Bitcoinj for PoS?

[EcuaMobi]

I'm trying to create a fork of BitcoinJ for PoS coins.

I have experience on Java and Android, but I have less knowledge on PoS than I'd like.

I've successfully connected to a PoS network and I'm receiving the blocks. However, I'm not able to decode the responses.

Can somebody with experience on PoS list the main difference between PoW (ex: Bitcoin) and PoS (ex: Peercoin) protocol-wise?
What should I check to be able to understand how to connect and read the response?

Any help is appreciated.

[elbandi]

If i good remember, transacion has a new field (nTime):
https://github.com/ppcoin/ppcoin/blob/master/src/main.h#L451

and block has a vchBlockSig field:
https://github.com/ppcoin/ppcoin/blob/master/src/main.h#L922

[ChuckOne]

I'm trying to create a fork of BitcoinJ for PoS coins.

I have experience on Java and Android, but I have less knowledge on PoS than I'd like.

I've successfully connected to a PoS network and I'm receiving the blocks. However, I'm not able to decode the responses.

Can somebody with experience on PoS list the main difference between PoW (ex: Bitcoin) and PoS (ex: Peercoin) protocol-wise?
What should I check to be able to understand how to connect and read the response?

Any help is appreciated.

If you know Java well, clone Nxt.

[EcuaMobi]

If i good remember, transacion has a new field (nTime):
https://github.com/ppcoin/ppcoin/blob/master/src/main.h#L451

and block has a vchBlockSig field:
https://github.com/ppcoin/ppcoin/blob/master/src/main.h#L922

Thank's for the info. I'm checking that out.

If you know Java well, clone Nxt.

Thanks for the tip. However, I see this Nxt Android Wallet is just a very light client with no real connection to the network.
Is there any other Android client or Nxt-J implementation?

I want to fork BitcoinJ to be able to create wallets similar to Andrea's.

[bitgold]

I'm trying to create a fork of BitcoinJ for PoS coins.

I have experience on Java and Android, but I have less knowledge on PoS than I'd like.

I've successfully connected to a PoS network and I'm receiving the blocks. However, I'm not able to decode the responses.

Can somebody with experience on PoS list the main difference between PoW (ex: Bitcoin) and PoS (ex: Peercoin) protocol-wise?
What should I check to be able to understand how to connect and read the response?

Any help is appreciated.

If you know Java well, clone Nxt.

Aren't there many NXT clones already?
Besides, is NXT really open source? Last time I heard, their "open source" code is a few releases behind.

[ChuckOne]

Thanks for the tip. However, I see this Nxt Android Wallet is just a very light client with no real connection to the network.
Is there any other Android client or Nxt-J implementation?

I want to fork BitcoinJ to be able to create wallets similar to Andrea's.

That is the source. It includes a Web-Client: https://bitbucket.org/JeanLucPicard/nxt/overview

That is the Web-Client as a one-click-installer: http://nxtra.org/nxt-wallet/

That does fit your description of Nxt-J?

[ChuckOne]

Aren't there many NXT clones already?
Besides, is NXT really open source? Last time I heard, their "open source" code is a few releases behind.

As far as I get it, he want to create a new sort of client/library for PoS coins. That would be coin agnostic.

[Stouse49]

Do a search for peercoin Android Wallet.  Others have worked on this problem.

Some have found that it would not be possible to implement an SPV client for any PoS coin.  Why?

Because to verify a block header, one needs to coinbase transaction to determine if the block is a PoW block or a PoS block.  That requires more information than what is in the block header.

[ChuckOne]

Do a search for peercoin Android Wallet.  Others have worked on this problem.

Some have found that it would not be possible to implement an SPV client for any PoS coin.  Why?

Because to verify a block header, one needs to coinbase transaction to determine if the block is a PoW block or a PoS block.  That requires more information than what is in the block header.

Exactly. In PoS, you need the effective balances at block X to verify the block generator. These balances you get only by scanning the complete blockchain OR trusting somebody giving them to you. So, SPV in PoS not possible AFAIK.

But Nxt will use other means of achieving SPV.