0
votes
1answer
6 views

Bread wallet iOS app

I am new to bit coin and the bread wallet app, so please excuse me if this is a really obvious question. I have read a lot of information saying that it is vital to use a new address every time I ...
2
votes
0answers
8 views

How to create the same (2 of 3) multisig adresses as electrum's multisig wallets with createmultisig?

Looking to create 2 of 3 multisig addresses with the electrum console with public keys (not the master public keys): electrum createmultisig 2 '["1st public key wallet 1", "1st public key wallet 2", ...
1
vote
0answers
12 views

Where is the spec of HashCash so that I can implement it in Java from scratch?

I would like to implement HashCash in an efficient/fast/garbage-free way. Is there a spec to do so? How can someone go by implementing HashCash from scratch?
1
vote
2answers
22 views

What is the hash function used by Bitcoin proof-of-work?

Probably a simple question, but I believe it is important to state it clearly for the beginners like me out there. What is the hash function used for the Bitcoin proof-of-work? What implementations ...
0
votes
0answers
15 views

Bitcoin transaction failed, but missing btc from wallet

I was trying to pay via bitpay, but the transaction took very long, and now 11 hours later niether bitpay nor I have the bitcoin. 793536e64c8e4febc81c57ffa2e5da4a7c44f2679e59b4f5dea840382afe2197 ...
0
votes
1answer
7 views

How does a filterload client that recieves an incoming transaction retrieve the transaction it's spending?

Suppose that your SPV client receives an incoming transaction. How can it tell whether it spends a real outpoint? If you knew the block, you could add the txid to filterload and request the block ...
0
votes
1answer
14 views

Compute TxID of Bitcoin Transaction

Originally posted to StackOverflow but with no response. Thought I might have better luck here. I've successfully created a Bitcoin transaction in C# according to the protocol specifications. Here's ...
0
votes
0answers
7 views

I'm new and need some advice [duplicate]

I'm wanting help on what's the most trusted places are to visit for buying and selling bit coins and how does it work from there, I'm wanting to buy something from a trusted website and vendor which ...
1
vote
0answers
7 views

Validate chain from `valid-headers` to `valid-fork`

The getchaintips JSON-RPC returns multiple branches of the blockchain. Chain tips can be in various statuses. The active and valid-fork are already validated chains. There is a valid-header ...
-3
votes
1answer
34 views

Is it possible to mine bitcoin to get a profit?

I really want to get into mining but I want to know if mining for bitcoin is even profitable anymore. I know that CPU mining isn't profitable at all but is there some way that I can still make a ...
0
votes
0answers
11 views

Help getting bitcoin transaction confirmed [duplicate]

I made a withdrawal from satoshidice.com and they apparently did something to screw up sending my bitcoins as the transaction was 8 hours ago and it is still unconfirmed. Can anyone help me? Thank you ...
1
vote
0answers
12 views

publicly available json-rpc node for bitcoin-cli connection

There is a service provided by blockchain.info described on json_rpc_api page. More or less it describes the API that user can use to access their blockchain similar way as using bitcoin-cli to own ...
1
vote
1answer
6 views

Historical bid/ask prices

I'm searching for BTC historical prices and people often link this source: http://api.bitcoincharts.com/v1/csv/ Now, I'm familiar with forex historical prices where I have tick or OHLC data with ...
1
vote
1answer
48 views

i have good pc can i mine on it, if i don't have to pay for electricity?

i have gtx 970 g1 gpu and intel i7 4790k cpu. i dont have to pay for my electricity costs. i used to play games but now i don't play them any-more. i was hopping someone will tell me if i can make a ...
2
votes
0answers
61 views

I just lost 1.36275883 ($313), and I don't know how it happened or how to prevent it again

I just opened my multi bit wallet, and the 1.36275883 that was in there is now gone. It loaded a brand new wallet, so I don't even have my old wallet with the old transactions or password. I know ...
1
vote
2answers
50 views

How to store data on the blockchain?

I am wondering if it is possible to give someone a bitcoin transaction ID and with that he can read some hidden data, like the blockchain.info notes on transactions, but for real, stored in the ...
0
votes
0answers
31 views

Get as many blocks as possible (stale, invalid, orphans)

I would like to download (and access) as much blocks as possible - including stale (extinct) blocks, orphans blocks and invalid blocks. I have 0.11 official client. My node is already synchronized but ...
1
vote
1answer
17 views

How does Bitcoin Core's Coin Selection prevent change to be a dust output?

Bitcoin Core's Coin Selection optimizes for minimal change outputs. How does Bitcoin Core prevent Change outputs of sizes below dust threshold from occurring?
0
votes
1answer
21 views

Bitcoin Core Network Configuration

I am having difficulty loading the full node for my new Bitcoin Core wallet. I use a Mac and share a modem with my apartment complex. I believe a manual network configuration is out of the cards for ...
0
votes
1answer
18 views

Hot wallet and cold wallet

If you have a online site that accepts bitcoin deposits and users can withdraw their balance, Is it possible to have the deposits go to the watch-only address of a cold storage and the withdraws come ...
0
votes
1answer
16 views

question on Armory bitcoin wallet scripting

Has anyone built the Armory Bitcoin wallet successfully and created the wallet using python and Armory as a library instead of using the GUI?
0
votes
0answers
52 views

What does this blockchain.info error mean?

I added bitcoin payment to my website with bitcoin daemon, but one user is having an error with the blockchain.info API: Warning! this bitcoin address contains transactions which may be double ...
0
votes
1answer
17 views

What are spent transactions?

Satoshi's paper says (https://bitcoin.org/bitcoin.pdf): Once the latest transaction in a coin is buried under enough blocks, the spent transactions before it can be discarded to save disk space. ...
2
votes
0answers
25 views

In Ethereum, what is an uncle block?

In Ethereum, what is an uncle? Why does Ethereum take this approach, instead of having a single chain of blocks back to the genesis block? If you mine a block, and it only gets included as an uncle, ...
0
votes
1answer
15 views

How do you spend a P2SH transaction?

I've been running into a lot of trouble getting a transaction to spend coins in a multisig address. I create the raw transaction When I go to sign, I get "Operation not valid with the correct stack ...
-1
votes
1answer
21 views

unspent outputs and change addresses

Their is one thing I do not understand about unspent outputs and change addresses. For example lets say a person has 5BTC in a wallet, and they have 2 unspent outputs of 3btc and 2btc. They one day ...
1
vote
1answer
14 views

multiple deposits using the same address for investment

i am new to the bitcoin thin and i want to know if i can keep the same adress for send and recive some money. I use multibit HD wallet. Beyond the line is what the help of he investment party tells me ...
1
vote
1answer
21 views

private key to wif - need help converting to base58encode (step 6 to step 7)

I am trying to learn more about how bitcoin addresses are created. I am following along with the tutorial at https://en.bitcoin.it/wiki/Wallet_import_format I undertsand how they do the first six ...
0
votes
1answer
35 views

Mysterious transfer of BC

Sent coins from one online wallet of mine to another Coins were immediately credited from the first wallet which now has a balance of zero, but did not appear in the second wallet. Mt initial thought ...
0
votes
1answer
16 views

How to add bitcoins in my wallet? [duplicate]

I'm new to this BTC world, one day someone offered me to pay using BTC and made me create a wallet on https://multibit.org I recently used it to pay for something online, and another transaction and ...
0
votes
2answers
22 views

Can Bitcoin Core be used to create a raw transaction for CLAM altcoin?

Clam is an altcoin that issued that altcoin to the owner of the private key of each and every Bitcoin address that had funds (0.0001 or more) on May 12, 2014. I don't want to install the Clam client. ...
0
votes
1answer
51 views

Creating a Bitcoin site

My question is this: Lets say I wanted to create a bitcoin site, where users register and can deposit bitcoins into their account. should i use my MPK to generate infinite addresses, so after a user ...
0
votes
1answer
13 views

Multibit notification

I have a blockchain.info account and I would like to move my wallet from the web interface to the multibit client. However, I need that once an incoming transaction have been confirmed I need to ...
0
votes
1answer
34 views

Shabal256 code explanation

Can anyone please explain the code below with comments? What are pbegin & pend ? What is ( I believe it is data, where it comes from ?): (pbegin == pend ? pblank : static_cast<const ...
0
votes
1answer
13 views

Account Addresses after moving wallet.dat to new computer

I reinstalled bitcoin on a new computer, and took my old wallet.dat file from an old pc that had v.0.3 of the bitcoin software. I had 2 receiving addresses when I started. When I typed ...
1
vote
0answers
29 views

Can i put Bitcoin Bitcore on Flashdrive?

I am a new user, Downloaded bitcore wallet and blockchain. I have received several bits of information of how much of a risk it is to leave your wallet live on the pc. I read about creating a cold ...
0
votes
1answer
15 views

Bitcoind listtransactions return only received transactions not showing send payment

I try to get all transaction of an account using this: listtransactions Ammadkhalid But this is show me received transaction not send here screenshot but in php:
2
votes
1answer
23 views

XPUB export from MultiBit HD wallet

Is there a way to to export/copy wallet's XPUB from MultiBit HD wallet (windows)?
0
votes
0answers
19 views

How to echo array into string in array of arrays in php orbitcoin wallet

I want to see the total balance of account in web wallet of orbitcoin but i can't find any solution so i want to use listaddressgroupings to see the total balance. But there are a arrays opening but ...
0
votes
1answer
14 views

How does the scriptPubKey for this test vector work?

The scriptPubKey for cbebc4da731e8995fe97f6fadcd731b36ad40e5ecb31e38e904f6e5982fa09f7 is: ...
0
votes
0answers
14 views

how to get total send balance of account in orbitcoin wallet?

I want to see my account balance in wallet using console but when i use getbalance test its only show me total receive balance? There is many account that i want to see total balance but i try ...
1
vote
0answers
11 views

GPU VanityGen with AES Encryption?

I'm getting back into Bitcoin and have started pooling savings together into a wallet. I'm moving on to cold storage and need to order some metal cards to keep safe somewhere. I need to generate an ...
0
votes
1answer
87 views

Have I lost my Bitcoins?

Ill start from the beginning. Im really new to bitcoins so being naive ive jumped in downloaded a wallet (bitcoin core) got my adress and set of buying 1 bitcoin. Now I bought the bitcoin and it all ...
0
votes
2answers
20 views

Where is the code making OP_RETURN a standard transaction type?

I am looking through the bitcoin github history. I am trying to find the commit where OP_RETURN became accepted as a standard tx. This was included in the changelog for Bitcoin Core 0.90. Any help ...
1
vote
1answer
27 views

Why aren't block solutions sent to a multicast address?

In computer networking, multicast (one-to-many or many-to-many distribution) is group communication where information is addressed to a group of destination computers simultaneously. I think the ...
2
votes
2answers
38 views

bitcoind and bitcoin-cli 'unrecognized', how can I access them from command line?

I have downloaded and installed the precompiled Bitcoin Core OS-X (also successfully synchronized). Every tutorial I have seen then directs one to begin using the executables bitcoind and ...
0
votes
1answer
9 views

How can I get the Fee involved in a Bitcoin transaction using RPC client (bitcoin-cli)?

I performed a bitcoin payment in the testnet, here is what I get when I execute bitcoin-cli gettransaction "11b8d5f89793e83e9e10b7ee51fa1b3445f6029f7d7efe4c82b3b261ec513a0e", as you can see the info ...
1
vote
1answer
35 views

I have lost my blockchain.info wallet identifier and used a fake email, does anybody know if its recoverable still?

I have the password and mnemonic phase, thanks so much for any help
0
votes
0answers
63 views

Writing a GPU Bitcoin mining client (learning purposes)

I want to write a basic GPU miner from scratch for learning purposes. By "from scratch" I don't mean that I am unwilling to use libraries but I want it to be similar to real GPU mining software, and ...
1
vote
1answer
21 views

Escrow Services [closed]

Can anyone recommend an honest/reliable escrow service? With the ones I found searching the internet is that few of them are publishing their physical location so it's difficult to verify they ...

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