0
votes
1answer
5 views

How does the receiver of a transaction check the whole chain of ownership?

While reading Satoshi Nakamoto's paper on how bitcoin works, I got stuck on #2. In a chain of transactions, how can someone who has received the coin check the whole chain with just a signed hash of ...
0
votes
1answer
6 views

What shape of merkle tree does the Bitcoin client build?

The Bitcoin client builds a merkle tree to represent the transactions, then includes the root of that tree in the block header. But usually, the number of transactions is not a power of two. When ...
2
votes
0answers
13 views

Accelerated block generation

According to http://btc.blockr.io/ : Height Block created Transactions Block fee Size (kb) Days destroyed 318525 2 minutes ago 28 0.00370000 8.36 kB 2.00 318524 3 ...
0
votes
1answer
5 views

Can you transfer NXT assets directly to another nxt account?

I purchased a few mgwBTC (multigateway bitcoins) and I want to be able to transfer them to my other account. Is this possible? Can someone take a snapshot of how this is done? thanks.
0
votes
0answers
18 views

How to log onto bitcoin?

I logged onto Bitcoin couple days ago. I got as far as setting up a bank connection. I received in my bank account the two mini-deposits of Bitcoin had sent to verify the link. I tried to log onto ...
0
votes
2answers
24 views

How many OP_RETURN transactions in the Blockchain would be too many?

I realize this question may not have an answer and therefore might not be suitable for SE, but I'm very curious about OP_RETURN transactions. OP_RETURN transactions appear to be the accepted ...
0
votes
0answers
23 views

Standardize wallet format

What's the status of wallet format standardization? Is there any proposal or work-in-progress around? If not, how come nobody urges to define standard wallet formats yet? This is especially needed ...
0
votes
0answers
59 views

For people like me who missed the “Bitcoin train”, what form of investment would be the best at this point?

Like many others, I ignored bitcoin completely since the day it started. I thought it was a scam and didn't want to read more about it. After seeing how many people actually use it, I decided to do ...
0
votes
2answers
30 views

Is Bitcoin a developer only currency and community?

The Bitcoin repo on Github has 7 members. Ultimately, they decide what bug fixes and pull requests get merged. I don't understand how this is decentralized? Yes, it is open source, so anything they do ...
0
votes
0answers
9 views

How to detect a rejected transaction?

If the nodes I connect to don't support the BIP 61 reject message, how do I know that my transaction was eventually rejected by the network (e.g. due to my bugs)? Is there any timeout or whatever ...
0
votes
2answers
21 views

getbalance not working

I am getting this error when I type getbalance: error: {"code":-1,"message":"std::bad_alloc"} Basically, I type getbalance and wait for about 2 minutes and this error appears finally. What does it ...
2
votes
2answers
19 views

How can I search for transaction text on the blockchain?

Is there a google like search engine which can search for any text that is included with a bitcoin transaction? As I understand it each transaction includes 80 characters of text as well. Update It ...
0
votes
2answers
29 views

Payee identity verification

When reading the Bitcoin paper by Satoshi, I noticed that he didn't mention any protocol by which the payer can verify the payee's identity, i.e. he is indeed paying the intended recipient. I would be ...
-1
votes
2answers
24 views

Running many bitcoin miners

I wish to run many bitcoin miners , and of course , I would require a lot of LAN wires. As such , I would like to ask if there are any simpler ways to run many Bitcoin Miners using only a few network ...
0
votes
0answers
15 views

Overview of Blockchain 2.0 smart contracts for the layman?

I have a pretty good understanding of how the Blockchain secures data using hashed inputs of the previous block and being secured by the P2P distributed network. What I'm interested in is a layman ...
0
votes
0answers
9 views

BIP32 wallet sync with Bloom filters

I'm working on my SPV library and I still have a hard time figuring how to approach the BIP32 + Bloom filters combination. Here's how I currently sync an existing HD wallet (after fast catch-up): ...
0
votes
1answer
28 views

Why does the script contain the hash of the public key

The ScriptPubKey contains the hash of the public key, and this is compared to the public key in the ScriptSig. It is not possible to derive the public key from the hash (address). But when the output ...
2
votes
2answers
82 views

Defeating email spam with Bitcoin

There was a paper somewhere proposing a scheme for filtering email spam with the use of Bitcoin micropayments. I can't remember where I saw it and can't find it now. Anybody knows about it?
0
votes
0answers
3 views

How can I view all the NXT nodes that I can access publiclly?

Where can i find a list of NXT IP nodes that I can connect to publicly? I want to be able to use them as a backup connection to the nxt blockchain if my own nxt server crashes.
1
vote
1answer
31 views

New to Bitcoin - tips on securing my server

I regard myself as being a competent programmer and have good general IT knowledge; however I know very little about BTC. I just want to make sure that my setup is "generally secure" and that I'm ...
2
votes
3answers
44 views

Bitcoin vending machine

If I wanted to build a vending machine where one could buy a cola paying with bitcoin, is the following scenario the typical way to do it? Customer approaches the machine, and selects the product ...
1
vote
1answer
22 views

Running Multiple Full Nodes on one Host

simple question. I would like to run several full nodes for Bitcoin, Litecoin, Darkcoin and so on, but don't they run on the same port (8333)? Will this just work or do I need to give them several ...
2
votes
1answer
83 views

What does “Safe mode: Warning: The network does not appear to fully agree! Some miners appear to be experiencing issues.” mean?

My bitcoind client that runs on testnet has started returning a lot of errors today. It has been doing so for a few of hours (as of 2014-08-29 9:50 UTC). When I call it via RPC, I get the following ...
0
votes
2answers
26 views

Passphrase lost for my wallet.dat

Need help is unlocking my passphrase. I dont remember setting up one, but now there is a pasphrase. Eitherway I am unable to send out coins from my Litecoin QT to the exchange. Any help will be ...
0
votes
0answers
6 views

Can I force the Bitcoin core client to keep the blockchain on another drive instead of AppData/Roaming? [duplicate]

I have been profiling my disk space and found that the blockchain has become pretty big 25GB or so. I would like to force the core client to save the chain on another drive that is much larger. Is ...
0
votes
1answer
15 views

WIF Format and Storing Private Keys

I'm writing an Android app which will be storing private keys for Bitcoin and a few Altcoins in an SQLite database. To store my private keys, I was initially using the WIF. When I take them out of the ...
1
vote
1answer
24 views

Get a JavaScript notification when Bitcoin transaction arrives to a certain address

I'd like to implement a very simple address monitoring feature on a site I'm working on. I'd like to just be able to say "Listen to this address on the testnet for money to come in", and update the ...
-3
votes
0answers
45 views

What The Heck Do These Mean? [on hold]

I am relatively new to BitCoin and I have decided that I want to start mining them using my PC. While the 'BitCoin Armoury' wallet was downloading, I looked up some pools that I could join. Here's ...
0
votes
0answers
16 views

How can I refund from btc-arbs.com?

The title says all. I've invested some money in BTC-Arbs.com last year. Now it's down. how can I refund?
1
vote
1answer
46 views

Is it correct that more than 160 bits of input data for producing a private key are superfluous?

If this is true, when I make a 64 character hexadecimal private key I need only provide randomness for the first 40 characters (40 x 4 bits per character = 160). The remaining 24 characters can be ...
2
votes
0answers
24 views

Maximum number of transactions in wallet.dat for Bitcoin Core

I know that a large number of key pairs in wallet.dat is not a concern. But is having too many transactions in wallet.dat an issue? Can Bitcoin Core start crashing after it reaches a certain number ...
1
vote
2answers
21 views

Are time, timereceived and blocktime in UTC?

I read around about the differences between time, blocktime and timereceived, but one question remains. Although I assume all times are UTC, I haven't seen that mentioning specifically anywhere. Does ...
0
votes
0answers
14 views

When you sweep a private key at Blockchain can you sweep the key in HEX format?

It would be useful to know this because I have made a 64 character hex private key by hand and generated the address without storing the key in WIF format. I don’t want to go online, input the hex key ...
0
votes
0answers
11 views

what are BTR points in Bter exchange

what are BTR points in Bter exchange? Can we convert BTR into an alt-coin? If so, is there any fees they charge. How many times can I exercise this option for a particular month?
1
vote
3answers
56 views

Is there a way to buy bitcoin immediately?

I want to use PHP to write a script to buy bitcoins and my bitcoin balance will be updated immediately (i'm NOT in US). For example, I use my credit cart to purchase bitcoins. less than 1 min later, ...
1
vote
1answer
15 views

Any advantages in terms of our location & East-West timing differences for self mining on a 100 th/s btc rig

I do live in india.. I believe that bitcoin mining rig owners are very lessaound us ..I read some where that we will be able to mine more bitcoins while the west or far-east sleeps..
1
vote
1answer
37 views

Why should I pay in bitcoin as opposed to traditional payment methods?

Recently I have seen a few online stores starting to accept bitcoin as a payment method, but I can't think of a reason why I would ever want to pay in bitcoins. Since I get paid in GBP then I would ...
0
votes
1answer
22 views

Can I create a public address for Bitcoin without the private address appearing on the screen?

Is there JavaScript which will do this? I would generate a 256 bit password using 99 dice throws, enter it into JavaScript on an offline computer (like using bitaddress.org) and get an address to ...
0
votes
2answers
55 views

is it necessary to stay connected to internet [duplicate]

it could be a basic question for you guys, but i'm new in this. is it necessary to stay connected to internet while doing solo-mining ? is there any method to keep mining without permanent internet ...
2
votes
2answers
43 views

Can the service providing the bitcoin wallet know how much value has the user loaded into his wallet?

Say for example I run an ecommerce website which mandates users to have a minimum balance of 1 bitcoin in their wallets to access the platform. In the event the balance in his wallet falls below 1 ...
1
vote
0answers
8 views

can we create subjective trading platform using bitcoin and smart contract where payments are taken in stages?

Is it possible to create a subjective trading system (for eg: second hand goods like laptops, television cell phones etc) using concepts of bitcoins and smart contracts. Payments on the system would ...
-2
votes
0answers
17 views

BitcoinCZ Captcha [on hold]

Help when I am trying to log into my bitcoincz mining, I have to put in a captcha but no matter how I put it, it never registers and it says it is incorrect. Anybody have experience in this and can ...
2
votes
1answer
33 views

Are all private keys required to create a multisig bitcoin address

Do all 3 private keys in a 2-of-3 multisig wallet have to exist on the same device at some point in order to generate the bitcoin address? It would be ideal if the 3 private keys never existed on the ...
0
votes
1answer
17 views

Bitcoin packages

Are there any bitcoin package/librairies in popular langage that would make the recuperation of prices easy ? I have the exemple of the Quantmod package for R that allows you to get market data from ...
0
votes
0answers
14 views

Bitcoin in light of quantitative finance

I am looking for some reference on the Bitcoin market in light of quantitative finance. I am interested in some things: The market in general, how is it compared to other financial market ? It is a ...
0
votes
1answer
22 views

Getting transactions and time from Block Chain Info Api

I want to fetch transactions for an address from the following api: https://blockchain.info/address/$btc_address?format=json The thing is understanding the json returned from the api, I don't ...
1
vote
1answer
23 views

Test in a box duplicating addresses how come?

I copied the whole directory for bitcoin data and then ran two instances one for the first directory and the other for the copied one, and then I generated a new address from the old instance go to ...
0
votes
1answer
21 views

Bitcoin cloud trading

Is there a trading bots that trades automatically and can also be hosted by the company that is providing the service? I've found BTCRobot and Butter Bot. Any reviews on the validity behind these ...
0
votes
1answer
27 views

Which bitcoin miner ASIC can use without leave power on computer?

after search and read a lot of bitcoin miner posts in the web, yet I have one doubt before buy bitcoin hardware... I have read about ASIC Hardware of ButterFly Labs, Avalon, Knc, USB Erupter and ...
0
votes
0answers
23 views

BitcoinJS vs Armory

What are the pros/cons of using Armory vs BitcoinJS for a wallet service?

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