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December 10, 2018, 07:57:59 AM *
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1  Economy / Services / Re: MOONX Sig & Avatar campaign on: August 30, 2018, 05:52:12 PM
Btctalk name: Xynerise
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2  Alternate cryptocurrencies / Altcoin Discussion / Re: ERC20 question on: August 11, 2018, 05:40:29 PM
What are ways to do a proper audit?
You'll have to pay a developer with experience in solidity to go through your contract for bugs, etc.
Zeppelin is one of the many companies that audits smart contracts.
and does it always have to be on ropstan network?
Ropsten test net is one of the test nets for ethereum where you can test your smart contract to see if it does what you want it to do.
You don't have to use the ropsten testnet, there's another called Kovan, and you can also deploy your own ethereum block chain locally on your computer using geth.
3  Economy / Services / Re: [OPEN] ⚡BQT Signature Campaign | Member - Hero | 0.0007 BTC /Post ⚡ on: August 11, 2018, 01:17:42 PM
Bitcointalk Profile Link:;u=1250855
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4  Bitcoin / Bitcoin Technical Support / Re: Can a miner please process my transaction, reward will be given on: June 28, 2018, 07:22:11 PM
You'll need an account on the website though.
5  Bitcoin / Electrum / Re: BTC transaction sent to wrong receiving address on: June 25, 2018, 07:12:54 PM
On the console enter

If it doesn't return true then that address didn't come from your Electrum wallet.

You'll have to check if you have a malware/fake Electrum or a clipboard malware that changes any Bitcoin address to that of the hacker.
6  Bitcoin / Development & Technical Discussion / Re: Can I use my Electrum 12 word seed to gain access to my BTC on another wallet? on: June 22, 2018, 09:00:51 AM
No, Electrum uses a different (and superior) derivation scheme than BIP 39 so it's not possible to generate it on another wallet, however the Electrum source code is open so it's not possible for Electrum to completely disappear from the internet.
Also, you don't need internet access to access your private keys on Electrum, so you can always export your private keys from Electrum and import them into another wallet even if Electrum servers are shut down.
7  Bitcoin / Electrum / Re: Is there anyway to send a transaction in electrum without a fee? on: June 21, 2018, 10:30:40 PM
To set fees manually, go to Tools, then Preferences
, Tick "edit fees manually"
Then you can set a fee you want.
Note that  0 fee transactions won't be relayed by nodes on the Bitcoin network since 0.15
8  Bitcoin / Development & Technical Discussion / Re: wallet.dat file need periodical backup? or just one time? on: June 21, 2018, 05:43:27 AM
Any time a change is made to the wallet a new backup is required (and as always, its smart to have your private keys saved as well.)
MEANING: You encrypt your wallet / change your password or you receive new coins, new back up needed.
You don't need to backup your wallet once you receive coins if it's a HD wallet.
Also backup of wallet is the same as backing up your p private keys.
9  Bitcoin / Electrum / Re: Electrum 3.0.5 wallet problem on: June 19, 2018, 04:09:17 PM
Check the lower right hand corner of the screen, is the icon green or not?
10  Alternate cryptocurrencies / Altcoin Discussion / Re: Keystore/JSON File possible to get back? on: June 18, 2018, 05:08:47 PM
It's not possible to retrieve it any other way.
When you set up the wallet for the first time they tell you this.
So unless you can successfully recover the json file, your funds are gone.
11  Bitcoin / Bitcoin Technical Support / Re: Bitcoin Core questions on: June 17, 2018, 07:36:52 PM
It depends on what exactly you want to store.
If you need access to your Bitcoins then you just need your wallet.dat file as it is what contains your private keys.

If you want to copy the blockchain itself, eg to bootstrap another computer, then you just need to copy the chainstate and blocks folder.
12  Bitcoin / Bitcoin Technical Support / Re: Big Mistake, transaction from BTC to Tether (USDT), please help. on: June 17, 2018, 07:23:35 PM
Technically, Bittrex can recover your Bitcoins but that would be at a security risk to them as they would have to import the private key for their usdt wallet into another Bitcoin wallet, which threatens the safety of the private key which is why they'd only do that if the amount exceeds $5,000
Only Bittrex can help you because only them have the private key to that address.
If they refuse to help you because your transaction is joy up to their limit, then there's nothing you can do.
13  Bitcoin / Development & Technical Discussion / Re: How to prevent 51% ATTACK on new coin on: June 17, 2018, 07:17:59 PM
No one would attack your coin for no reason because of opportunity cost of just using that hash power to mine (another coin) legitimately.

You could look into merged mining with another coin eg BTC.
14  Bitcoin / Bitcoin Technical Support / Re: Every wallet address has just one private key which can be generated again? on: June 17, 2018, 04:31:27 AM
Every private key has its own public key, which is basically your address. You can search for 'public private key cryptography' to find more info about this, there are many good, pictured, explanations available.
Public key is not the address -- the address is a HASH of the public key.
15  Bitcoin / Development & Technical Discussion / Re: MAX_MONEY's possible max value is? on: June 17, 2018, 04:27:52 AM
Its 92,000,000,000 ?

Int64's Max value is 9,223,372,036,854,775,807

But MAX_MONEY is multiply by satoshi, ( * COIN ) so it multiply by 10,000,000, right?

Then so max possible total coin supply (MAX_MONEY) is approx 92,000,000,000?
As has been explained before in this forum, that's just an integer overflow check.
The number of coins isn't explicitly stated but depends on the block reward and halving schedule.
16  Bitcoin / Development & Technical Discussion / Re: If wallet.dat shared or stolen, then encrypt it? on: June 17, 2018, 04:26:31 AM

Depends, if the wallet isn't HD (Hierarchical Deterministic) (Ex. Bitcoin Core Wallet),
Bitcoin Core has been HD since 0.13.0
17  Bitcoin / Development & Technical Discussion / Re: Different sites report different blockchain sizes? on: June 16, 2018, 03:00:12 PM
There's no way to tell it's "no longer needed" though.
There's no central arbiter that decides whether a block is needed/valid or not.

Each node can decide for his own whether a block is need (e.g. part of longest chain) or valid (has to be validated anyways).
Okay, that came out wrong.
I meant no node can tell if its block (the block it has received) is not going to be orphaned in the future for a block with a higher POW.

Theoretically it still would not be necessary to store this block. In case of a reorganisation the block(s) can easily be broadcasted / received via the network.
If no one stores blocks where do nodes get blocks to bootstrap from? Huh
Obviously for a node to receive a block from a peer, another node has to have stored it then sent it.
If you don't store it, you can't send it.

Do most clients (bitcoin core?) really store those orphaned blocks (especially from years ago)? If so, is there a specific reason why it has been decided to keep them ? Or are they just kept because there is no real reason to delete them?
AFAIK, orphaned blocks are stored in the node's blockchain forever, iff it received it when it wasn't orphaned yet.
No node would upload a block that wasn't part of the canonical chain (ie a new node in the network won't receive old orphaned blocks)
18  Bitcoin / Bitcoin Technical Support / Re: How can P2SH outputs be spent? Non multisig. on: June 16, 2018, 02:41:32 PM
This is an example of an anyone-can spend address: 3MbZjYS1Kjo5An9vVCwZYTd2JeobwjUsFh.
The redeemscript is
which is
The redeemscript of the address is the solution to the equation z + x = 7; x + y = 8; z + y = 9.
19  Bitcoin / Electrum / Re: Transaction confirmed on Coinbase but not on electrum wallet on: June 16, 2018, 02:23:06 PM
It says synchronising
Let it synchronise then.
It shouldn't take time to download the block headers, depends on your internet connection, or the server you're connected to.
Either check your internet connection, or connect to a different server.
20  Bitcoin / Development & Technical Discussion / Re: How to save on fees with bech32 without having to send for a bech32 before on: June 16, 2018, 02:10:23 PM
Soon tutorial on Electrum, Bitcoin's lightweight and alternative wallet, but it will not be as easy as bitcoin core wallet.
I don't think it'll be possible on Electrum since it uses one derivation path for each wallet.

PS Samourai mobile wallet on Android has the option to receive change to like addresses.
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