[ANNOUNCE] picocoin and libccoin -- C-based bitcoin library and client

[Aido]

Hi marcopal,

 Maybe this helps.......

Hi Jeff,

I'm trying to get my head around the brd.c code with a view to introducing LMDB to the picocoin project.

There's a few things I don't yet get. It seems that brd no longer stores blocks in brd.blkdb (it's commented out in code) but uses brd.blocks instead. But, there are still attempts to write to brd.blkdb, like calling blkdb_add(), which I think will always fail.

So, can the blkdb.c code be removed or does it just need a tidy-up?

blkdb is required and is always used.  It is the block header database.  It is kept in RAM, as bitcoind does.  It is optionally stored in a file, in addition to RAM.  It is optionally regenerated from the 17+GB blockchain file, if blkdb is missing

Actually, that reminds me. I never did have a go at adding LMDB to picocoin.

[marcopal]

thank you for the replay Aido,

I read that post but I thought it was related to the brd client that, if I understand, should be implementing a full node.
picocoin executable should be implementing the SPV node instead.
am I correct?
I will give a more deep read to the code..

[Aido]

Hi marcopal,

If you look at the code you will see that both the client (picocoin) and the block relay daemon (brd) both have a init_blkdb() function. This creates the emplty blkdb file.

brd also has a block_process() function which uses blkdb_add() for adding blocks to the file. This is what my query to Jeff was about in the previous post.

The client (picocoin) does not have a block_process() function so nothing more is done to the blkdb file after it is created.

[marcopal]

thank you Aido.

how much effort, in your opinion, will take to have a full featured SPV node and HD wallet starting from the picocoin code?
do you know about any other SPV implementations in pure C?

[marcus_of_augustus]

thank you Aido.

how much effort, in your opinion, will take to have a full featured SPV node and HD wallet starting from the picocoin code?
do you know about any other SPV implementations in pure C?

I don't think there are any SPV clients in pure C out there.

mSIGNA https://github.com/ciphrex/mSIGNA is a c++ SPV client that is feature-rich

[marcopal]

thank you marcus_of_augustus