Which aspect of blockchains? Do you mean to fully undertand the technical details or just a brief overview about blockchains that they are able to use it?

No, you can only use RBF for unconfirmed transactions. Otherwise your transaction was already put into a block and added to the chain.

It has to be easy. No setup, no sending to the lightning nodes, everything has to happen automatically.

I tested the wallet (was called zap when I remember correctly) and it would be too hard to set it up for a non-tech person. People don't want a complicated setup, they want an app on their smartphone which just works. That's it.

Did you also find wallets with any balance on it? Would be interesting if people still use them.

You didn't provide much info.

If you have the bitcoin CLI available, look for listunspent, createrawtransaction, signrawtransaction and broadcastrawtransaction.

What do you think? 25$ per day without any effort? Sure ...

I can only recommend that you learn some useful skills and after a few years you will have a decent income. Maybe software development if you prefer to work from home.

Thank you for your feedback. I will checkout the extension, I really like visual studio code.

I am pretty new to blockchain development and would like to know how I can get started. My idea would be an linux enviroment (proably ubuntu) with visual studio code.

I will use it mainly for qt wallets and will also checkout solidity. Is vs code suited for this or should I use another iDE?

I assume the function look up your address only in the listed ones and therefore you will get false as result. You could try to create a raw transaction and let electrum only sign it for you.

Just an idea, don't know if it will work.

Thank you. I used another approach, but your idea helped me to find the right solution for my issue.

e.g. (output truncated):

Result:

Thank you! Switching the server worked and I was able to broadcast the transaction.

Steps to reproduce
1. Create new segwit wallet with electrum
2. Send funds to an andress from this wallet
3. Send funds from this address

What does this error mean and how can I fix it?[/code]

I would like to query data with the CLI and parse the response. I am using the terminal with jq for this.

{                                                                                                                                                   
  "txid": "5756ff16e2b9f881cd15b8a7e478b4899965f87f553b6210d0f8e5bf5be7df1d",                                                                                                                                                                                               
  "blockhash": "0000000000000000027d0985fef71cbc05a5ee5cdbdc4c6baf2307e6c5db8591",                                                                   
  "blockheight": 371622,                                                                                                                             
  "confirmations": 160829,                                                                                                                           
  "time": 1440604784,                                                                                                                               
  "blocktime": 1440604784,                                                                                                                           
  "isCoinBase": true,                                                                                                                               
  "valueOut": 25.37726812,                                                                                                                           
  "size": 185                                                                                                                                       
}

My goal is to change the unix timestamps to another format and pipe the result to another command.

So, the block time should be changed from this
  "blocktime": 1440604784,                                                                                                                           

to this
  "blocktime": "18.07.2018"

I noticed a a nasty bug on the electrum wallet. If you use it regularly and don't have any change addresses left, electrum will create new ones for you.

If you then restore the wallet from the seed, the newly generated addresses aren't visible / availalable anymore. How can I check the correct balance on my new wallet? Would it be possible to sign from the missing change addresses?

This is the maximal cost for the standard gas limit of 21000 (typically used for a standard ETH transaction). You can adjust this with the "Gas-Time-Price Estimator" on this site.

I am not sure how many bytes a standard transaction need.

This is different from coin to coin. The best way to test it out is to search for a coin which has maternodes and a active testnet. Then you can just ask for coins on the testnet (they do not have any worth) and create a test setup.


No, but it is probably recommended. You don't know which kind of software you are executing, even if it's open source. Not every new altcoin is reviewed.


VPS stand for Virtual Private Server and is in the most cases just a separated Environment (An Operating System on Shared Hardware Resources) on a server.


Yes, could be. There are also many scams and they can infect your computer with malware.

You will find the most common wallets in the link from mocacinno.

Electrum is probably (I didn't check any statistics) the one which is mainly used. Before using it you should understand change addresses.

Do you mean the fee that you have to pay if you register from a blacklisted ip?

What help do you need? What do you want to learn?

I just quote this here. You should find all information about the required gas for the deployment of contracts in this article.

https://hackernoon.com/costs-of-a-real-world-ethereum-contract-2033511b3214

You can also minimize the costs by reducing the gas price, check https://ethgasstation.info/ for a safe low price.

You have a couple of options.

• The easiest one is to dump your private key and import it into another wallet
• You can also create, sign and send a raw transaction. This is a complicated one, if you are interested in it, just drop me a message
• You can download the blockchain to a external hard drive. Move the folder Bitcoin to E:\Bitcoin and then execute this command from your cmd
  
  • mklink /J C:\Users\Username\AppData\Roaming\Bitcoin E:\Bitcoin

Don't use online based web wallets, many of them are scam or could be hacked.