0
votes
1answer
41 views

How do I get the address that received a payment?

I am using BitcoinJ and wondering who user that I should credit, all users have their own receiving addresses. Please post an example also, if you have time. :) Current code: ...
0
votes
0answers
17 views

Bitcoin payment using blockchain API

We have used the bitcoin payment by using blockchain API. Amount is not transfer by using blockchain API. In include.php we have configured to our database.We expect to send amount from Account1 to ...
1
vote
0answers
17 views

Is *coin widely used for international migrant remittances (private money transfer)?

Bitcoin has been used by labourers in China to transfer money back home to their families, mostly because other transfers where more expensive. Many immigrants to richer countries support familiy in ...
2
votes
2answers
41 views

Why is halving the best time for block size increase hard fork?

Gavin Andresen said the best time to launch the block size increase update / hard fork would be the next reward halving (when mining discovery bounty would go from 25btc to 12.5btc). Why has halving ...
0
votes
0answers
29 views

How to start https and http call according to enviornments

I am using insight api's for block chain. I have installed an ssl certificate for secure connection. In development mode, all calls should be http; in production mode, all calls should in https. There ...
0
votes
1answer
23 views

Can a transaction be conditioned on signing another transaction?

I was thinking around http://lightning.network/ . My problem is Alice sending coins to Bob via Eve: A -- tx1 -> E -- tx2 -> B Is there a way to condition tx1 on Eve signing tx2?
1
vote
0answers
36 views

Historical number of full nodes in Bitcoin

Is there anybody keeping historical data regarding the number of full nodes on the Bitcoin network? There is : https://getaddr.bitnodes.io/dashboard/?days=90 but it only shows data up to 90 days. ...
0
votes
1answer
39 views

Wallet.dat (<0.4.0) format: retrieving Bitcoin, possible security concerns

Whilst moving houses I came across some old HDDs which I've just found contains a wallet.dat from August 2011. The version of Bitcoin-qt must be 0.4.0 as I know the wallet.dat is password encrypted, ...
0
votes
1answer
40 views

What sort of calculations do the miners have your computer do? [duplicate]

I recently heard of a new cryptocurrency (or maybe it's not new and I'm just out of the loop) called Gridcoin which uses your GPU/CPU/ASIC to do research calculations rather than "meaningless" ...
1
vote
1answer
18 views

Stopping Hash field in GetBlocks Message

Reading Bitcoin Developer Guide, I couldn't fully answer following question: What is the exact purpose of the Stopping Hash field inside a GetBlocks Message?
1
vote
1answer
22 views

Full list of RPCs

Where can I find a full list of RPCs that are not listed in the output of the help command? (such as invalidateblock etc.)
0
votes
1answer
38 views

Bitcoin.conf not being read by Bitcoin Core

My issue is I cannot get RPC working with Bitcoin Core. I do not know what I'm doing wrong! When I first installed Bitcoin Core it did not come with a bitcoin.conf file so I created one with the ...
2
votes
1answer
54 views

Assuming that the block size fork goes through, will the Bitcoin developers use the alert key to tell people to upgrade?

The block size increase proposal currently under discussion would require all clients that process transactions to upgrade. Otherwise, pre 0.11 clients would reject these larger blocks, leading to a ...
1
vote
2answers
32 views

Cold storage companies?

I was curious to know if anyone knows of any bitcoin business that stores people's wallets offline? I'm looking to diversify my backup methods for cold storage and am wanting to send my backups to a ...
2
votes
1answer
35 views

Pairing pattern of txids in merkle tree

For constructing the merkle tree txids are paired and hashed. ¹ But how are these txids paired? Does it happen chronologically or is there a certain pattern of pairing?
0
votes
0answers
12 views

How would one mix NXT coins?

How would a user mix their NXT coins so they cannot be linked to previous accounts that sent it to the user? One way I thought up of was to deposit your NXT coins into an exchange and take it back out ...
5
votes
6answers
4k views

How to answer to whether Bitcoin is a Ponzi scheme?

I was asked whether Bitcoin is a Ponzi scheme as I was explaining Bitcoin. In support of the question I was presented with the following scenario. I didn't know what to answer. Let's assume ...
2
votes
3answers
47 views

Which files do you recommend I start with to learn Bitcoin?

In the bitcoin/src, which files are the "main" files I should start with if I want to learn how Bitcoin works? In other words, where's it good to branch off from? I'm new to C++, but can code okay in ...
0
votes
1answer
46 views

Alternatives to OP_RETURN to store data in Bitcoin blockchain

I am working on iOS camera app and would like to store hash of photos inside blockchain for the "proof of existence". AFAIK transaction with OP_RETURN in output has some disadvantages ...
1
vote
0answers
46 views

Expectancy of payout from bancrupcty claim mtgox

Now it is possible to file a proof of claim regarding the mtgox bancruptcy. What is the most likely outcome of this claim? What is the expectancy one can have as a former mtgox user on this claim?
1
vote
2answers
71 views

How to check BTC transaction when buying face to face?

I have never bought bitcoins face to face. Don't have iphone/ipad and therefore I would need answers on the following question: What do I need to have on my cell phone in order to provide seller my ...
0
votes
1answer
23 views

Can one set how many confirmations MultiBit requires for a transaction to be accepted?

Is there any way for users to specify the number of confirmations for a transaction? If not, how many confirmations does Multibit require to complete a transaction? And does the required default ...
0
votes
0answers
11 views

How does the SuperNet NXT Multigateway Exchange work?

I'm still trying to figure out how the multigateway exchange works for nxt. i see you can put your bitcoins and other altcoins into the system and trade on top of the asset exchange using the nxt ...
1
vote
1answer
39 views

Transaction inclusion into block

What are reliable and good sources for understanding the procedure of transaction inclusion into a block? Problem outline: Given, there are multiple peers - let's say 5 - in a test network, where 3 ...
0
votes
1answer
29 views

Regtest: One node nullifying other node's balance

I'm running 2 bitcoind servers on the same machine, called node0 and node1. In the following I'm listing steps I take and results I get and I'm wondering what is causing one node nullifying other ...
1
vote
2answers
38 views

Generating blocks in regtest: “hash doesn't match nBits”

I'm getting this error in regtest mode after setgenerate RPC: ERROR: CheckProofOfWork() : hash doesn't match nBits After looking for error text in src I found a match in pow.cpp (obviously ...
2
votes
1answer
23 views

What are these strange outputs in the Litecoin blockchain?

I have found that there are some strange outputs in the Litecoin blockchain that pay small amounts to the scriptPubKey 736372697074. In ASCII, this translates to "script", reminding me of how nodes ...
2
votes
1answer
53 views

what are my tax implications for cryptocurrency?

Do I pay any taxes to purchase or sell bitcoin? If I use a Bitcoin debit card and withdraw USD from an ATM, is it a taxable event?
1
vote
2answers
71 views

Calculating “total received” and balance by an address

This is something which I think should be simple but it's driving me crazy. See for example this list of transactions associated with an address: ...
1
vote
1answer
35 views

Taking control of the dynamic bitcoind tx fee

I'm running bitcoind for a service that works with quite small user withdraws most of the time. Recently I noticed that instead of the standard 0.0001 tx fee from the recent past, it already charges ...
2
votes
1answer
40 views

How does Electrum make a keypair out of a seed?

Electrum uses a seed of 12 words to generate a keypair and then hierarchically generates addresses out of that keypair. I know how to generate hierarchic addresses from a keypair, but what I don't ...
1
vote
1answer
31 views

Transaction too large error

I have over 1400 small transactions in my wallet that add up to a little over 0.2 BTC. I am trying to send them, but keep getting a transaction too large error. I have tried to set a custom ...
0
votes
1answer
33 views

Two identical transactions and hashes in Block Hashing algorithm

As I was reading Bitcoin hashing algorithm, I see that a Block Header contains hashes in the form of fields like hashPrevBlock , hashMerkleRoot . I have following questions: 1) Are the transactions ...
-2
votes
1answer
61 views

Does having twice as many miners give you twice as much revenue?

A good friend lives in an apt that includes utilities in his rent and I'm going to lease a desk space in his pad to mine bitcoins. I have a few questions before I get started. All of the mining ...
1
vote
0answers
41 views

How to sign a transaction using BitcoinJ

I am having problem signing the transaction using BitcoinJ library without the Wallet instance, I only have the Transaction class instance and the ECKey in order to sign the transaction. Is there a ...
-2
votes
2answers
68 views

What is the future of the bitcoins? [closed]

It said that the last two years, bitcoins has been losing value. What would happen in the future? And what is the reason of this?
0
votes
1answer
87 views

Is it possible to use Selfish Mining to steal bitcoins?

Is it possible to use the Selfish Mining algorithm to steal bitcoins?
1
vote
1answer
50 views

OP_RETURN using python

I'm trying to make a simple program that can reliably upload an OP_RETURN transaction. I have found some examples online, but so far they don't work consistently. The ones that go through seem to be ...
1
vote
1answer
43 views

What is the most efficient way to store bitcoin addresses in a database?

Let's pretend I wanted to store 1MILLION btc addresses in mysql, I thought about saving the last 10 digits of each submitted address and testing against that but would 10 characters be enough to ...
5
votes
1answer
60 views

What is the maximum size of the memory pool?

The memory pool holds unconfirmed transactions in RAM. It seems that memory pool storage could overflow if no block is solved for a very long time and many transactions are published within a short ...
4
votes
1answer
81 views

Have the security vulnerabilities found in Bitcoin been fixed in other altcoins?

This page maintains a list of vulnerabilities found in Bitcoin, and when they were fixed: https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures Are major altcoins, being based off of the ...
1
vote
1answer
58 views

What is the most lightweight proof-of-work algorithm?

I know litecoin was created back in the day using Scrypt as to make it more lightweight but also harder to build ASIC hardware from - so everyday computers could mine. Are there other algorithms one ...
2
votes
2answers
41 views

I am looking for a reliable and low cost way to make loan repayments from Asia to the US. Are there any banks in the US that will acept Bitcoins?

I'm looking for a reliable, low cost, transparent and efficient way to make monthly loan repayments from Asia to the US each month. Are there any banks in the US that will accept bitcoins? So, I'm ...
3
votes
1answer
26 views

Recurring Bitcoin or Altcoin Payments as a Service?

I was wondering are there any recurring payment services aside from the obvious coinbase one out there. I want to be able to have a finer grain control. Say I wanted to send X amount of btc/altcoins ...
1
vote
1answer
42 views

Can I verify a sub public key came from it's parent public key in a HD wallet without involving any private keys?

I know I can sign a piece of text using a bitcoin private key to prove control over a public address but are there any operations I can perform to know if a public key submitted to me was derived from ...
1
vote
2answers
31 views

How are SIGHASH flags encoded into a signature?

This page describes SIGHASH flags: OP_CHECKSIG extracts a non-stack argument from each signature it evaluates, allowing the signer to decide which parts of the transaction to sign. Since the ...
3
votes
1answer
46 views

Is there a way to index transactions so that filterload commands can be answered without iterating through all transactions in a block?

Some SPV clients use the filterload command to only receive transactions to involving addresses in their wallet. Doing this takes the remote node linear time (with respect to the number of ...
1
vote
0answers
17 views

Single address wallets - no change addresses [duplicate]

Is it legal for Bitcoin transaction to spend output back to one of the input addresses? Namely, to create a single address wallet (paper wallet), so that change addresses do not need to be generated. ...
0
votes
4answers
74 views

How to get unspents for a specified bitcoin address?

I want to access unspent data of a specific bitcoin address. I am trying this command bitcoin-cli -regtest listunspent "some bitcoin address" But I am always getting an empty list. I am using local ...
3
votes
2answers
145 views

Open source ASIC design plans in Hardware Description Language (HDL) format?

Are there any freely-available ("open source") ASIC design plans in, e.g., HDL or AHDL format(s)?

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