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Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

252 questions with no upvoted or accepted answers
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5
votes
1answer
1k views

How do I remove Wallet from Bcoin?

I'm playing with bcoin cli and created lots of wallets. Is there any way to remove wallet via WalletDB Api?
5
votes
1answer
372 views

Can*t call chainActive.Tip()->nHeight in core.cpp

I want to call chainActive.Tip()->nHeight in core.cpp. It is not possible, I am interested in every idea. https://github.com/LIMXTEC/BitSend/blob/DEV-joshafest/src/core.cpp Here is an example : ...
3
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2answers
120 views

What information is available from the blockchains of privacy currencies?

Some currencies such as Monero and Zcash focus on protecting user privacy as much as possible. What information is available from the blockchains of these currencies? Number of wallets? Transaction ...
3
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0answers
488 views

Verification progress decreasing when validating genesis block

I've been experimenting with the litecoin source and have decided to make my own token network for personal use. I've mined my own genesis block, and assigned unique identifiers for base58Prefix and ...
3
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0answers
484 views

blockchain - Anti-virus service

I hope this is the right place to ask a question on how does block-chain help this theoretical requirement. I have also asked this question on SO; so far, no response. And, Ethereum SE is still in ...
3
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0answers
751 views

Querying insight-api to dump all addresses with a positive balance

It's been some time I've been using 'insight-api' (https://github.com/bitpay/insight-api) and I couldn't find any documentation / anything helpful to query leveldb in a way that all addresses with a ...
3
votes
1answer
166 views

What is the best way to implement withdrawal in online service?

Suppose we have a service, which holds user balance in Bitcoin. How to implement withdrawal from bitcoin perspective? Which RPC call to use? How to archive transaction to have a proof of sending ...
2
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0answers
28 views

How the process “ lock a certain amount of coins into the network as their stake” achieved technically in the Proof of stake algorithm

i am trying to understand deeper the proof of stake algorithm. i think i understand the basics but i am struggling to understand how this achieved thoroughly under blockchain network and how the nodes ...
2
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1answer
59 views

How do different implementations of the Bitcoin Cash client know which type of coin they're processing?

TL;DR: Where in this code does the SV client figure out that it's not processing an ABC blockchain? This image prompted my question. There are a couple different mutually incompatible (I am assuming ...
2
votes
1answer
110 views

Different balances in API block explorers for BTC

BTC.com block explorer shows bigger balance than for example Insight or Blockchair. For example: https://btc.com/1FLDCfr9iG7n6bAdGsqBXmhaLgC4aSze72 https://insight.bitpay.com/address/...
2
votes
2answers
139 views

API for multiple blockchains

Is there an API to get data for multiple blockchains? Most blockchain explorers already offer an API but I'd like to be able to get information for different blockchains through the same API.
2
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0answers
134 views

Is my understanding of Blockhain Endianness correct?

I know questions on this topic have been asked to death in a number of different ways. I also know that what endian order refers to specifically is dependent on context. What I want are some ...
2
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4answers
2k views

Are there any opensource PHP cryptocurrency exchange/marketplace

As the title suggest, are there any opensource PHP cryptocurrency exchange/marketplace. Most of the ones I found does not seem to work or are abandoned.
2
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0answers
144 views

Blockchain explorer for regtest mode

I'm looking for a Bitcoin blockchain explorer that will work in "regtest mode", mostly for demo proposes. Any suggestions?
2
votes
1answer
65 views

Shorter Chains in blockdata

Assuming two blocks are published at exactly the same time, a race for the next block to be added to one of them begins, which eventually one chain will eventually win. My question: will the shorter ...
2
votes
0answers
316 views

How to delete last n blocks / roll back to specific block number in Bitcoin Core? (Like `monero-blockchain-import --pop-blocks n`)

I have Bitcoin Core's bitcoind running and synced in a VM. Now I want to clone the VM and run one of the various hard forks (such as Bitcoin Cash) in the clone. The plan is to roll back my copy of the ...
2
votes
0answers
74 views

Question about BIP70 and bitpays recent card top up changes

Okay so bitpay just sent out an email that outlines some changes to their card top-up process. Apparently, they are implementing BIP70 and I am honestly not very familiar with what exactly that is. I ...
2
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0answers
1k views

Is there any blockchain-based mail services available?

According to technology behind the Bitcoin, I'd be interested in using decentralized blockchain-email. Cryptamail was only one I found but they've been told that it is in beta right now but last ...
2
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0answers
92 views

The blockchain lookup speed in a local machine

How to determine the exact required time (seconds, milliseconds) to find a particular block when searching within a local blockchain using address? Is there any way to make a benchmark to study the ...
2
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0answers
232 views

bitcoind verifychain vs reindex

actually this is not Bitcoin but Litecoin 0.13.2 on Linux Mint, litecoind stopped with "bus error" just on start verifying blocks: tail ~/.litecoin/debug.log ... 2017-05-06 21:15:26 Verifying last ...
2
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0answers
111 views

Method to measure “distance” between 2 transaction id's

Is there a blockchain tool/code that takes two BTC transaction ID's and determines a distance between them. It's 2017 and Bitcoin Privacy (aka trying to walk around in the public without a sign over ...
2
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0answers
217 views

Can't access Blockchain.info API using ASP.NET

I am using ASP.NET(VB) to call API Try Dim strUrl As String = "https://blockchain.info/tobtc?currency=USD&value=500" Dim request As WebRequest = HttpWebRequest.Create(...
2
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0answers
201 views

Is there a robust way to test for a corrupted blockchain?

While running bitcoind I once had the blockchain get corrupted and it manifested as a non-obvious error message which unfortunately I can't remember. I would like to know if there is a robust way to ...
2
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0answers
235 views

How do i loop through all the related address in a given wallet address

I am using bitcoin block chain API, it is possible to get amount sent in a transaction id and the addresses it was sent to. My problem is getting the RELATED ADDRESSES to the address that sent the ...
2
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0answers
330 views

Synchronisation stopped at one specific blockchain

I've successfully been using Bitcoin core for the past months, but since two weeks ago its synchronisation is always stopped at the exact same blockchain. 2 weeks later, sync is behind by 2 weeks. And ...
2
votes
1answer
896 views

bitcoind crashing due to insufficient memory?

EDIT 3 Bumping my VPS to 1GB of physical RAM stopped the crashing issue... UNTIL said VPS ran out of disc space. I added prune=10240 to my ~/.bitcoin/bitcoin.conf file such that the blockchain file ...
2
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0answers
101 views

Can we know the address list which blockchain API has created?

I am currently using blockchain payment API. This API has created the addresses for receiving payment. https://blockchain.info/api/api_receive Can we know the list of unused addresses this ...
2
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0answers
139 views

Iterating through LevelDB or .DAT files to enumerate bitcoin addresses

I'm looking for a library that can parse either the .DAT files or the .ldb files to enumerate bitcoin addresses. Alternatively, if that can't be done via the standard .dat or .ldb, I'll take a ...
2
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0answers
383 views

How will Bitcoin and the Blockchain scale in the future?

I wonder how the whole Bitcoin blockchain system will scale in the future. Given the fact that the size of the blockchain will grow exponentially (roughly a tenfold every ~3 years, looking at the ...
2
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0answers
102 views

Bitcoin .11 Initial Blockchain Download Problem with OS X 10.10

I am loading the blockchain for a new wallet. Initially I had problems due to ISP issues. This issue is fixed and I now have 8 outbound connections working well with ping times ranging from 50-800 ms. ...
2
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0answers
190 views

Get as many blocks as possible (stale, invalid, orphans)

I would like to download (and access) as much blocks as possible - including stale (extinct) blocks, orphans blocks and invalid blocks. I have 0.11 official client. My node is already synchronized but ...
2
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0answers
127 views

What restrictions does merged mining place on the sidechain?

What restrictions are imposed by merged mining on the structure or functionality of a side chain (besides it having to use the same PoW schema)? For example, could the side chain have a higher block ...
2
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0answers
179 views

Filter transactions per block 50 BTC or Higher

I'm using the blocktrail python api, to try and display transactions above 50 BTC per block for a visualization project. I think I'm almost there but can anyone help me understand where I'm stuck? ...
2
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0answers
772 views

Just installed bitcoin, but it won't connect

Total newbie at bitcoin; long time Linux user. kubuntu precise 64: My first attempt was just to download it (a slightly older version than the one from the ppa below), untar it and run the executable....
2
votes
0answers
248 views

Bitcoin-qt database for BitcoinJ downloadBlockChain()

I am using bitcoinJ to develop a bitcoin based payment module for my project. I have the complete block chain downloaded/in sync with the network on the bitcoin-qt client. Is there a way I can use ...
2
votes
0answers
88 views

How can I record block solve times on OSX?

I need to be able to record the times blocks are solved as they are solved. Bitcoin-abe would be nice (overkill, actually) but I can't get it working on my mac. Anyone know of a mac compatible method ...
2
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0answers
656 views

How to use downloaded blockchain on ubuntu?

I am using a fresh install of Bitcoin and have no wallet with coins at this time, and want to use the Bitcoind service in short time (loading blockchain using bitcoind will take days because of slow ...
2
votes
1answer
497 views

What is the required input for python-bitcoinlib getrawtransaction command?

I am running a bitcoin node on my machine, fully synced with RPC commands enabled, rpc server live and txindex=1. In the command-line I can run the following RPC call and obtain the information ...
2
votes
1answer
709 views

Analysis on the Block Chain for Dead Bitcoins

My understanding is that the blockchain is currently 6.5 GB in size and will continue growing at a fairly hefty rate. Has anyone attempted to analyze the blockchain to attempt to determine dead ...
1
vote
0answers
28 views

Unknown command name and packet magic for bitcoin packets at the start of blockchain transactions

Recently I captured a part of blockchain when my bitcoin wallet started to syncing for the first time. I analyze about 10 Gb of traffic which was for primary transactions of bitcoin. wireshark can ...
1
vote
1answer
34 views

Timer-based consensus algorithm in blockchain

Assume that there is an algorithm that ensures: 1- That a full node chooses an honest random wait time. 2- That the same node has waited the specified amount of time before proceeding to mine a block. ...
1
vote
1answer
54 views

Is it possible to separate blockchain and wallet functions?

I'm looking for a way to use bitcoin-core in monero-way (It uses separate blockchain daemon and wallet daemon). I'd like to run bitcoin-qt interface on my laptop and connect to external node with ...
1
vote
1answer
67 views

How do I make my coin seeds?

I want to add DNS seeds – like bitcoin – to my alt-coin. Is bitcoins generate-seeds.py and makeseeds.py the scripts to register DNS-seed ips?
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0answers
20 views

Blockchain, correction of blocks

How do a malicious nodes correct their blockchain if they have it wrong? If they don’t want to fix it, what happens then?
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0answers
22 views

Does everything of a Blockchain Network rely on its underlying “Consensus Protocol”?

I have been reading about and researching on Blockchain Technology for quite a while now, and what I can comprehend from the very primitive architecture of these "Distributed Databases" is that ...
1
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0answers
24 views

How is the fault tolerance measured?

“If the number of nodes that agree exceeds 2/3, the blocks or transactions of clients will be accepted” Practical Byzantine fault tolerance (pBFT) : (n - 1) / 3 I read those 2 things in a PDF that a ...
1
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0answers
70 views

Proof-of-Stake: How to ensure immutability of the blockchain?

In Proof-of-Work, a miner tries to solve PoW puzzle based on the hash of previous block, such that in case of changing block B_i, all blocks after that (blocks B_i+1, B_i+2, ...) are no longer valid ...
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0answers
55 views

Can I transfer it from the wallet file of blockchain.com?

Can I transfer it from the wallet file of blockchain.com? Since trouble continues at blockchain.com, I want to transfer it to bitcoincore.
1
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0answers
76 views

How does the bitcoin network remove duplicate blocks being generated by multiple miners?

Say there are two minersA&B and each of them have produced the next block almost at the same instant. In this situation how is the network going to decide which one is the main block and abandon ...
1
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0answers
42 views

UTXO are not being listed while they have conf over 100 (btcd + simnet)

I am using BTCD and while in Simnet, I generated 104 block (Best block : 104) But when I listed utxos, transaction from block 3 and 4 (which have 102 and 101 confirmations) don't be listed. So balance ...