1
vote
0answers
143 views

Why are double-spends bad? [duplicate]

In the answer to this question it is stated the bitcoind filters doublespends. What is the reasoning behind this?
0
votes
1answer
23 views

How to tell which account an unspent vout is in?

When I go to send coins, I want the transaction to ignore the unspent coins in a certain account. I think I can do this in wallet.cpp, but I'm not sure how. Maybe in the AvailableCoins() function? ...
0
votes
3answers
56 views

How can an online wallet be more secure than paper wallets or cold storages?

Recently, after I was reading that some bitcoin early adopter lost 750 BTC due to theft from his macbook, I was looking for the most secure storage solution for my coins. I already know about paper ...
0
votes
2answers
41 views

The Ideal Reserve is cryptocurrency?

Is The Ideal Reserve a cryptocurrency? I need my currency to keep a stable price. Is it stable? I live in a country where cryptocurrencies in general are illegal. Is The Ideal Reserve ...
0
votes
3answers
64 views

Why block height is required in coinbase?

While reading bitcoin source I found this short comment: // Height first in coinbase required for block.version=2 (From https://github.com/bitcoin/bitcoin/blob/master/src/miner.cpp#L338). Why this ...
0
votes
2answers
44 views

Can decentralized blockchain technology like bitcoin be used to store medical information? [closed]

For example patients get private key, providers get public key?
1
vote
1answer
24 views

Blockchain transaction message length limit

When I perform a transaction on the blockchain, I can add a message to the transaction, which will then exist forever in the blockchain. Say for example I wanted to use the blockchain to store ...
3
votes
2answers
64 views

Accepting 0-confirmation transactions and detecting double-spends with open source solution

I would like to accept 0-confirmation bitcoin for very small amounts. I am happy to accept zero-confirmation spends and am aware of the risks. However, the tool needs the ability to "flag" the ...
0
votes
1answer
24 views

How can address' hash160 be used to determine information for malicious purposes? (Ie reusing of the same address)

I've been playing around with Richard Kiss's Pycoin app which is clarifying how P2PK works. I see that the hash160 of the value: (0x04) (x-coordinate) (y-coordinate) (for an uncompressed Testnet ...
1
vote
1answer
15 views

iPhone App for Bitcoin trading / transfering?

Is it any iPhone App that I can use to buy / sell / transfer easily Bitcoin? I want to be able to download from Apple's App Store.
2
votes
2answers
36 views

Is bitcoin vulnerable to a DOS/spam attack?

What happens if someone maliciously decides to make squillions of transactions on the Bitcoin network? I see there being two vulnerabilities. Firstly - computation resources used, though this ...
1
vote
1answer
37 views

Can someone explain the pitfalls of NXT Proof of Stake's potential issue of “nothing at stake”?

Many people talk about NXT Proof of Stake (PoS) being insecure due to the "nothing at stake" problem. I read up some posts about nothing at stake, but I still do not understand how it works. Can ...
2
votes
2answers
92 views

What are some of the proposed ideas to why the Bitcoin dropped to sub $400 in the end of summer 2014?

Having seen that BTC was around $600 early summer of 2014 (May-July). It is currently almost 50% of that value. I read many varying reports of the cause of such a big drop. Can someone give a list of ...
1
vote
0answers
37 views

Main Differences from Counterparty vs NXT Assets Exchange (SecureAE)

What are the main differences from counterparty and NXT asset exchange? I've been testing out the nxt asset exchange using http://www.secureae.com and using counterwallet. They both seem to be solid ...
0
votes
1answer
14 views

Check password for ethereum wallet

I have ethereum wallet and wish to check if some password was used to create it. How this could be done?
1
vote
1answer
30 views

How does Zerocoin work?

How does Zerocoin work? I got the idea that it is used to add anonymity in bitcoin. It converts bitcoin to Zerocoin and back to bitcoin. But how does this process work? I tried reading the research ...
0
votes
1answer
14 views

How do I run Armory Testnet on Win7 x64 using Bitcoin Core 0.9.3 using remote datadir?

Trying to use the testnet which I have no problems with using Bitcoin Core 0.9.3 with command: Bitcoin-qt.exe -testnet -datadir=f:\data\bitcoincore But running Armory using the Testnet icon attempts ...
0
votes
0answers
13 views

0 confirmations after several hours [duplicate]

I sent off a bitcoins from the bitcon-qt client to fund another bitcoin wallet and it has been seveal hours and there are still 0 confirmations what can I do about it? I have a mac and I am at a loss ...
1
vote
1answer
36 views

End-user security measures to protect your Bitcoins

I am trying to make a presentation on Bitcoin for my Security and Risk Analysis class. Currently, my research question is : What bitcoin security measures can enhance user-protection and reduce ...
1
vote
0answers
8 views

Banking partners with UK Faster Payments

What is the easiest way to have access to UK Faster Payments facilities as a Bitcoin business? The UK banks have been quite hostile. Can Bitcoin businesses have access to the Faster Payments network ...
-1
votes
1answer
37 views

Detailed guide on how to Create a Litecoin Fork, With Pre-mine instructions [closed]

I need a Detailed guide on how to Create a Litecoin Fork, With Pre-mine instructions, I would be very grateful if someone posted a comprehensive guide on how to Create a Litecoin software fork, with a ...
6
votes
4answers
334 views

How to find a specific bitcoin address from all the addresses?

Recently, I found a site that show all the addresses in a huge list, divided in 904625697166532776746648320380374280100293470930272690489102837043110636675 pages. The site's link is ...
-1
votes
1answer
81 views

After 21 million bitcoins [duplicate]

After 21 million bitcoins miners will be paid certain transaction fees but I need your guidance for clarifying following confusions:- Currently solving a block gives you 25 bitcoins but what is the ...
4
votes
1answer
33 views

Is there a class or sequence diagram for BitcoinCore?

I'm looking at the code located at https://github.com/bitcoin/bitcoin/tree/master/src Does anyone have a basic diagram of what calls what, just a sequence chart of how all the classes piece together ...
0
votes
0answers
7 views

What is a safe way to buy bitcoins from Japan? [duplicate]

I live in Osaka, far from Tokyo. I know there is bitcoin ATM in Tokyo, but how can I buy bitcoins from Osaka? Or is there any international company that will let me buy bitcoins via bank wire ...
0
votes
1answer
102 views

Why is the address 1MAdS7aPszWG4EYgBpbF9mnGUi5ChbMu8d sending me Bitcoins?

I'm receiving 1 satoshi today from an odd address. This account has been very consistent in creating spammy transactions that distribute 1 satoshi to a lot of account. Any one know what's going on ...
0
votes
0answers
11 views

GUIminer is mining but shares not showing up in my bitcoincz account

GUIMiner is collecting shares but on bitcoincz it is saying no shares or anything for my worker.
1
vote
1answer
38 views

Growth Dependent Block Size Limit

Could the 1MB block size limit be replaced with a growth-dependent limit? From what I have read (here, for example) the 1MB limit is to prevent spamming of the blockchain. And if/when Bitcoin becomes ...
0
votes
2answers
32 views

How much binary data (bytes) could I put in a transaction and how?

I know that some people had put text, pdf and images in the blockchain. I wonder which are the limits in order to have a minimum "bytes/btc" value in regarding the blockchain as a permanent database. ...
0
votes
1answer
62 views

Unconfirmed Transaction using Blockchain.info wallet [duplicate]

I sent 0.08 BTC yesterday using the blockchain.info wallet on the iPhone. It's been 24 hours and my money is still unsent; I really don't know what to do. It still says unconfirmed. Why is this? ...
0
votes
2answers
41 views

Hash property resistance

I'm experimenting with some self study cryptography and I was curious about the two following scenarios (simple answers and/or in relation to bitcoin) If SHA256 was found to lack pre-image ...
0
votes
2answers
61 views

Total number of Bitcoins generated by pool mining

Hi I'm doing some research regarding bitcoins and pool mining, however I couldn't find the following information online. Total number of Bitcoins generated so far by pool mining and how many miners ...
1
vote
1answer
136 views

Motivation to run full nodes

I'm sorry if I ask a stupid question. Bitcoin network was conceived by Satoshi Nakamoto as a decentralized network, but now we are seeing the full centralization of nodes in the United States. The ...
1
vote
2answers
54 views

Can you encrypt not just the private key, but also the public keys (ie bitcoin addresses) in an Armory wallet?

I would imagine that the paranoid darknety bitcoin user has an interest in keeping not only their private keys safe (so nobody can steal their bitcoins), but also has an interest in keeping their ...
0
votes
1answer
23 views

Migrate wallet from Bitcoin Core to Armory

I have installed Armory. I have created a wallet within the Armory. I however would like to use a wallet I have with bitcoin core. I am unsure how to do this. Thank you for the help. All I have ...
1
vote
1answer
50 views

Laymans guess to determine how many hashes must be computed to you find a specific value

I have a question about bitcoin, lets say that the output is uniformly random and that it is 256 bits in length. The output of the hash function y=H(t) begins with 25 zeros - how many times would one ...
1
vote
2answers
48 views

How to Create a new Genesis Block with some bitcoins initially asigned to some users?

I am trying to use Bitcoin's code for some other application. Is it possible to create a genesis block so that I can initially assign some coins (bitcoins) to some users. For e.g. The Genesis Block ...
0
votes
1answer
40 views

Blockchain Parser not working on blockchain generated in regtest mode using bitcoind. Any help?

Has anyone used this blockchain parser for Bitcoin https://code.google.com/p/blockchain/ ? http://codesuppository.blogspot.in/2014/01/a-command-line-interface-for-blockchain.html I tried to parse ...
2
votes
2answers
51 views

How do Bitcoin transactions work, and what does one need in order to send or receive one?

I am trying to understand how Bitcoin works and whether it is possible to manage a bitcoin transaction anonymously. If someone transfers a bitcoin, what do I need to sign it with? Can it be signed ...
4
votes
1answer
61 views

What are the benefits of Invertible Bloom Lookup Tables for Bitcoin?

Gavin Andresen announced a few days ago, that he started working on Invertible Bloom Lookup Tables. His repository's README refers to two papers, What's the difference?: efficient set reconciliation ...
0
votes
1answer
24 views

Allowing bitcoind startup script to access daemon commands

I'm trying to create multiple full nodes on a single machine each using a different data directory and static ip's. My directory layout is ~/bitcoin1 ~/bitcoin2 ~/bitcoin3 For each ...
0
votes
1answer
18 views

Decentralized product inventory (instead of simple orderbook)

I am thinking of creating a decentralized market place with public bidding. AS far as I have researched all cryptocurrencies and such only offer public ledgers with simple orderbooks. The only data ...
0
votes
1answer
28 views

Bitcoin-qt and lost local blockchain files

For some reason I've lost all data in my .bitcoin directory except the wallet.dat file. Now bitcoin-qt shows 0 balance, and it's 5 years behind sync. Is this possible to restore coins in this case?
1
vote
1answer
35 views

How to set a payment in Ripple without specifying currency issuers?

I want to send IOUs from one of my accounts to another through the use of the API. Both of the accounts trust the same IOU issuer, which is a separate address. According to the Transaction Format, I ...
0
votes
1answer
24 views

Local Testnet3, where do the new coins get sent to?

I'm trying to setup a local testnet with multiple nodes. Currently I have three nodes, and their mining powers are almost the same. When I use listaccounts RPC call, all the wallets have 0 coins. ...
0
votes
2answers
21 views

What's the minimum transaction with nxt?

Currently the minimum transaction on Bitcoin is 5430 Satoshi, and what about NXT?
0
votes
1answer
23 views

Why do Bitcoin API services offer Block details?

I understand having APIs around addresses and transactions, but I'm less clear why I need to know what's happening with a Block(s). This is to confirm one's transactions? Might someone provide some ...
3
votes
2answers
208 views

Why do transactions with lower input age require higher fees?

I am trying to understand how bitcoin fees work. I have understood well why transaction with many inputs require higher fees but I can't figure out why transaction spending virgin bitcoins would ...
1
vote
1answer
33 views

Bitcoin testnet: “Bitcoin is downloading blocks…” and other problem

I'm trying to setup a local testnet with multiple nodes. Currently I have three nodes, and their mining powers are almost the same. Things have been quite ok so far, except some problems that I need ...
2
votes
3answers
60 views

Inevitable dust spam

Given I have an account with balance 1BTC + 1 satoshi. I want to transfer 1BTC to another account and tribute 0.0001 BTC out of that 1BTC to the network as fee. Would my transaction being rejected for ...

15 30 50 per page