1
vote
1answer
5 views

How does “headers first” effect BLKxxxx.dat structure?

Assuming a full node running Bitcoincore v0.10 (with txindex=1), how exactly does the new "headers first" functionality affect the structure of the blockchain data? (Specifically, the blkxxxx.dat ...
1
vote
1answer
6 views

Did Satoshi intend to allow midstate computation to speed up hashing?

The design of Bitcoin allows computers to compute a hash with 2 iterations of the SHA256 compression function instead of 3 on all but 1 out of every 2^32 attempts. When Satoshi chose SHA256d for ...
1
vote
0answers
8 views

List of companies that has Implemented their own cryptocurrency or Color Coins in their business?

Is there a list of companies that has implemented either their own crptocurrency or went with the color coins approach into their business? I'm particularly looking for non-mining related companies ...
0
votes
0answers
27 views

How I make exe for Bitcoin in Ubuntu?

I want to create a bitcoin wallet executable file in Ubuntu with all its depencencies. So when use that file from some other system it will work perfectly. How I can make a executable in ubuntu?
2
votes
1answer
23 views

Bitcoin transactions over Ripple Network

I am interested in using the ripple network in conjunction with bitcoin transactions, but am curious as to interplay between the ripple ledger verification and the bitcoin blockchain verification. I ...
0
votes
0answers
29 views

Is it legal to buy things internationally for Bitcoin from India?

I want to buy educational videos from someone in the USA, who offers them privately for sale as a digital download. He accepts Bitcoin. I'm purchasing them from India. Would it be legal for me to ...
1
vote
0answers
21 views

Problem with Berkeley DB while building Bitcoin on Windows from Source Code?

I'm trying to compile Bitcoin from source code in Windows 7. When I run ./configure, I get the following error: checking for Berkeley DB C++ headers... no configure: error: libdb_cxx headers missing ...
0
votes
1answer
17 views

What does it mean to “password protect” your wallet on Multibit?

Isn't my wallet (i.e. my private key) already private? What does it mean to set a password for it? I assumed it encrypted the wallet file, but this answer seems to point otherwise. How can they verify ...
3
votes
1answer
30 views

Why are Electrum 2.x mnemonic sentences thirteen words long?

The 2.x version of Electrum uses mnemonic sentences that are 13 words long. However, 1.x versions use a sentence only 12 words long. I realize that 2.x changed the derivation of key pairs ...
1
vote
0answers
17 views

Javascript Stratum Miner

I'm aware of some Javascript RPC Miners, but does anyone know of any Stratum Javascrip Miners for use in my website?
0
votes
1answer
22 views

What does 1 day PoW mean?

I see several coins advertising 1 day PoW. An example is this coin. https://github.com/concealcoin/concealcoin I have been studying the code but must be missing a critical part as none of the math ...
1
vote
2answers
29 views

How to find the Bitcoin addresses used to create a Multi Signature address

Assume we have a 2 of 3 multi signature address and we send some bitcoin to that address. Then we spend the funds from that address by signing and broadcasting a transaction. Just by looking at that ...
-1
votes
0answers
36 views

how to receive my awards? [on hold]

I'm solo mining with two ASIC miners at 150 GH/s. On a solo mining pool with cgminer with my address wallet in user. I've all the time shares accepted and New block detected because this pool would ...
1
vote
0answers
40 views

on testnet: 'transaction already in blockchain'.. but it isn't

At least I don't think so! I'm trying to create a wallet infrastructure to minimise fees, and so I've been experimenting with raw transactions. I'm quite clueless but fortunately have enough sense to ...
1
vote
0answers
16 views

Why is “New Account” grayed out in Electrum?

When creating my wallet, I chose the options "Create new wallet" and "Standard wallet." I think this is a BIP32-based wallet. As you can see in the screenshot below, "New Account" is grayed out. Why ...
1
vote
1answer
35 views

Check if a user pays another user for bitcoin website

I am creating a bitcoin website. I would rather the bitcoin didn't go through my website to prevent any security issues. What happens is one user pays another user, and when that happens my website ...
0
votes
2answers
24 views

merged mining nonce

when mining bitcoin, the nonce is included in the header, which is then hashed and checked to see if it is below the target threshold. and everybody can verify that the header does indeed hash below ...
2
votes
0answers
26 views

Working example of raw transaction utilising Boolean (OP_IF, OP_ENDIF) scripting REQUIRED

I recently posted this Testnet TX (TxID 2d0daa01da8294a54178f8111eb2a02010c425fd15957d8baee8717edcfbe105) which successfully spends an output (TxID ...
0
votes
2answers
16 views

What is a midstate? How does using a midstate speed up hashing?

This defines "midstate" as the "precomputed hash state after hashing the first half of the data." I've heard "midstate" used in the context of speeding up hashing. How does using a midstate speed up ...
0
votes
2answers
29 views

Can coin wallets create their own network/blockchain?

In other words, I want a coin with NO premine and NO mining. Can the wallet, alone, generate the coin(s) and the blockchain, based solely on inter-wallet communication (establishing a wallet ...
0
votes
1answer
26 views

Gridseed USB ASIC Won't Mine Bitcoins

Okay so I have done my research, I have practically tried everything. It just frustrates me because mining LTC was a piece of cake but I can't seem to figure out how to mine bitcoins which this device ...
0
votes
1answer
27 views

What is the benchmark that mining ASICs are measured with to determine the hash rates?

When a mining ASIC claims to run at 1 MH/s or 10/MH/s or even 1000 GH/s, at what difficulty and with what algorithm is that measured against? I bought a cheap scrypt ASIC to see if it would live up ...
0
votes
1answer
16 views

Unable to Compile Particle-Qt using qmake in Ubuntu 15.04

Good Day! I am trying to compile the Particle-Qt Client on Ubuntu 15.04 Vivid Velvet using GCC 5.0 & libboost1.55 So my system is throwing errors, these are the following: While executing ...
1
vote
1answer
19 views

Is disclosing an index used for generating BIP32 addresses insecure?

I'm writing an e-commerce system that uses BIP32 to generate addresses. I was thinking of using the order number (which is shown to the user) to as the index for generating the address to pay to. ...
-1
votes
0answers
14 views

If I am mining at 50Mh/s…? [duplicate]

I currently got into bitcoin mining. I do not need to pay electronic or internet bills as of I live with my parents. So losing money from electricity isn't a problem for me. I am just wondering how ...
4
votes
2answers
52 views

Is there a special name for the block currently at the head of the chain?

Just as we have the genesis block which is block 0, is there a special name for the block currently at the head of the chain? Obviously such a block would be observer dependent and never absolute but ...
0
votes
2answers
48 views

“block decode failed” error while mining in pool

I just started solo mining last month, and I have no problems with cgminer. I have already shares accepted and sometimes new block detected. I want to know why when I want decode I've an error? For ...
0
votes
0answers
34 views

Does anyone have a formula for dynamic block durations?

I want to implement this, so does anyone have a formula for dynamic block durations instead of a fixed target of 10 minutes?
0
votes
1answer
23 views

Does anyone have a formula for adaptive blocksize?

I want to implement this, so does anyone have a formula for adaptive blocksize? I only found this: if(average size of last 4096 blocks*4>maxblocksize && median size of last 4096 ...
0
votes
0answers
29 views

Altcoin peers do not sync with each other

I created two altcoin peers and they can add blocks to genesis block. However their blockchains do not sync with each other! The only way let the block merge is to stop a peer and restart the peer. ...
-2
votes
0answers
11 views

How do I put Altcoin's Genesis Reward into my account?

I created an altcoin recently. Although I set the "scriptPubKey" to my wallet's public address, I still cannot receive genesis's rewards. Do I miss anything?
0
votes
0answers
24 views

Where is the code for verification of multi signature?

I want to apply the multisig system to my own project. It's not hard to get the code for the client (or signing?), but where is the code for the verification process?
0
votes
0answers
39 views

Bitcoin core server error when requesting data

I'm trying to interact with the bitcoin network with Bitcoin Core server and the JSON RPC PHP library found on the wiki here: https://en.bitcoin.it/wiki/API_reference_%28JSON-RPC% My setup: I ...
0
votes
2answers
24 views

Why doesn't the block time influence time the amount of time needed for a transaction to be confirmed?

Litecoin has faster blocks, but needs more confirms. I understand this is because of possible reorgs, but how come it also needs 10 minutes for confirms even though the blocks are faster?
1
vote
1answer
44 views

Blockchain parser for transaction level details

I'm looking for transaction level data for both inputs and outputs. The znort block parser returns the type of data I'm looking for, however it doesn't seem to detect multisig transactions. Has anyone ...
0
votes
1answer
32 views

Send download link of a file after Bitcoin payment

I'm starting an online business. My website is hosted on OVH I would like to send a download link after a bitcoin payment. Are there specific stuffs I should be aware of? Is this difficult to ...
1
vote
0answers
55 views

Is mining difficulty leveling out (Spring 2015)? How does this affect the economics of Bitcoin?

Bitcoin mining difficulty has been through some interesting ups and downs lately. (I've supplied snapshots below to give context for future readers) Considering its long history of pretty much only ...
0
votes
1answer
34 views

Energy to confirm one block?

What is the minimum energy (or CPU operations) required for someone to confirm one block on their own, to launch a double-spend attack? How can I calculate this from the current difficulty or ...
0
votes
1answer
38 views

Why does BIP44 use non-hardened paths at all?

BIP44 uses hardening/private derivation on most levels: m / purpose' / coin_type' / account' / change / address_index but not on the change and address_index level. First of all, what does ...
1
vote
2answers
51 views

Simultaneously Solo and Pool Mining

It's possible to send shares both to a localhost GBT "pool" (e.g., Bitcoin Core's) and to a remote Stratum pool.* Now, if I discover a block, won't both my localhost GBT "pool" and the remote pool ...
1
vote
1answer
27 views

Why does `connect` perform worse than `addnode` for synchronization?

I've manually set many nodes in my bitcoin.conf file via the connect= property. I can see that, when run, bitcoind connects to most of these nodes successfully. However, I never see any blocks being ...
0
votes
2answers
46 views

Sending bitcoins to an un-owned, well-formed wallet

This is a follow-up question to: What happens if I mistype the address when making a payment?. Scenario: You're trying to send bitcoins to an address. You type in the wrong address, but the address ...
1
vote
1answer
18 views

How to redeem Non-standard script Tx (testnet instance)

Th testnet TxID 8d897ca91774a7fafa086a3275e679248d6bffee015d3b2efefd5dab00df152d has the following scriptPubKey: scriptPubKey: "OP_DUP OP_HASH160 5f1426c2ce4a8e1abaa9dbe819b6303eb8a25a26 ...
0
votes
1answer
40 views

Sample proof of work in Ruby, what am I doing wrong?

Given the following block, how do I verify the proof of work? I got this data from bitcoin-cli getblock and parsed in to a Ruby hash called data: ...
0
votes
2answers
58 views

Create alternative blockchain with proof-of-work

For learning purposes, I want to create an alternative special-purpose blockchain. It would use a proof-of-work function that is different than the one in Bitcoin. Short of forking bitcoin and going ...
0
votes
1answer
42 views

Pledging mechanism using Bitcoin

Is there an obvious way that I can achive the following with Bitcoin? An organizer sets a goal: an amount of bitcoins must be gathered within a specific amount of time Random pledgers send an amount ...
1
vote
1answer
51 views

How can I search for OP_RETURN data?

Is there any way to check for this data in blockchain? I want to search this value: 554e6963444320 and want to return this transaction ...
0
votes
1answer
21 views

bitcoinaverage.com price precision

i noticed that from the 13th of feb 2015 the bitcoin price becomes a lot more "noisy" on bitcoinaverage.com: does anybody know whether this is actually due to bitcoin price movements becoming more ...
0
votes
1answer
17 views

Meaning/Derivation of 32 byte TxID hash

A largely abstract question (set) I've tried to answer for awhile is the nature of a TxID (32 byte hex Transaction ID hash). First and foremost, I certainly understand the main function if this ...
0
votes
1answer
32 views

How much space does deduplication save?

Suppose you have multiple computers on the same network. Also, you use a block-level (note that 'block' is different in this context than what it usually means in Bitcoin) deduplication filesystem ...

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