To build a backend

[itmsme]

now,web3t lib has built the connection for me when I use this

I wonder how does it works if I do not want to use this lib,how to build a wallet backend which is starting with an empty project.

[askucher]

web3t library includes 4 embedded plug-ins for btc, ltc, eth, dash which uses public nodes for get balance,send transaction operations.

You may ask the question - is it secure?

We answer - Yes because web3t use raw transaction or signed transaction request only.
It means that web3t signs transaction locally and publish the hash of the transaction and owner's signature

Here the list of available coins

https://github.com/ethnamed/web3t/tree/master/plugins

Here is an example of bitcoin connection for testnet and mainnet.

https://github.com/ethnamed/web3t/blob/master/plugins/btc-coin.ls

[itmsme]

could you explain how it works with the public node, such as btc, how it can connect to the network by using public node?

so,I can learn to add other coins to my wallet, such as eos, zec .

[askucher]

It uses local HD node based on one secret phrase to generate an endless list of private keys and addresses

So you have a generated address and you can receive coins on that from other people

In the case when you want to check the balance you need to invoke getBalance method and provide your generated address

in the case when you have some coins you may want to send them somewhere so in this case you need to invoke sendTransaction

The answer is that the public node is used for cases when you need

1. Get Balance
2. Send Transaction
3. Get Transaction list

I tried to explain in README.md but now I understand that you need something like quick start example
If yes I can make it for you.

But if you want to work with it visually please download the wallet and play with it https://chrome.google.com/webstore/detail/ifagkkjladbaocinenklelnaailedikm

This wallet is based on this library

[itmsme]

sure, nice for you if you can make a quick start example

[askucher]

Has just uploaded an example + erc20 provider with this commit c0ed591

Sorry I am working in local git and have to push everything every day but do not follow this rule.

I use LiveScript language as the main language but it transforms in regular javascript with http://livescript.net/ or lsc -c file.ls

But this is just a bootstrap

var web3tBuilder = require('web3t');
var sparkle = require('./plugins/erc20-example.json');

module.exports  = {};

web3tBuilder({
  mode: 'testnet',
  plugins: {
     sparkle: sparkle
   }
}, function(err, web3t){
  if (err != null) {
    throw err;
  }
  Object.keys(web3t).forEach(function(key) {
        module.exports[key] = web3t[key];
   })
 
   //web3t.sparkle.getBalance({ address }, cb)
   //web3t.sparkle.sendTransaction(..., cb)
   //...
   //web3t.btc.sendTransaction(..., cb)
});

I am a functional developer so always do callback chain (because this is a functor). The functor is always the right way to do for all unexpected future complexities. That's why you see the builder as a functor.

[itmsme]

thanks a lot.
I am trying to learn it today, I think it should be well done by your help.

[itmsme]

In this quick start example, we can see that you have and 'sparkle' coin to web3t.
but I can not see any function about sparkle.

console.log(web3t); //web3t.sparkle.getBalance({ address }, cb)

so can you ? :(

[askucher]

This is a plug-in. It is not available by default. It available in the case when you pass the configuration of sparkle by following this pattern https://github.com/ethnamed/web3t/blob/master/examples/plugins/erc20-example.json. As fas as I know they still working on it. But you can use this example to add your own ERC20 coin