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December 15, 2018, 05:47:00 AM *
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961  Bitcoin / Bitcoin Technical Support / Re: Question about shared wallet on: November 18, 2017, 07:45:18 PM
If I copy my wallet.dat to another computer and generate new address on old computer and then send to new generated address 1 BTC,
will the wallet.dat on another computer be updated with new address and btc?

If yes - why its possible ?
It depends, depending on your wallet, you may not see the new address or the Bitcoin.

The Bitcoin Core wallet (and most other wallets) have this thing called the keypool. The keypool is just several (Bitcoin Core defaults to 1000) keys and their addresses that are pregenerated. When you get a new address, you are given a key from the keypool and a new key is generated and placed into the keypool. This is useful for encrypted wallets where you can get addresses and public keys without needing to decrypt your wallet first.

So if your wallet has a full keypool, then yes, you would see the new address and the Bitcoin on your other computer as it would see the transaction for a key in your keypool.

However your keypool may not be full. You could have taken all the keys from the keypool. If your wallet is not an HD wallet (so Bitcoin Core wallets made prior to Bitcoin Core 0.13.0), then once you have retrieved the keys from the keypool, all keys after that will not be the same (aka any newly generated keys are not the same). This is because they are randomly generated.

If your wallet is an HD wallet (Bitcoin Core wallets make with Bitcoin Core 0.13.0 and later) then you will be able to get the same keys after the keypool is exhausted. This is because the wallet generates keys in a deterministic manner from a given seed that is stored in the wallet. So you will generate the same keys when the keypool is refreshed.
962  Bitcoin / Development & Technical Discussion / Re: Will LN be able to retrieve stuck addresses? on: November 18, 2017, 07:37:59 PM
Will LN allow me to move these funds?
No, it will not. LN requires you to make an on chain transaction to be able to begin using LN, so if you don't/can't make an onchain transaction with those coins, then you cannot use LN.
963  Bitcoin / Bitcoin Technical Support / Re: Bitcoin ABC stuck at block 478558 and not syncing on: November 18, 2017, 07:35:06 PM
I started BitcoinABC wallet pointing my old bitcoin core wallet, and after reindex program stuck at block  478558 and not syncing any more.
This is expected behavior. 478558 is the last block in the Bitcoin blockchain which is also part of the Bitcoin Cash blockchain. In order to fix this, you will need to delete the Bitcoin blockchain following this block and reindex. This will then cause Bitcoin ABC to not know about the Bitcoin blocks which it thinks are invalid and download the Bitcoin Cash blockchain.
964  Bitcoin / Development & Technical Discussion / Re: listunspent: get count of UTXOs rather than details? on: November 17, 2017, 07:04:35 PM
What's the main reason these commands are available in Core?
These commands are really not for the average user. They are for interacting with a bitcoind that's running on a server with a script or from the command line. They're also used for testing.

Would it make sense to add to listunspent extra parameters that show summarized info?
It would not make sense to add that to listunspent. You could add it somewhere else though, like getwalletinfo.
965  Bitcoin / Development & Technical Discussion / Re: listunspent: get count of UTXOs rather than details? on: November 17, 2017, 06:47:56 PM
I don't think that is possible, but you can just pass the output of the listunspent command to a JSON parser and have the JSON parser tell you how many elements are in the array.
966  Bitcoin / Bitcoin Technical Support / MOVED: Hello, Help please with a LTC transaction....oops on: November 17, 2017, 06:05:19 PM
This topic has been moved to Trashcan.

Duplicate of
967  Bitcoin / Development & Technical Discussion / Re: How do contentious hard forks actually happen? on: November 17, 2017, 02:29:37 AM
Ok that makes sense now, thanks so much for the detailed response.  So, aren't there many other Bitcoin forks that random people create just by copying the code and changing something?  Does this happen all the time and we just don't hear about it? 
Yes. IIRC there have been several forks of Bitcoin but no one hears about them nor cares about them.
968  Bitcoin / Bitcoin Technical Support / Re: Node Config Question: Any way to force incoming peers to be updated peers? on: November 17, 2017, 01:47:31 AM
No, there is no way to force peers be a certain version. However you can write a script which checks the list of connected peers and bans any peer which is not a certain version. Note that the user agent string which announces the version number can be faked, so it is not necessarily reliable to trust that.
969  Bitcoin / Development & Technical Discussion / Re: How do contentious hard forks actually happen? on: November 17, 2017, 01:46:13 AM
Who actually creates the new chain and how?
Anyone can create a chain split and hard fork. You do so by releasing software which has incompatible consensus rules with the current consensus rules.

Is this just the development community?  How can a minority of the devs create a new coin
It is not "the development community" but rather a specific group of developers. As I said, anyone can do whatever they want; it's an open source project, they can fork the source code and change it.

if consensus is required to change the protocol?
Consensus is not required to make a fork and an altcoin. Consensus is required to make a fork and have everyone agree that that fork is still called Bitcoin.
970  Bitcoin / Bitcoin Technical Support / Re: How do timelocked transactions work? on: November 17, 2017, 01:34:48 AM
A transaction with a timelock means that the transaction itself cannot confirm before the timelock (either a block height or a timestamp). However a conflicting transaction (one that spends the same inputs) could be created and that transaction can still confirm.

In order to make coins that are unspendable until after a certain time or block height, you will need to create an address that uses OP_CHECKLOCKTIMEVERIFY. Only coins sent to such an address are guaranteed to be only spendable after a certain time.
971  Bitcoin / Bitcoin Technical Support / Re: Download blockchain on: November 14, 2017, 10:37:27 PM
I'm sorry maybe I understand. If I download a bootstrap.dat - you're saying the file can be altered. Wouldn't the rest of the Bitcoin network reject the corrupted transactions? Please explain what the real-world implication and danger is in using a bootstrap.dat from a third party.
The rest of the network does not know nor does it care what data you have in your bootstrap.dat file. It isn't a file that nodes create and give to other nodes; it's a file created by humans and given to other humans.

An altered bootstrap.dat file is an attack on you, and whoever else has that file. It is not an attack on the network. At the very least, it could result in you having a completely different blockchain and then having to download the blockchain again from your peers when your node realizes that that chain it has has less work than the chain that other nodes have.
972  Bitcoin / Bitcoin Technical Support / Re: Download blockchain on: November 14, 2017, 10:11:08 PM
It is not faster for me. Taking too many hours to process the transactions. I'm still at Oct 2015 after 24 hours. I rather download a bootstrap.dat ... I thought all the transactions had to be verified even if you download a bootstrap.dat.
Using the bootstrap.dat is slower because you have to download then verify all of the blocks after the download. It is faster to let it sync normally because you are downloading and verifying blocks at the same time.

How can there be corruption of data if you require consensus from 51% of peers? Its all old confirmed transactions anyway...
That's not at all how Bitcoin works. Anyone can just give you data; it's not like the bootstrap.dat is some magic file that can't be altered. Your node still must verify that the blocks provided are correct. 51% of nodes has nothing to do with that.
973  Bitcoin / Bitcoin Technical Support / Re: I lost everything, I lost my 5 BTC on: November 14, 2017, 10:08:36 PM
This thread is being locked because it is being spammed with "Sorry for your loss".
974  Bitcoin / Bitcoin Technical Support / Re: Where I can find updated bitcoind API ? on: November 14, 2017, 10:06:14 PM
Use the help command (e.g. bitcoin-cli help)

That will list each of the available RPC commands. You can then do help <command name> to get the help for each command. That will explain what the command does and what the arguments are.
975  Bitcoin / Development & Technical Discussion / Re: How will Lightning work in practise? on: November 14, 2017, 10:04:36 PM
How will Lightning work in practise? Iíve read, that in practise Lightning network wonít work as a peer to peer network, but more like a hub network.
That article is completely incorrect. It assumes an extremely degenerate case will be what actually happens even though that is extremely unlikely. The model and fundamental understanding of LN in that article is completely incorrect. Here's a response to that article that explains why it is incorrect:
976  Bitcoin / Bitcoin Technical Support / Re: SegWit change address becomes legacy??? on: November 14, 2017, 09:56:34 PM
Because segwit wallet support is not fully implemented in Bitcoin Core, all addresses generated (including change), will be non-segwit addresses. Although it is capable of converting a non-segwit address into a segwit address for you to receive it, the wallet will not do that automatically for change addresses.
977  Bitcoin / Bitcoin Technical Support / Re: Sent to an "Unused" Armory Address from my Offline Wallet. How do I recover? on: November 14, 2017, 05:35:42 AM
The address is already in your wallet and there is nothing that you need to do. Since your wallet is offline, it does not know that it has been used, but that doesn't really matter since you shouldn't be doing that with an offline wallet anyways. Getting addresses should be done on your online wallet.
978  Bitcoin / Bitcoin Technical Support / Re: Reuse an address on donation website? on: November 14, 2017, 05:32:53 AM
I've installed electrum and there is an address in my wallet's "Receive" tab.  I could just post this address as a bitcoin: link, and that would be all that's required to receive donations, correct?

I have read that it's highly recommended *not* to reuse bitcoin addresses, to preserve privacy.  I honestly do not expect to get very many bitcoin donations at all - could I simply change the donation address manually if I receive a donation to the current address?  

Is there any reason to be concerned if I receive a few donations to the same address before changing it?
No. You will lose some privacy, but you are already losing privacy by having a public address.
979  Bitcoin / Bitcoin Technical Support / MOVED: How to revert -walletbroadcast=0 and -zapwallettxes in Core QT Wallet? on: November 14, 2017, 05:30:37 AM
This topic has been moved to Trashcan.

Duplicate thread
980  Bitcoin / Bitcoin Technical Support / Re: My balance and my transactions doesnt show in my wallet on: November 14, 2017, 05:30:24 AM
If you are fully synced, start Bitcoin Core with the -rescan option. Note that this will make startup take a long time and prevent you from using Bitcoin Core for a while as it needs to walk through the entire blockchain.
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