The blockchain is a list of all transactions that have occurred using the Bitcoin currency. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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storing bitcoin's database directory on an external drive?

I have a new-ish powerful laptop with SSD, limited to 128GB. It came with a RAID which somehow didn't work for installing linux, so I had to disable the RAID and now I have actually two 64GB disks ...
2
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1answer
240 views

Where can I direct download the NXT blockchain data instead of from the client?

When installing the nxt nrs client from scratch I need to redownload the nxt_db database blockchain. Is there a place where I can just download it from directly on a fast connection? It seems that it ...
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4answers
2k views

Creating my own bootstrap.dat?

Since I have been tearing down and setting up bitcoin clients a lot for some experiments lately, I was wondering whether there is a simple way to speed up the synchronization with the network. One ...
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5answers
801 views

How to store data on the blockchain?

I am wondering if it is possible to give someone a bitcoin transaction ID and with that he can read some hidden data, like the blockchain.info notes on transactions, but for real, stored in the ...
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10 views

What blockchain (or similar technologies) allow for “splitting” the network, offline?

There were a few ideas on how to make the blockchain hierarchical, and also splitting it to allow for splits. Are there any proposed/non implemented ideas that accomplish this with Bitcoin or any ...
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3answers
44 views

how do nodes verify that a block has been solved and can be added to the blockchain

when a miner solves a block it gets sent out to the network, when other nodes receive it, how do they verify that the block received was indeed solved and can be added to the blockchain. So you don't ...
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1answer
41 views

How can I manually add a receiving address in MultiBit Classic Wallet - disconnected during confirmation

Open to any suggestions... (Original Question is below and am trying advice from the first answer) I am in the process of looking at all the deleted files on the USB disk where MultiBit resides using ...
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5answers
11k views

What is the Merkle root?

The Bitcoin wiki Vocabulary article explains why the Merkle root exists: Every transaction has a hash associated with it. In a block, all of the transaction hashes in the block are themselves ...
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2answers
98 views

Valid fork in regtest - Change blockchain via RPC?

I've created a regtest network consisting of 2 nodes - node0 & node1. I'd like to have a fork on the common blockchain and seemingly achieved it by doing so: nodes start node0 adds node1 via ...
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1answer
34 views

Bitcoin-QT issues with non standard filesystem

I'm having issues with blockchain catchup that I believe to be related to the underlying file system. Symptoms: Significantly behind the network, start client and begin catchup. Catchup proceeds for ...
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2answers
59 views

How to run a full node: Am I already doing so?

I ´ve succesfully installed bitcoind and bitcoin-cli. I got some questions about it: I run bitcoind in the background by typing: bitcoind -daemon and block chain begins to download: by typing ...
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2answers
108 views

Can a hard fork effectively double the value held in bitcoin?

A hard fork necessarily means that two versions of the block-chain exist and value is held in both. Now realistically one of them should probably go down in value and the other increase or hold steady ...
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108 views
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Bitcoin core stopped sync'ing (without downloading all the data). How can I make it resume the synchronization?

I really need your expertise guys. I am extremely new to this concept but just decided to try. Unfortunately I did not do my homework before playing with my money. I bought some coins and I sent them ...
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3answers
20k views

Can someone explain how the Bitcoin Blockchain works?

I'm trying to figure out how the blockchain works and how to read it via blockchain.info website. Is there a laymen way of explaining how the block chain works and how to read the blockchain to trace ...
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2answers
784 views

Is there a (potential) “Blockchain size problem”, and what solutions are available?

As more and more Bitcoin transactions are produced, the growth of the Blockchain may well, one day, become a problem for systems which want (need?) to store the whole blockchain. Storage usage ...
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1answer
169 views

Please help! How do I transfer my wallet from bitcoin core to MultibitHD?

I (should by now) have bitcoins in my wallet,I sent them to my wallet whilst i was using bitcoin core but after taking days to sync (and it still hasn't synced) i have given up and installed ...
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1answer
105 views

Why does Bitcoin-QT not seem to be catching up on my Mac?

I've had Bitcoin-QT running for about six total hours, and the rate at which it's catching up is glacial at best. It takes about an hour to advance a week, which would make the process take about 4 ...
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0answers
23 views

writing blockchain explorer, handling sidechains and block reorg

I've got stuck with problem how to handle sidechains. E.g. we are on the longest chain, all transactions have been parsed (we mark outputs as spent, manage addresses total receive, total spent), we ...
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31 views

blockchain transactions dump file

I am looking for hourly, daily, weekly, monthly and yearly blockchain transactions dump in csv or other formats. Any pointers would be really appreciated.
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19 views

Size of the blockchain after pruning

what is the size of the blockchain stored on a user harddrive after pruning has occured ? Thanks
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2answers
72 views

Is it feasible to use the Blockchain technology without the Bitcoin?

Every once and a while, I step into some article like this one: Forget Bitcoin -- What Is the Blockchain and Why Should You Care?. I've been hearing a lot of blabbering about companies to begin using ...
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1answer
95 views

Unconfirmed/pending transaction in MultiBit no longer exists, but my coin is still gone!

Last night, I transferred some coin to my MultiBit local wallet, which worked fine. Then I tried sending some to another wallet, and the transaction showed up as "unconfirmed/pending" after taking my ...
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1answer
23 views

Funds still showing in old Armory wallet/address after being sent+confirmed to new Electrum one?

I'm having a bit of an issue that I'm sure someone more knowledgeable will be able to clarify. I've had an old wallet using the full node client "Armory" for a few years, with 0.2 BTC within that ...
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2answers
433 views

Bitcoind server strategy. How much disk space?

I need to host a Bitcoind on a VPS. My main issue is the disk space strategy. I don't know the amount of MB the blockchain adds per day or per month. On my disk I have 26GB of disk spent for the ...
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2answers
102 views

How to reward mining in a blockchain that doesn't store currency?

I understand the bitcoin blockchain motivates mining because there's a bitcoin reward for the miner who solves the pending block. What if a blockchain doesn't store currency data but some sort of ...
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2answers
58 views

Will Confidential Transactions allow us to reuse addresses safely?

It is often said that, due to the natural transparency of the blockchain, one should have a multi-address wallet and try to not reuse addresses, so that the user's transactions are not so easily ...
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52 views

Anonymous Buying/Selling

If one person sold bitcoins to another person using a smartphone, will a record of the IP addresses of the devices they used be seen in the blockchain?
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4answers
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Can someone explain to me how do you read the blockchain.info transaction data?

Ok so i've been using bitcoin for some time now, but i never figured out how to read the blockchain.info transaction data. Here's a sample of what I mean: http://prntscr.com/2dj7tr --- ...
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1answer
25 views

I try to run username crawler of twister core

I am trying to run usernameCrawler.py file of twister-core. I have taken the following steps: I have built twister I used this command to run twister: ./twisterd -rpcuser=user -rpcpassword=pwd ...
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0answers
32 views

Blockchain.info forgotten password, Download encrypted wallet using identifier?

Good day. I have an old Bitcoin wallet with 0.14 in, I only wrote down the identifier when I created it. I am pretty sure the password contains part of my generic password I use for most websites. So ...
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1answer
36 views

Blockchain Tools for Voting Among Small Groups?

I am considering starting a new co-op based business. Since the business will be member-owned, it would be nice to launch the business with a voting tool. I want to be able to propose items to the ...
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1answer
59 views

How do I build bitcoin transactions graph?

I'm using blockchain dumps from http://dumps.webbtc.com/ in database schema in mentioned that result of script in pk_script should specify recipient of transaction. But how do I get amount of bitcoin ...
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1answer
20 views

Multiple wallets on one browser

I have several wallets on blockchain.info My problem is that when I log in to my wallet the id of one of the wallets appears automatically and I can't type the data in of the other wallets. How can ...
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1answer
22 views

Understanding skip pointers in BlockIndex in bitcoin sources

From source code: /** The block chain is a tree shaped structure starting with the * genesis block at the root, with each block potentially having multiple * candidates to be the next block. A ...
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1answer
556 views

How do I fully uninstall the Bitcoin Wallet app for Android?

My phone is rooted and I'm not going to use the Bitcoin Wallet app anymore since I'll be switching to another one. My problem is, I can't seem to find where the downloaded blockchains are stored. If ...
5
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1answer
26 views

Is it possible to determine the total amount of timelocked Bitcoin?

Now that is possible to lock funds until a certain date (https://coinb.in/#newTimeLocked). How to calculate how many of all bitcoin in existence is locked until a certain date? Any service that does ...
3
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1answer
73 views

List of blockchain explorer APIs?

I'm gathering a list of Bitcoin / Blockchain APIs. I mean web (REST) APIs that allow you to do basic blockchain queries through http(s) API calls, such as: getting the balance on an address, getting a ...
4
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1answer
140 views

WARNING: abnormally high number of blocks generated

I have this error from 5 days ago on my 2 servers WARNING: abnormally high number of blocks generated, 48 blocks received in the last 4 hours (24 expected) What is this error ? I need to ...
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0answers
31 views

Reset bitcoin blockchain checkpoint to mine 0th block [duplicate]

I want to start a new block chain and mine the 0th block, but I guess the hardcoded checkpoint in chainparams.cpp won't allow that. I guess I need to reset the checkpoint hardcoded as follows before ...
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2answers
61 views

How can the transaction history be checked when new addresses are generated?

When a new transaction is executed via a Bitcoin-client, the sender will have a different address than the ones used in previous transactions. I also know that all the full nodes in the Bitcoin ...
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0answers
33 views

What exactly does “Federated Servers” mean in blockchain space?

Does "Federated Servers" mean non blockchain model? P2P model? Server-Client model? no trustlessness?
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0answers
15 views

BTC transaction from core wallet 0 confirmations 5 hours [duplicate]

This is the first time that I have seen anything like this from my core wallet. I attempted to deposit to Bittrex and it has been pending now for over 5 hours with 0 confirmations. Is there anything ...
4
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2answers
442 views

“offline” blockchain querying library

Is there a library which provides all the same address/transaction querying information as blockchain.info, depending only on having a bitcoind synchronised database? There are a number of queries ...
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1answer
383 views

How to retrieve all addresses with non-zero balance and their balances?

I'm looking for a way to retrieve all address balances of addresses with a non-zero balance in the blockchain. Is there a software tool that can calculate the balances in an accessible format? Or ...
2
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1answer
44 views

If Bitcoin time value is 4 bytes, is that Unix time from 1970?

I assume that when January 19, 2038 rolls around, there will be a plan for extending the time to more than four bytes. or is it the case that the four bytes are not UNIX time, or do not begin in ...
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0answers
20 views

How to use MySQLFullPrunedBlockStore with bitcoinj-core-0.13-bundled.jar

Initailly i am using bitcoinj-core-0.12.2.jar and bitcoinj-tools-0.12.2.jar on my project.Now i updated it with bitcoinj-core-0.13-bundled.jar because i am assuming that bitcoinj-core-0.13-bundled is ...
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1answer
32 views

Syncing node to usb 3.0 drive taking ages

I'm trying to make a bitcoin app and would like to use a full node so I purchased a 128gb usb 3.0 drive to store it on. I use an early 2014 macbook air: 1.4 GHz Intel Core i5, 8 GB 1600 MHz DDR3. Is ...
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0answers
24 views

Retaining Ownership of an 'Approval' Indicator Coin

I want to use some form of crypto-currency/blockchain algorithm to represent the notion of "endorsement", in the sense of approval. One approach is to have a coin that you can give to a recipient, ...
2
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3answers
175 views

How does the blockchain work, explained in layman terms?

I did a lot of intensive research on how the Blockchain actually works. I understand the machinery but it's really difficult to explain this to a layman. Could someone provide the simplest of ...