0
votes
0answers
3 views

Is it possible to import transaction history from an old electrum wallet to a new electrum wallet?

I see there is an option to export history but no option to import history. It would be nice to keep all my history in one wallet. Thx.
1
vote
0answers
8 views

How does this patent affect Bitcoin? [migrated]

We found a patent that seems to cover sending and receiving funds via Bitcoin - how does this affect Bitcoin and Bitcoin based companies ? http://www.google.com/patents/US20080195499 "A system ...
1
vote
0answers
7 views

Can bitcoin-qt use imported address as a change address?

If I import a private key into a bitcoin-qt wallet, is it possible that some day some transaction I send from the wallet will use its pair address (the bitcoin address created from this private key ) ...
2
votes
1answer
63 views

Why do some outputs have a zero value and no address?

What does it mean when an output has a value of zero and no address? I'm looking at some fairly recent transactions, and I don't understand what this means. Here's an example: ...
1
vote
1answer
19 views

What prevented NXT from being distributed the same way bitcoins are?

As Nxt's generating accounts receive now the transaction fees of the transactions included in the block they forged, it would be possible to add some new NXT to the balance of the generating account, ...
0
votes
1answer
7 views

Hot to set TXID in rawtransaction?

My question is if I can set the TXID in a raw transaction and send it after it with 'sendrawtransaction' (from the qt console)? If not, is there a way to do it? And if there is a way, does it means I ...
2
votes
1answer
19 views

What other whitepapers are there for coin distribution models like POW (proof of work) and POS (proof of stake)?

I'm looking for other types of distribution models for crypto coins that are like POW (proof of work) and POS (proof of stake). I'm assuming these are a type of distribution model for coins, or is ...
1
vote
2answers
34 views

How to create the <sig> <PubK> part in “scriptSig”?

I've decoderawtransaction and see in the vin part a "scriptSig" ,which I believe to be the "unlocking script" . Assuming I have the private key in a paper wallet and someone send me transaction to ...
0
votes
1answer
13 views

Unable to receive/preview funds due to un-synced wallet

I bought bitcoins and sent them to the wallet, however the wallet is not synchronized and as a result I cannot see my bitcoins. Will I be able to see them as soon as the synchronization process ...
1
vote
1answer
38 views

Are transactions in a block decided by mining pool operator?

My assumptions: Most pools have an operator. All individual miners part of the pool work on block with address of the coinbase transaction owned by pool operator. pool operator gets all the bitcoins ...
1
vote
0answers
6 views

Armory 0.93 on Testnet: consistent unconfirmed Txs sent from connected Bitcoin-cli (log attached)

Running Armory (0.93.0.82) on Win7 x64 with the following flags: "C:\Program Files (x86)\Armory\ArmoryQt.exe" --testnet --datadir=d:\data\armory\testnet3 --satoshi-datadir="d:\data\bitcoincore" ...
1
vote
1answer
14 views

Using bitcoind JSON-RPC, how to get transaction from input address?

I have an address from which all unspent txouts were used in a single transaction. How can I find out what transaction was that? In my node instance, listtransactions will not list addresses that ...
2
votes
1answer
19 views

Testing blockchain forks

I want to test if a service can manage a blockchain fork. However there is no way to get bitcoind to create test forks under the regtest mode. I've tried modifying it to generate blocks with arbitrary ...
1
vote
1answer
24 views

Reward system bitcoin

I'm not entirely sure how the reward system in Bitcoin works. So, every 10 minutes a block is solved and 25 bitcoins are rewarded to a miner (or group). This happens in proportion to the amount of ...
-1
votes
0answers
23 views

Bitcoin Game Theory Analysis

I'm looking to analyse bitcoin for a (rather introductory, low-level) game theory course. Game theory concepts I'd like to explore with regard to bitcoin: strategic games with ordinal preferences and ...
1
vote
1answer
16 views

thin-client remote node lying through omission

is there a way for a non-full node (ie a node which does not contain the full blockchain) to know when it has received all transactions associated with an address? i understand that it is possible for ...
1
vote
1answer
28 views

Why did Litecoin choose the scrypt factors that they did?

Litecoin uses the scrypt factors (N=1024, r=1, p=1) This means that each hashing thread takes 128kB of memory. The scrypt paper recommends r=8. Colin Percival, the creator of scrypt, has said: Q: ...
0
votes
2answers
34 views

Can I build a mining ASIC from parts I find online?

I've noticed that there are all kinds of cards, blades, and other parts of ASIC mining rigs for sale on eBay. Is it possible I could buy some cards and blades and build my own high end mining ASIC ...
0
votes
1answer
28 views

Where can I find a full list of Bitcoin mining hardware?

I want to know where I can find a full list of Bitcoin mining hardware. I don't want a list of the most profitable hardware, I just want a list with the greatest number of Bitcoin miners (don't care ...
0
votes
2answers
26 views

How do I get to the value in the 'scriptPubKey' part of the transaction ?

How do I get to the value in the 'scriptPubKey' part of the transaction ? The sender knows only the address (1A3XjcuZmcszX2tGoVn1TrMNchuHwdAxZV) so how did he get into ...
0
votes
1answer
26 views

How to read a tx's comment?

How can I retrieve the comment field from a payment transaction that I made from my QT wallet? I can see the comment when I click "Show transaction details" in my QT but I cannot find a way to do ...
2
votes
2answers
47 views

What Ripple API libraries are available?

I am wondering, what libraries are out there for communicating with Ripple through its API (either websocket or JSON RPC)?
0
votes
1answer
25 views

What version byte will produce a Base58 encoding starting with X?

What is the Value of X in Base58? The Problem is when I referred to this table: https://en.bitcoin.it/wiki/Base58Check_encoding I in the end come up with D when I used 30, but I want X, so what will ...
2
votes
1answer
47 views

Is there a proof of work system which takes significantly more memory to generate than it does to verify?

Litecoin resists GPU speedup by using an scrypt-based hashing function that takes some amount of memory to generate and verify. The problem with this is that the r parameter needs to be set high ...
0
votes
1answer
14 views

How bit coin is generated during mining? [duplicate]

I know that when someone is able to find a block and hash that can be attached to the chain, he will be awarded with "the newly found bit coins" However, isn't mining simply finding the hash? Where ...
1
vote
1answer
25 views

Why am I unable to post two transactions (the second from the change address of the first) in the same block?

I'm attempting to make a transaction on the testnet with an OP_RETURN and a change address in it, and then make a second OP_RETURN transaction from first transaction's change address in the same ...
0
votes
0answers
16 views

What happens when the Block Reward of a Currency is Changed to a Greater Value? [duplicate]

What Happens if the Reward for block solving is changed to a very great extent and if most / all of the users update to that version with the edit.. For example if block reward is 12 x and it is ...
1
vote
2answers
32 views

Transaction unconfirmed after almost 2 day! Help!

I tried to send a bitcoin transfer Wednesday evening and it is still unconfirmed. It says "fees 0" but I have my block chain account set to "use recommended fee" by default. Can anyone help me get ...
0
votes
0answers
16 views

Why doesn't changing MAX_MONEY change the maximum number of coins?

I've changed MAX_MONEY to decrease the number of coins issued in my altcoin, but it's not working. Why?
0
votes
1answer
21 views

My altcoin bitcoinj fork is failing when trying to compile an Adroid wallet

I've been sent a bitcoinj fork which is meant to work for the android wallet I'm building. Unfortunately it seems to be causing a failure when tests are run during the wallet compile. I get the ...
-1
votes
0answers
14 views

getting error while building my new altcoin?

While Building my new alt coin, I get one single error, I didn't understand whats that means and how I can resolve that. I have below mention steps to build my bitcoin wallet in windows. ...
2
votes
2answers
65 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 ...
6
votes
1answer
180 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 ...
2
votes
1answer
35 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 ...
1
vote
0answers
46 views

How I make a portable version of Bitcoin for Ubuntu?

I want to create a bitcoin wallet executable file in Ubuntu with all its dependencies. So when use that file from some other system it will work perfectly. How I make a portable version of Bitcoin ...
2
votes
1answer
34 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
39 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
27 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
20 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
39 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
20 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
26 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
41 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
39 views

how to receive my awards? [closed]

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
46 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
18 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
40 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
29 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
22 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 ...

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