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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22 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
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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 ...
0
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2answers
20 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 ...
3
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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 ...
1
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1answer
34 views

How to check if my node is fully sync'ed

Using bitcoin-cli, how do I check how sync'ed my full node is?
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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
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0answers
21 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 ...
2
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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
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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
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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 ...
1
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1answer
73 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, ...
0
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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 ...
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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 ...
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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 ...
3
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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
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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
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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 ...
9
votes
1answer
126 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 ...
0
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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 ...
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3answers
82 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?
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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
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. ...
1
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1answer
29 views

Height mismatch between bitcoin-qt and bitcoin explorers

I am running bitcoin-qt on the testnet. The count of the last block is 787794 which is way ahead of what I see on blockchain explorers such as https://test.webbtc.com/, which shows the last block as ...
1
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1answer
60 views

Bitcoin boom and bust - Inherent instability of Bitcoin

I'd like to put the a question to the community regarding the inherent stability/instability of Bitcoin. I hope it's not off-topic since it's more a economics-type question. So, here's the scenario in ...
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0answers
25 views

Finding forks in the blockchain

I would like to analyze forks happened until now in the blockchain, is there any kind of script or suggestion to view that(not the blockchain.info chart)
0
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1answer
40 views

Is the merkle root random? (Crytographically secure?)

If I look at a block 000000000000000004f0cc322f551e39676f781186441614da3281bbc7d373e0 I can see the value of the merkel root: 9fe31d0d9d06d9da341a3ee757c57bb29af522796d5d9efa5efded8cda1684a4 Which ...
0
votes
1answer
18 views

How to find values of Prev_Hash and Tx_Root

http://bitcoin.stackexchange.com/a/13347/27951 Based upon the answer here, it seems there's values per block with each Prev_Hash and also Tx_Root There doesn't seem to be much documentation for how ...
0
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1answer
47 views

one time pad using blockchain

I am thinking if secure encryption like one time pad (OTP) is achievable using bitcoin blockchain? The reason is bitcoin blockchain size is over 70 GB, which could potentially encrypt/decrypt 70 GB ...
1
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1answer
64 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. ...
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2answers
54 views

Empirical analysis of blockchain branches: once every 380 blocks?

I've completed an empirical analysis of blockchain forks from block #300000 thru #400000. I found the following: (a) blockchain forks of length 1: observed every 380 blocks on average; (b) blockchain ...
2
votes
1answer
81 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 ...
0
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2answers
61 views

How do I remove hard coded seeds from the bitcoin source code?

I'm experimenting with blockchains at home and in my debug logs are lots of errors showing that my nodes are trying to get addresses from the hard coded seed nodes, I know I can use connect to turn ...
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2answers
48 views

Bitcoin adress security questions

I am trying to understand Bitcoin addresses, but it does not seem to be easy at all. As far as I know, a transaction uses one or more addresses as input and one or more addresses as output. Is this ...
4
votes
2answers
116 views

Where did the idea of blockchain come from? Git was already using it since 2005

With bitcoin's blockchain, each block's hash is computed with the previous block's hash. That makes all blocks an immutable chain. This is not the first time people used a hash-chain. As far as I ...
3
votes
1answer
46 views

Where can I find records of blockchain branches?

I plan to analyze blockchain branches to satisfy my own curiosity: how often do they occur, are they increasing in frequency, etc. To clarify my earlier mistaken terminology: I am talking about ...
1
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1answer
42 views

Where can I find a record of blockchain soft forks?

I plan to analyze soft forks to satisfy my own curiosity: how often do they occur, are they increasing in frequency, etc. Where can I find a record of blockchain soft forks? I'd love to find a handy ...
0
votes
1answer
86 views

Blockchain.info send may transactions API v2

I'm currently using v2 of Blockchain.info's API and am wanting to utilise "Send Many Transaction" and am having some issues. I have 1 wallet with many addresses, I am trying to send 2 transactions ...
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0answers
23 views

Verification progress decreasing when validating genesis block

I've been experimenting with the litecoin source and have decided to make my own token network for personal use. I've mined my own genesis block, and assigned unique identifiers for base58Prefix and ...
0
votes
1answer
82 views

blockchain size issue

I am running full bitcoin node locally. Currently, the size of the blockchain is around 70 GB. Blockchain size Further, I stored all the blocks in a text file in json format. It turned out that the ...
2
votes
1answer
46 views

What is 'spendability of coinbase transaction after 100 blocks' in Mastering Bitcoin referring to?

Ch7 of the book writes at the end of the Introduction section: "After 100 blocks back there is so much stability that the coinbase transaction—the transaction containing newly mined bitcoins—can ...
0
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1answer
32 views

When I pay, how is my balance checked, if I use different address every time?

I know there are quite similar questions, but none have addressed my issue. Let's say I use Electrum wallet, that generates addresses & keypairs from seed. So for every next transaction I use ...
2
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0answers
35 views

Bitcoin / blockchain security proof

Has there been any research papers where someone has completed a full security proof model on blockchain / bitcoin ?
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1answer
50 views

Blockchain research

I am doing research on block chain malleability and I want to build my own blockchain prototype / testbed in order to practically see the malleability issues in blockchaining mechanism (like bitcoin). ...
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0answers
92 views

Simple version of blockchain? Blockchain for training

Please tell me whether there is a simple/lighter version of blockchain, you can install and learn "at home"? Link? Which implementation blockchain better learning?
0
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1answer
57 views

Server requirements & optimal configuration for Testnet

My friend and I are interested in running some experiments using a blockchain and accordingly we're interested in setting up our own Testnet. We're a bit light on experience, i.e. we've never set up ...
0
votes
1answer
94 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 ...
0
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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 ...
0
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2answers
58 views

Building a web app to collect Bitcoin payments. How should I monitor transactions on payment?

I'm looking to create a web app similar to coffee.foldapp.com where they load up a bitcoin address and once you pay it will automatically show the Digital code product. They seem to be using ...
0
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0answers
31 views

How can I automate bitcoin sending?

I need a wallet which supports the ability to send payments to other wallets through some sort of rest API / URL's, anyone got any info? Thanks!
2
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1answer
168 views

Why change the nonce instead of just rehashing?

Why do miners increase the nonce to compute a block hash rather than just generating a random block hash? It seems to me that both approaches would have the same likeliness of finding a result that ...