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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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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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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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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71 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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35 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 ...
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132 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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132 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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200 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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135 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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103 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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67 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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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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27 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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44 views

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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107 views

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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43 views

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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153 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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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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117 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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107 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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210 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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249 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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136 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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90 views

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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102 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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34 views

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 ...
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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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167 views

What is the point of downloading the blockchain?

I have Bitcoin-core on my mac, and currently it is syncing. But what exactly is the point of having the entire blockchain downloaded onto your computer? Is it only there so that you can have an ...
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286 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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Ledger wallet transactions missing from blockchain

I purchased a Ledger wallet and have used it for four transactions: three in and one out. The first two transactions (one in and one out for the same amount) are appearing on my Ledger wallet ...
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161 views

Bitcoin offline transaction

Consider the following scenario: create an entire bitcoin raw transaction while offline (no access to the blockchain) only when you decided to broadcast it that you would need to get online ...
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124 views

Recommended resources or tuts for Bitcoin/Bitcoin Exchange clone using Ruby/Rails?

Are there any reputable resources or tuts for re-building a Bitcoin/Bitcoin Exchange clone using Ruby/Rails (e.g. Michael Hartl tutorial)? I would like to experiment and learn more about blockchain ...
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32 views

Why would a Tx's inputs not be assumed to be owned by a single service?

From question 3 in a project titled Blockchain: CSI (in what looks like a very cool class, run by University of Virginia!): Problem 3. The Heuristic 1 (Section 4.3) used to detemine sets of public ...
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77 views

How do deposit bitcoin works?

I visit so many faucets everyday and some gaming faucets like wonderlandcoin,playbitcoin,faucetbirds,robotcoingame and many more.I also visit some betting websites like satoshibet,777dice and many ...
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76 views

Why is this transaction stuck?

https://blockexplorer.com/tx/286fefb79f1b0a14526997e8c7bcb4bd7a5665c953586f6bbcd09e441b192d3f this is my transaction blockchain hash This is first time I've actually seen something like this - the ...
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2answers
102 views

How should one manage the Bitcoin blockchain on a Linux laptop with limited storage?

I want to run Bitcoin-Qt on a laptop that has limited storage (it has an SSD and is used for many purposes that all require a bit of hard drive space). Assuming these hardware limitations, what would ...
2
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1answer
107 views

In what scenarios can the blockchain size decrease for bitcoin?

I am running a private bitcoin network for which I changed the target time between two blocks to 12 seconds and the difficulty adjustment to 25 blocks interval. I ran the network for about 4 hours ...
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188 views

Can a blockchain be created that forgets transactions whose outputs have been spent?

Is it possible for a blockchain based currency to say, after all outputs have been spent from a transaction to "delete" it from the blockchain, or at least require the nodes not to download it, what ...
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382 views

Why can't bitcoin miners modify transaction outputs?

I am learning the Bitcoin protocol by reading the bitcoin developer reference documentation. As far as I know, a raw transaction consists of: Version (which is always 1) Inputs. Each input contains:...
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349 views

Can a Bitcoin block be less than 1mb?

Can a Bitcoin block be less than 1mb? To my understanding, a miner receives broadcasts. However, if not enough transactions come in, then would it just prematurely hash the block?
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How many blocks are there in blockchain as of today?

I have currently downloaded 300,000 blocks and the last one is generated 1 year and 19 weeks ago. I wonder how many blocks are more to go, before I am up to date.