop off and open the program again and now it frozen at " loading block index " . I have bitcoins on it. What should I do now ?
1
vote
0answers
17 views

Meta-Mining: Can mining exist in abstract states?

Has anyone here explored or pondered possibilities for meta-mining? Theoretically, you could have miners work on any computational problem, and then have rewards handed out proportionally as part of ...
3
votes
0answers
56 views
+50

How to migrate wallet from namecoin to namecore?

Today I updated namecoin by building the new "namecore" reimplementation but when starting namecoind I got this message: Error opening block database. Do you want to rebuild the block database now? ...
0
votes
0answers
15 views

Node doesn't “printtoconsole” as prescribed?

I've written a script that shall start 6 nodes with -printtoconsole simultaneously on regtest but somehow after executing ./script.sh, each time, all nodes start ("Bitcoin server starting") except ...
1
vote
0answers
20 views

Bitcoind writes complete wallet.dat regularly which is a problem, what can i do?

i have troubles with my system, using iotop i identified bitcoind as the source of problems. I am running bitcoind of bitcoin-0.10.0-linux32 and am using the RPC calls of bitcoind. My wallet file is ...
-2
votes
1answer
26 views

How much GH in 1 TH [duplicate]

Greetings , Please say : 1 TH = 1000GH ? Thank you in advance !
0
votes
1answer
30 views

my bitcoin core software isn't opening.

I downloaded bitcoin core (64 bit) and I am still waiting for it to synchronized. But just now, If I open the software it loads from 1% to 100% and then a note appears with the inscription " cannot ...
0
votes
1answer
14 views

How to cancel the callback url registered on blockchain.info

So i was testing the Blockchain receive API, and during the first trial, I had a typo on the callback url. Does that mean blockchain.info will retry to call that bad url 1000 times before it finally ...
1
vote
1answer
17 views

Duplicate r value for an address: only an issue for a multi-input Tx?

I've modified the r-scan Python code to look beyond the 50 Txs the Blockchain.info API usually returns. My modifications take all the r values for my address and look for duplicates, but a commented ...
0
votes
1answer
31 views

bitcoin core 0.10.1 upgrade stuck syncing

I just upgraded from Bitcoin Core 0.9 to 0.10.1 on Ubuntu 14.4 after being gone for a few months (blockchain data is from February). When I loaded up bitcoin-qt, it seemed to be working fine and ...
1
vote
1answer
23 views

P2Pool Hardfork 14.0 where and when is it decided?

I have read on here that hardforks are a point where the pool with the biggest stick gets to decide which course the blockchain will take. Has the hardfork only just begun? When is the fork ultimately ...
2
votes
0answers
19 views

Do exchanges charge fees from base currency or from counter currency?

I'm building some trading robots for a while already but I keep seing that something is wrong with my end of day balances. My robot does arbitrage across multiple exchanges and I always take into ...
3
votes
1answer
19 views

Can the fee produced by estimatefee be artificially manipulated?

Could a miner who wanted more transaction fees manipulate the fee produced by estimatefee? If so, what percentage of hashpower would it take, and how long would you need it?
0
votes
1answer
22 views

How to determine public keys that were used to generate a multisig address?

How can I verify the public key that I provided was actually used to generate the multisig address I'm funding for say escrow?
0
votes
1answer
54 views

Have bitcoin developers applied the solution for selfish miner attack?

The Majority is not enough paper proposed an academic and somehow practical attack to Bitcoin mining system based on creating hidden forks. The paper claims that if miners work on whichever fork they ...
0
votes
0answers
8 views

Good API for making shareware that accepts bitcoin?

Are there any good APIs for accepting Bitcoin within Qt or similar such applications, for making paid shareware applications?
2
votes
1answer
26 views

Minimum Tranasction Fees

At current exchange rates, it looks like the standard transaction fee is on the order of tens of cents (USD). Inclusion of the standard transaction fee means getting the transaction picked up within ...
0
votes
1answer
20 views

Path notation for extended public key of hardened child?

Typical path notation for a BIP44 child private key would be something like: m/44'/0'/0' The public key is point(m/44'/0'/0') Where point is the ECC multiply function. Is there any better ...
0
votes
0answers
5 views

pindexLastCommonBlock - No update after reorganization?

How often do peers update their last common block with other peers? If a node receives a new best blockchain tip, it seems as if this peer doesn't make this new tip to the last common block with the ...
1
vote
1answer
15 views

Bitcoinj How to create multi-signature address using bitcoinj

Can somebody help me with step-by-step list of how to create a multi signature 2-of-3 transaction using bitcoinj api?
3
votes
1answer
33 views

which transactions does bitcoind validate?

which types of transactions does bitcoind v0.10 perform checksig validation on? blockchain transactions belonging to a wallet with known private key blockchain transactions belonging to ...

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