Topic: Electrum for Templecoin (Read 1540 times)

ok I finally figure 2 things:


1. there so many SCAM on the freelancer. if don't post a good amount of offer, I guess all of SCAM.


2. I finally figure the solution myself. and have upload to github. if anyone interesting. other VertCoin implementation. I use a pretty silly way.
directly porting C++ to python, with similar variables. easy to understand, but not optimized yet.

https://github.com/9cat/electrum-tpc/blob/kgw/lib/blockchain.py#L300

I guess it kind out of ability to finish all the coding.

Wish someone able to do it with a small cash as the following link:
https://www.freelancer.com/projects/Linux-Python/Implement-electrum-wallet-for-Templecoin.html


If someone could do the best job with lower bid.
I would offer additional TPC$200 as bounty for this job done.


-Temple

I tried to make it working at least.

But may I know the SPV , is it stands for simple payment verfication?
If I block those part. what's the major impact for it?

double spending?
or attacking?

BTW, your "security hole" is basically disabling SPV completely.

I've previously got KGW working with vertcoin, but it's quite slow due to the way KGW works (perhaps someone else could figure out how to speed up the code).

See here: https://github.com/wozz/electrum-vert/blob/master/lib/blockchain.py#L284

I assume you'll need to modify quite a bit of code to get this working correctly.

I finally got it work with security hole there.might need to dig into it. but might help someone else like to play around it.


I don't know how to implement the KGW (KimotoGravityWell)
for electrum:

https://github.com/9cat/templecoin/blob/templecoin/src/main.cpp#L1306

So I simply avoid to check bit for now.
If anyone know how to implement the KGW part. I love to see if . and I will off TPC100 bounty for it


----------------------------------------------------------------

 def verify_chain(self, chain):

        first_header = chain[0]
        prev_header = self.read_header(first_header.get('block_height') -1)
       
        for header in chain:

            height = header.get('block_height')

            prev_hash = self.hash_header(prev_header)
            bits, target = self.get_target(height/2016, chain)
            _hash = self.pow_hash_header(header)
         
         
            print_msg("prev_hash", prev_hash)
            print_msg("prev_block_hash", header.get('prev_block_hash'))
            print_msg("bits", bits)
            print_msg("bits.header", header.get('bits'))

            try:
                assert prev_hash == header.get('prev_block_hash')
                #assert bits == header.get('bits')
                #assert int('0x'+_hash,16) < target
            except Exception:
                return False

            prev_header = header

        return True

OK, I guess I got the blockchain_headers.

It is under the levelDB.

And when I change that url above. it verified the previous payments. However, I can't see the blockchain is increasing when the time goes.

Thanks your reply.
I modify a little bit for the bitcoin.
It is megacoin + litecoin + own modification of getblock value;
However, I did not change a lot .

I try to spend some time to dig into this block chain part.

PS: there is a code:
 self.headers_url = 'http://headers.electrum-ltc.org/blockchain_headers'

How can I made this headers for my own coin? if anyone know, reply this too.
https://github.com/9cat/electrum-tpc/blob/templecoin/lib/blockchain.py#L41

I would start here: https://github.com/9cat/electrum-tpc/blob/templecoin/lib/blockchain.py#L253

You left everything the same as Litecoin.  I know nothing about templecoin, but I assume it's not a complete clone of Litecoin.

I currently study the code for electrum client and server. They are nice.
However, when I try to port it to my own coin , Templecoin, I encounter some problem.

I don't know if that the right place to ask.

The source code is here:
https://github.com/9cat/electrum-tpc


It is running fine, and can receive coins and send coins.
But it is not able to verify coins.

The worst is that I don't know if it is a server side issue for the client issue.
And I am doing poor at python coding.

If anyone can help on this I could reward ₮100 as a bounty (electrum running successfully and fully functioning, same as bitcoin for the current version)

If you don't have time, please point me out which .py file I should modify to fix this verification issue.