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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How would an atomic exchange of assets be implemented in a blockchain?

There are non-Bitcoin blockchains being created at the moment that are used to trade and transfer assets. It is my understanding that on such a block chain there are "tokens" representing assets such ...
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45 views

Security within a deleting blockchain model

Assume a blockchain model that contained no transaction data - just pure data. After a set time this data would simply be deleted, and entire blocks would be removed. How would the security model of ...
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213 views

Who is the certification authority in Bitcoin?

If you would compare Bitcoin with electronic banking there are quite a lot of similarities like the encryption and hashing with private and public keys. In electronic banking though the bank is the ...
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58 views

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 ...
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20 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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117 views

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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260 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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229 views

How long do files stay on the Decentralized Data Storage blockchain when using NXT's Data Cloud Feature?

NXT 1.7.4 just released a new Data Cloud feature: How long do files last on the NXT blockchain?
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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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63 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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145 views

Size of the blockchain after pruning

What is the size of the blockchain stored on a user harddrive after pruning has occurred?
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132 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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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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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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73 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 I'...
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69 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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65 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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313 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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76 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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39 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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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 ...
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166 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 co-...
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138 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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202 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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162 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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114 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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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 ...
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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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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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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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46 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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28 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, ...
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How out of block chain transactions work, and is there any API for that?

i wonder how out of block chain transactions work, because till i know it happens but "is not recommended" (it is what i read on the internet), i want to manage some micro transactions but as it is ...
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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 ...
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Bitcoins never showed up in wallet. Yet sender says transfer complete

I've used a site called bit trade australia to buy and send bitcoins to a wallet on blockchain.info. Successfully three times this month, trusted too. Yet this time (after receiving an email from ...
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Is it cheaper to store data across multiple instances of the same contract?

From what I understand, code is deduplicated on the Ethereum blockchain by storing pointers in new blocks to blocks containing code that is being reused in the new block. If that's the case: Is it ...
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168 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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What would happen if there are more blockchain imitators like Factom?

I was referring to this question. Apparently Factom creates its own "chain" for timestamping purposes, "hashes" the entries, and then stores these hashes on the blockchain, to create an unalterable ...
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blockchain.info php api

Hello I am new to this block chain environment,but i am currently working on project which requires blockchain.info api(php),so could anybody please tell me how to use this api in order to send data ...
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111 views

Can I see a transaction sent to me if I haven't downloaded the whole blockchain?

Last received block was 12 weeks ago, and I'm still syncing. I have moved some bitcoins to this wallet from another, but I still can't see it in my inbox after a day. Is it because I don't have all ...
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genesis block creation stalled

I am not familiar with ethereum and I am trying to generate the genesis block. So I ran this : python mk_genesis_block.py --extradata ...
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124 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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114 views

Wallet didn't include fee, transaction stuck on unconfirmed

My wallet has always automatically included a transaction fee everytime I do a transaction, but this time it didn't and I dont know why. I did everything like I always do and I haven't changed ...
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1answer
264 views

What exactly is the input for the Hash pointer in block k+1?

I'm not sure how to ask this question clearly so I will ask it three different ways and hopefully someone understands me. Is the input for the hash pointer in block k+1 just the transactions in ...
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3answers
253 views

Ethereum - contract

I'm not sure whether people answers question on Ethereum here as well but just in case... Once my smart contract is active on the Ethereum, what prevents me from modifying the contract for my own ...
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139 views

If Blockchain miners weren't paid would there still be trust in all bitcoin transactions?

If Blockchain miners weren't paid to mine would there still be trust in all bitcoin transactions?
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How much out of order are the blocks stored in the blk*.dat files?

To be more exact: Given two blocks A and B, with heights A < B, but with positions in the blk file (we'll call them pA and pB) pA > pB. What is the maximum amount of blocks that there could be ...
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103 views

why is the blockchain necessary if bitcoins utilize cryptography

Mainly I am proposing the idea below because I feel that the blockchain is overkill, but I assume I must be missing something. So if someone could pick out the flaw below, I would greatly appreciate ...
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What block version is this: d9b4bef9 (decimal: 3652501241)?

I'm trying to parse the blockchain directly from the .dat files. The parser works well up until I run into these blocks, with the version appearing as "d9b4bef9" (already reversed). What is this ...
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Why pose limit on update ratio of network difficulty [duplicate]

The Developer Guide on Bitcoin.org says: If it took fewer than two weeks to generate the 2,016 blocks, the expected difficulty value is increased proportionally (by as much as 300%) so that the ...