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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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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1answer
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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1answer
47 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
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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1answer
326 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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75 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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1answer
188 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
150 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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1answer
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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1answer
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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1answer
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
108 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 ...
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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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2answers
208 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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1answer
394 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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3answers
351 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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2answers
961 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
137 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
67 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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1answer
826 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 ...
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2answers
300 views

Why has this blockchain transaction not confirmed?

ea5ee0a3734356a71b2b39deafb656715bad42fb297497f7f694d4a7a0f6335c Is due to the fee being low 0.0001? or something else?
2
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0answers
35 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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279 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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1answer
332 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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3answers
576 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
159 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 ...
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1answer
217 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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1answer
231 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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109 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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34 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
140 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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134 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
596 views

What is the genesis block?

What is the genesis block? In which ways is it important or different from other blocks?
2
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1answer
74 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 ...
2
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1answer
305 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 Blockchain....
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2answers
153 views

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 ...
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69 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. ...
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1answer
309 views

What does it mean ERROR code=-28, message=Activating best chain?

I am using insight-api for get block chain information. When i am trying to start insight i am getting error "ERROR code=-28, message=Activating best chain..." . I saw this error first time,please ...
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Node Operators Reward [duplicate]

Why don't we implement a Node Operator reward program (in the core) or if such implementation ever existed what would be the overall (Downside,Cause for concern, etc) Why don't we use the Miner Fee ...
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180 views

Basic transaction validation rules, Node accept to pool policy

I am trying to collect all infromation about adding and verification transaction to Blockchain. Exist 2 types : add transaction to RawMemPool and add Transations included in block. Could any ...
10
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1answer
484 views

Is there some client like Bitcoin core, but which highly compresses the blockchain?

I have been using Bitcoin Core for some months. I need a fully fledged client as I want to help the Bitcoin network. But the blockchain is so huge. I'd love to see some other client, which highly ...
2
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45 views

What happens when Bitcoin's blockchain grows to 1 Terabyte in size? [duplicate]

If bitcoin is to succeed surely the blockchain design has to be redone. Are there any other cyrptocurrencies with a different blockchain design than bitcoin?
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1answer
139 views

Blockchain Application

I am currently doing a project that requires blockchain to be applied to other systems. I was wondering where I can easily download the blockchain database and which is the best way of understanding ...
2
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1answer
142 views

How to synchronize with the bitcoin blockchain via bitcoinJ

I'am writing my very first application using bitcoinJ api and I got a bit stuck. Maybe somebody can tell me what I am missing. My practice app wants to write a sample contract in the bitcoin ...
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1answer
143 views

Merging blockchains after algo change

I have a question for the community and im hoping a few informed individuals could get me some insight. When a cryptocoin changes algorithm (eg. scrypt to X11), how does one achieve the merging of ...
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1answer
64 views

Get blockchain info for exchange transaction

I'm sorry in advanced if this questions are dumb but here goes ... Does all buy/sell bitcoin related transactions made in exchanges get logged in the blockchain? if so can they be found and/or ...
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232 views

Can a smart mind explain block difficulty calculation in lay terms?

I tried to read it here: https://en.bitcoin.it/wiki/Difficulty But it is closer to a rigorous math proof than to an explanation. I am interested to understand that so I can understand what makes a ...
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2answers
203 views

How can a block be considered more difficult to solve/hash than another one?

In this answer: http://bitcoin.stackexchange.com/a/760/28219 It is said: Because of all this work, when a Bitcoin client signs on to the network it can trust the block chain that was most ...