0
votes
0answers
33 views

Bitcoin Core not working

I have downloaded bitcoin core, as it was recommended by the bitcoin site. It seems as though it simply doesn't work. I've waited more than 48 hours for it to download the block and it just isn't ...
0
votes
0answers
25 views

Leakage of information about selfish mining - what message is responsible?

A few weeks back I had asked a question about how honest nodes could detect a Selfish Mine Attack and if there were mechanisms that would disclose selfish mining. In a very first step: I've slightly ...
0
votes
0answers
19 views

Transaction broadcasted to the Bitcoin network but not in my mempool

I use armoryd (0.93.1) to send transactions in the testnet Bitcoin network with the three calls: 1. createustxtoaddress 2. signasciitransaction 3. sendasciitransaction The calls are all successfull, ...
1
vote
3answers
39 views

Where can I get a list of places I can use my Bitcoins?

I am new to Bitcoin and I'm trying to understand how it works and how I can make it work for me. So, let's say I travel often to different Spanish speaking countries in South America and Spain. How ...
1
vote
0answers
18 views

How to allocate hash power to an instance of bitcoind?

I'm not sure if those questions were asked this way before but ...: Is it possible to allocate CPU resources/hash power to an instance of bitcoind run on regtest?If yes, how? Assuming I'm going to ...
-1
votes
0answers
18 views

this router endure 50 miners ? which router is better for miners? [duplicate]

i'm interested me this router endure 50 miners ? i don't want that net turn off these on router ...
0
votes
1answer
21 views

lightweight wallets communication with blockchain

I understand how the Bitcoin core wallet communicates with the blockchain but how do the lightweight wallets like multibits, electrum etc. communicate with the blockchain? Thanks in advance
2
votes
2answers
60 views

Is there a way to access Ethereum Smart Contract's variables by name in JavaScript?

Say I have a simple smart contract: contract Simple { string32 message; function Simple() { message = "Hello world!"; } } How can I easily access the message variable by name ...
1
vote
1answer
19 views

What is NXT's Genesis Account's Passphrase / Password?

I remember there was a passphrase/password that gave you access to NXT's genesis account even though you can't do anything with it once you get in there.
0
votes
1answer
99 views

In Ethereum smart contracts is it cheaper to keep all the data, or delete old data?

As I understand, Ethereum smart contracts can store data internally. I am wondering - is it cheaper for a smart contract to keep all of its data forever if it is keeping the data for any length of ...
1
vote
2answers
99 views

Who pays the fees for transactions initiated by a smart contract in Ethereum?

I am wondering who pays the fees for transactions initiated by a smart contract in Ethereum? For example, if I have a contract that simply forwards any payment made into it to someone else, does the ...
0
votes
2answers
27 views

Pushing tx to the network via AJAX, without installing bitcoin

Is there any web service anywhere that allows me to push raw transactions to the network via an ajax call? Blockchain's pushtx only works if you copy/paste so I can't build around it.
0
votes
0answers
18 views

How do I identify my IP address on bitnodes?

I have supposedly successfully setup a node using the Bitcoin core, but when I go to bitnodes to remotely see if the node is communicating with the network, bitnodes says i am unreachable. Bitcoin ...
0
votes
1answer
17 views

OP_EQUALVERIFY: non-equal data

I'm trying to push the following transaction but keep getting OP_EQUALVERIFY: non-equal data Here's the transaction ...
1
vote
1answer
21 views

upgrading to bitcoin 0.10.2 fails

i am attempting to upgrade my bitcoin client on debian wheezy. i have been following the docs for this version and i installed berkley db to ${BITCOIN_ROOT}/db4 as directed. that went fine, but now ...
0
votes
1answer
14 views

Unable To Find Transaction Outpoint

I'm working on a project that involves constructing raw transactions and signing them locally before pushing to the network. I keep getting Unable To Find Transaction Outpoint ...
0
votes
2answers
31 views

Is Bitcoin practical? How does Bitcoin actually work in real life? It's a good way to invest? Did you use it only for shopping? [Edit] [closed]

How can I use Bitcoin? Is it convenient to convert euros/currency to Bitcoin and use it for shopping? Or is it better to hold the Bitcoin hoping for it to become more valuable and reconvert some back ...
3
votes
1answer
35 views

What is the “1 RETURN” bug?

From Nathaniel Popper's “Digital Gold : Bitcoin and the Inside Story of the Misfits and Millionaires Trying to Reinvent Money", this heavily edited (by me, for clarity) excerpt: “In late July ...
1
vote
1answer
15 views

Reduce Wallet Sync Time

So I am new to Bitcoin and I run the Bitcoin Core on my computer. I know that you need to wait for your wallet to sync before you can make transactions, but it says it won't finish syncing for 4 ...
0
votes
1answer
37 views

How could Bitcoin lending be secured? [duplicate]

I have been thinking a lot about platforms that allow us to borrow/make money. Such a platform would be really wonderful, mainly for people in countries such as Brazil, which has high taxes on ...
0
votes
1answer
6 views

How does the getblocktemplate request rate correlate with a miner's hashrate?

What is the relationship between a miner's hashrate and the getblocktemplate (GBT) request rate? (The question here, "How does the rate of getwork requests correlate with the hashrate of a miner?," ...
1
vote
1answer
47 views

BTC-e funding/withdrawal methods. Anybody tried any of these?

When one tries to deposit or withdraw, a dropdown list shows several choices, including Perfect Money, MoneyPolo, and OKPAY (and some other ones, including various cellphone-related ones with high ...
0
votes
0answers
9 views

How do I transfer my wallet from bitcoin qt to electrum without downloading the whole blockchain? [duplicate]

I made a big mistake: I downloaded the bitcoin qt wallet without downloading the blockchain, but I generated an address to send bitcoins to this wallet. And the blockchain says that I received some. ...
0
votes
1answer
26 views

What do the red and green blocks mean in a price chart?

What do the red and green blocks mean in this price chart? Source: Tradingview
1
vote
0answers
21 views

How to fork blockchain intentionally without RPC commands?

Are there any methods other than RPC command invalidateblock <hash> for creating forks? I know that forks occur when two miners (nearly) simultanously each generate a block for a previous common ...
1
vote
2answers
30 views

Send Bitcoin payments to any bank via API

I am looking into paying our overseas suppliers via bitcoin to speed up the process of settling invoices. The issue is that I don't want them to have to deal with bitcoin themselves. My question is ...
2
votes
0answers
28 views

How can a miner choose which transaction to include in the next block?

This question is not a duplicate of Can miners choose which transactions to mine? Everybody seems to agree on the fact that miners can select which transactions they are mining. But I can't find a ...
0
votes
1answer
21 views

Recover multibit.wallet data

I just recieved a payment sent me bitcoins on my old multibit 0.5.18 wallet. I opened it up and didn't see it, so I refreshed the blockchain. When I did this my wallet crashed. When I started it back ...
1
vote
1answer
38 views

Ramifications of creating Electrum 2.x seeds which are not BIP39

Electrum 2.0 seeds (mnemonic phrases) are created with a checksum based algorithm (such that the hmac_sha512 starts with 01. It's usually a 13 word seed, but can be 12 in some circumstances. If all ...
1
vote
1answer
53 views

will the upcoming block size increase be more profitable for miners, or less so?

according to this article: http://cointelegraph.com/news/114568/us-vs-china-the-20-mb-miner-war-that-could-destroy-bitcoin critical decisions are about to be made regarding the size of bitcoin ...
1
vote
2answers
30 views

txout script criteria (scriptpubkey critieria)

what is the criteria for a txout script to be accepted into a mined block? is there any criteria at all? the reason i ask is that OP_RETURN is regularly used in txout scripts yet it is not spendable: ...
0
votes
0answers
50 views

How to connect to antpool

So I'm using an antminer s3. I have been on btc guild for about a week. Today they announce they are closing. So I looked around and figured I would join antpool. The problem is when I changed all ...
0
votes
1answer
23 views

If port 8333 is closed, will a node relay transactions to its peers?

During a recent discussion, it was asserted that a node running Bitcoin Core behind a firewall with port 8333 closed would still relay blocks/transactions to peers. Unsolicited connections would be ...
1
vote
0answers
37 views

C# parse bitcoin blockchain to get balance of an address

Is there a way to scan the Bitcoin blockchain in C# without using an external API? I am looking for the amount of spendable money of a Bitcoin address. I am using NBitcoin. // create new key pair ...
0
votes
2answers
101 views

Buying BTC with PayPal, preferably automatic, mid 2015

Does anyone know if the Virwox method (buying "linden dollars" with USD from PayPal, and then exchanging linden for BTC) still works, and what are the limits, and cost? (in late 2013, if I recall ...
1
vote
1answer
32 views

Estimatefee value not corresponding to actual fee

When I call estimatefee 1 in testnet it returns: 0.00044444 Then when I call sendtoaddress xxxxxx 0,1 (which got the first confirmation within a couple of minutes after sending) I see that the fee ...
4
votes
4answers
91 views

Blockchain as a way to host truly free social website like reddit

Some time ago I started wondering: what if we create a new coin and use its Blockchain to store a website content? Bitcoin is P2P, that way it is almost impossible to block bitcoin. Everything in the ...
0
votes
1answer
32 views

What is the mechanism of determining the transactions of a new block

I am newbie in the Bitcoin field. I have read about the transactions, blocks, blockchain and other materials. As I know, when a new valid block is found and announced by a user, other users start ...
0
votes
0answers
28 views

block found in wallet, receving rewards, but not tracked by pool

i setup altcoin mining pool . some of wallets shows block found and receive rewards by miner , but not tracked block in pool. there are some wallets working well. ...
1
vote
1answer
38 views

transaction malleability “attack” vectors

are any of the following transaction malleability "attack" vectors currently feasible? alter scriptsig from: OP_PUSHDATA <sig> OP_PUSHDATA <pubkey> to one of: 1) OP_1 OP_SHA1 OP_DROP ...
0
votes
0answers
21 views

Why doesn't occasional minting secure the blockchain in coinage-based PoS cryptocurrencies?

The blackcoin whitepaper states that, in a PoS system based on coin age, nodes that save their coins online to mint them at intervals don't secure the blockchain, could somebody explain me why aren't ...
1
vote
2answers
82 views

When creating a block, who actually generates the 25 bitcoins that act as a reward? [duplicate]

I realise that somebody who manages to find a new block in the blockchain gets 25 bitcoins as a "reward". Where do these bitcoins actually come from? How are they minted? How are they actually ...
5
votes
2answers
100 views

Is it possible to buy half of a full bitcoin?

I've noticed that certain products online do not require a full bitcoin to purchase. My question is do you need to start with one full bitcoin in order to make a purchase of such items?
0
votes
1answer
37 views

bitcoind (JSON-RPC) returned HTTP 403 error, i don't know why

I set up bitcoind in Ubuntu 14.04 and I requested "getinfo", but returned HTTP 403 error "FORBIDDEN". I don't know why... The environment is below.. ・Ubuntu is installed in Virtualbox and bitcoind ...
0
votes
1answer
12 views

Automatic savings account using 2 wallets?

Sorry if this has already been asked; Stack Exchange didn't have this exact question in the "related" field. Let's say I have two bitcoin wallets. Somebody sends wallet 1 a transaction of 0.5 BTC. ...
2
votes
1answer
43 views

Why is the block header 80 bytes, not 128 bytes (= two SHA-256 blocks)?

According to the Bitcoin Developer Reference, the block header is 80 bytes total: BYTES NAME 4 version 32 previous block header hash 32 merkle root hash 4 time 4 nonce ...
0
votes
1answer
20 views

Where could I find Peercoin's documentation?

The whitepaper hosted in the official page is pretty lacking in "whys" so, is there anything that resembles https://bitcoin.org/en/developer-guide with Peercoin? Any technical papers?
1
vote
1answer
28 views

Bitcoin resistance against forged slow chain

I'm implementing a new protocol with a custom blockchain, and I'm trying to figure out what is the correct way to deal with the "slow chain" problem. In the Bitcoin protocol, nodes constantly gossip ...
0
votes
0answers
24 views

why to use blocknotify script, even if we can check for “share is block candidate” using target compare?

i have some complicate situation in altcoin wallet that wallet shows new block found with reward , but pool not show block found. could it be a reason that i not use block notify script. but checking ...
0
votes
0answers
18 views

Is there a site that list out all nodes of all crypto coins?

I would like to find out how many live nodes are there for all crypto coins. Its basically an aggregate of all coins with the number of live nodes each one has. Currently have have to goto individual ...

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