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 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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384 views

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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112 views

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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2answers
107 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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30 views

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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1answer
95 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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100 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
177 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
244 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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2answers
131 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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85 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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98 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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54 views

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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44 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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1answer
160 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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1answer
255 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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72 views

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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134 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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1answer
116 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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76 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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1answer
71 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
99 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
105 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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2answers
174 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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366 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 ...
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346 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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695 views

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.
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1answer
117 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 ...
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1answer
59 views

What's the maximum possible utxo growth rate now? Can that be turned into an attack?

Now bitcoin unspent transaction output growth rate (not total size) can be, 260k utxo/day (3×60×60×24). With 8MB blocks, that's 2.8 million. Single 1 bitcoin output can be split into 1000 x 1 mBTC ...
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790 views

Why do you need the *complete* blockchain to mine bitcoins, why not just the last n blocks?

I understand that to mine bitcoins you need the hash of the previous block, and in order to resolve possible forks. But why not just have the last 100 blocks (or more whatever is appropriate) and keep ...
2
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2answers
245 views

Why has this blockchain transaction not confirmed?

ea5ee0a3734356a71b2b39deafb656715bad42fb297497f7f694d4a7a0f6335c Is due to the fee being low 0.0001? or something else?
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33 views

Differences between MemoryBlockStore and SPVBlockStore

What are differences between MemoryBlockStore and SPVBlockStore in bitcoinj? Which should be used for downloading the blockchain and why? Can I use same SPVChain format file for all wallets?
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34 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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3answers
223 views

Why is sharding not possible with a distributed blockchain?

Hi guys I've been reading a lot about the problem of scalability in crytocurrencies and how to run a full bitcoin node is not a possibility on a mobile device for example, as a result we become ...
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293 views

Picture of blockchain

Can anyone point me to the picture I saw somewhere but can not find it anymore where blockchain is represented as a line of blocks chained together. There was a locker on each little block, and each ...
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546 views

Selling copies of blockchain database on disc

Is it ethical / legal / at all possible to burn a copy of the Bitcoin (or any cryptocurrency) blockchain to a disc, and then sell the disc? Would there be any additional issues if we included a copy ...
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1answer
150 views

How smart property works on basic bitcoin blockchain?

How smart property works on basic bitcoin blockchain? I am not sure that how to make token, that is tied with a particular object, on the bitcoin blockchain. I've already know I can use such kind of ...
2
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1answer
197 views

How do I retrieve the funds on my Core wallet when I can't synchronize the blockchain?

I have about $200 in bitcoin but my wallet (Core) won't synchronize the blockchain (it's been doing this for days) since for some reason it got corrupted (As it tends to do say every other month) and ...
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187 views

A conflicting transaction has been detected in our memory pool. The transaction hash displayed below may change

SO i received this transaction from my other wallet 1) https://blockchain.info/tx/06810d392213a7453bbe6ad4ab95c0892875b0db2b56b3db5ef942b0a42eced4 for 1.02BTC and sent these for 1btc and 0.2btc ...
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57 views

Given the latency and hash rate for a mining pool, is it possible to determine the expected number of accepted blocks? [closed]

Assuming there is only one node to communicate to, can we determine how many blocks mined by a pool will be actually accepted into the block chain?
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102 views

bitcoin api blockchain - where is the money?

I have made several transactions via blockchain API, and I'm getting the callback everything works normally. But today when I see my balance is zero and it has no transaction history. Transactions ...
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32 views

Is it possible to search for an transaction to or from an address with a time period filter?

How can I search for a transaction to or from a certain address in the block chain within a particular time period? I am trying to answer if this transaction occurred on 17 Oct 2014. Hence, instead ...
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2answers
129 views

Could Blockchain be used for a different currency, leaving bitcoin behind?

I’ve seen articles lately that many large banks including, HSBC, Deutsche Bank, Citigroup, and Bank of America are exploring the use of Blockchain. Knowing these banks, they would surely love to use ...
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116 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 ...
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2answers
508 views

What is the genesis block?

What is the genesis block? In which ways is it important or different from other blocks?
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1answer
69 views

Where can I find the structure and layout of what exactly gets hashed by miners?

I understand that a miner has a list of bitcoin transactions since the last time a a block was discovered. The first entry is the reward for who discovered the previous block. As more transactions ...
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1answer
249 views

Export Private Keys from Bitcoin-QT

I am still attempting to complete the receipt of a payment in BitCoin-QT. The initial synchronization is beginning to be a hassle so I thought I might get my key and transfer my wallet to ...
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Wouldn't bitcoin benefit from distributing partial blockchains over each node?

Why doesn't each node store only a portion of the blockchain? For example, if you had 100 nodes, each node would store 10% of the blockchain. This would amount to significant overlap of each aspect ...