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'!

learn more… | top users | synonyms (1)

2
votes
3answers
13 views

A Wallet for many blockchains (not just the bitcoin blockchain)

In terms of the future of the trust network where there will be an increasing number of fit-for-purpose blockchains such as ones for proof of asset, proof of identity, proof of ownership etc., will ...
0
votes
0answers
18 views

blockchain wallet dont work

i can not see my balance and history of transaction http://prntscr.com/b8mgoy also i cannot send any amount http://prntscr.com/b8mgy2 I have received a lot of transaction since yesterday on generated ...
2
votes
1answer
95 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 ...
0
votes
1answer
252 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 ...
3
votes
1answer
26 views

Would moving a transaction from an old block to a new one allow more pruning?

At Pruning the branches in Merkle Tree Nick ODell writes "A leaf (transaction) can be pruned when all of its outputs have been spent." So I was thinking that if a transaction is one of the last few in ...
3
votes
2answers
58 views

Double Spending before confirmation

What's to prevent someone from using bitcoin at a store like subway and double spending to buy the sandwich before a confirmation is made? Since subway obviously isn't going to wait for a ...
4
votes
4answers
1k views

how can I insert an arbitrary sha256 hash into the blockchain?

If I want to prove that I wrote a particular document before a certain point in time, it would be sufficient to generate the sha256 hash of the document and somehow arrange for that hash to appear in ...
2
votes
1answer
145 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 ...
3
votes
1answer
23 views

Can you search a transaction by quantity?

I have been looking and I cant figure out a way to find a recent transaction by quantity. Let's say I know someone sent "x" amount of BTC but I don't know who was the sender nor the receiver, this ...
9
votes
1answer
130 views

Legal status of Blockchain proof-of-existence TX (USA court)

Is there any real USA court cases with Bitcoin's Blockchain used as an proof-of-existence/timestamp service (without BTC transfer)? Can Bitcoin's Blockchain be used as a 'signing' utility same as ...
3
votes
1answer
55 views

Would this scheme allow faster verification of transactions? (Multiple parallel block chains)

One issue with one block chain is that it needs to be globally synchronized. One way to elevate this would be to use multiblock chains. Namely, we can imagine that there are N block chains, working ...
0
votes
2answers
22 views

hash versus hash pointer

I am doing coursera online course on Bitcoin and Cryptocurrency Technologies. It defines the concept of hash pointer in the first lecture as pointer to where some information is store and ...
4
votes
2answers
479 views

All Bitcoin Public Keys with non-zero balance

I want to get a database or otherwise retrieve a set off all bitcoin public keys (not addresses) that have non zero balances. What would be the easiest way to do that? Is there an API that could do ...
1
vote
2answers
87 views

Size of the blockchain after pruning

What is the size of the blockchain stored on a user harddrive after pruning has occurred?
2
votes
1answer
254 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 ...
2
votes
3answers
59 views

How to store transactional information on the blockchain

I have an operational process that involves several sub processes. I am currently maintaining an audit trail of the entire process. For (successfully) completed processes, I want to record the ...
-1
votes
1answer
454 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 ...
1
vote
1answer
34 views
0
votes
2answers
20 views

what about that the adress change all the time??

if the aadress has changed in my wallet could I still receive funds on the old one?? becuase the adress has changed a lot of times by its own without I have change it
0
votes
0answers
22 views

Need help to understand where bitcoin transaction has gone

I am new with bitcoin and I need some help from experienced members. I have a server with bitcoin core where we accept some payments and use bitcoin core as mercant. The problem is that we have got ...
1
vote
1answer
76 views

Why are banks and other centralized entities interested in block chains?

Apparently banks and other centrialized entities are interested in block chain technology. My question is, why? The whole point of block chains is for decentralized, trustless, consensus. Bitcoin, ...
1
vote
1answer
57 views

Why the total number of bitcoin is limited?

Why the total number of bitcoin is limited? Is there a protocol in the block or somewhere so that the participants can't violate the rule? The first one who find the block can receive the bitcoin for ...
0
votes
1answer
40 views

Double Spend Attack

What's to prevent someone from sending bitcoins back to themselves using the same transaction id before any confirmations? So if I go into a deli and pay with Bitcoin and send those bitcoins back to ...
0
votes
1answer
53 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 ...
0
votes
0answers
53 views

Which language should be used for developing new Coin Source code?

I'm new to bit coin system. And I need to List my new Coin in C-CEX exchange and the Exchange asked to provide the Source code. And if need to develop the source code, which language is suitable for ...
1
vote
1answer
65 views

What can I do with Bitcoin Core to see my current balance?

I've waited 4 days now for Bitcoin Core v0.12.0 to synchronise the network and its getting really frustrating, especially when I still have 2 years and 38 weeks worth of the blockchain to download. ...
2
votes
1answer
83 views

What happens when an attacker completely controlls your Internet connection?

Bitcoin assumes that everybody sees the same ledger. However, what if your ISP is evil, and modifies your view of the Bitcoin network? Is it possible for such an evil ISP to make your own transactions ...
1
vote
2answers
43 views

Is there any bitcoin fork which goal is storing arbitrary information?

I know that there is Namecoin, which saves key:value pair. Is thete other similar solutions? Maybe for arbitrary textblocks? Update: how they do it? Delaware Blockchain Initiative to Streamline ...
0
votes
0answers
166 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 ...
-1
votes
0answers
28 views

Has there been an investigation into “proof of skill”

There are basically two kinds of proofs used to secure blockchains of various currencies: Proof of Work: Proof that a simple but expensive computation has been done. As long as at least 51% of ...
0
votes
2answers
53 views

How does each miner know when to create a block?

I have been trying to understand the protocol and reading related documents, there is a point where i get stuck. As far as i understand (correct me if not), when a transaction occurs, it is ...
0
votes
1answer
75 views

Restrict the Bitcoin usage only during a particular period

I would like to know if its possible to use a Bitcoin at present in the following scenario. When I send a Bitcoin to an another user,I set certain parameters on the Bitcoin, like it can only be used ...
0
votes
1answer
95 views

Bitcoin gone with “this transaction is not yet conformed”

I sent my bitcoins from my multibit wallet, first I did a a test spend which came across and then I sent all my coins. The transaction got a triangle icon and the text "this transaction is not yet ...
3
votes
1answer
745 views

Blockchain over 36GB and causing disk space issues

I want to install the bitcoind daemon on a computer with relatively little free space (about 35GB available). I thought that the blockchain was some 20 GB in size and figured that would be no problem, ...
2
votes
1answer
2k views

safely delete the blockchain from .bitcoin directory

I have bitcoind installed and I'd like to free up space by deleting the blockchain from my .bitcoin directory. What set of files and directories should I delete such that the next time I start ...
0
votes
1answer
90 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 ...
0
votes
3answers
104 views

I want to start mining new blockchain (exactly as Satoshi did in 2009) for testing purpose

I will mine myself ONLY so difficulty will be always in 1 range so CPU is enough for this task So my question is: how to setup bitcoin core 0.12 to start mining with CPU new blockchain ? If I type ...
4
votes
1answer
90 views

What metadata can be captured by a single miner? What about a group of miners?

It is my understanding that the blockchain consist of the following information for every transaction in the network: From address To address Amount of bitcoins What additional information can a ...
4
votes
2answers
127 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 ...
5
votes
3answers
16k views

What is a bitcoin tumbler?

I have recently heard of a bitcoin theft where the thief used a bitcoin tumbling service in an (apparently unsuccessful) attempt to cover their tracks. From this event I have several related ...
8
votes
6answers
3k 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 ...
1
vote
3answers
83 views

Who decides that the new block is ready to hash?

I know that new blocks are relayed one block per 10 minutes but that time is not exact but average so: Who decides that the new block is ready to hash?
0
votes
2answers
45 views

Is blockchain necessary?

I am interested in developing a crypto-currency (who isn't), but I have no interest in the blockchain mining aspect of it. I want to program one that emits the coins when someone has performed some ...
-1
votes
2answers
178 views

Technical Review of Bitcoin

I am currently looking on how does Bitcoin work, and I would like to sum things up with your help. The point is, if I ever want to write my own mining agent, what do I have to understand in order to ...
0
votes
1answer
763 views

Uses of computing power by bitcoin miners

How much of what this article says is true? I thought I had read that bitcoin miners are the ones who maintain the blockchain. Do they also do something other than maintaining the blockchain? In ...
0
votes
1answer
283 views

Repeatedly sending coins from an address to itself

Let's say I create an address that has a balance of x bitcoins, where x is the minimum transaction amount before prompting a fee. Hypothetically this address is used as a permanent cryptographically ...
1
vote
2answers
7k views

How do I use the blockchain file bootstrap.dat?

Once I have the 9+ Gb bootstrap.dat file downloaded, how do I use it? I'd like to attempt mining without joining a pool; do I have the right file for a solo effort? I can use Windows or Linux so ...
1
vote
1answer
23 views

How to apply RBF (Replace-by-Fee)

I got a stuck transaction and would like to clear this. I found many information about RBF (Replace-by-Fee) how it works etc. So i think this might be the best option to get my transaction going. ...
0
votes
1answer
41 views

How to determine the last 1k blocks and their Miner Software?

Basically the idea was to create a tiny service such as nodecounter.com. Now I would appreciate your help on the following questions: How to determine the Software (Core, Classic, XT, etc.) and ...
19
votes
9answers
8k views

How to check if the block chain is up to date using bitcoind or json-rpc?

I read the full api method list and did not seem to find one. I suppose there is no command specifically for that purpose, so what is the general way of doing this? I would consider checking the ...