Tiny bitcoin library, with lightweight client and utils.

This contains several pieces of interest:

• libccoin - C library for building bitcoin applications
• picocoin - (WIP) Bitcoin HD wallet
• brd - (WIP) Bitcoin network full node ("block relay daemon")
• Comprehensive test suite.

libccoin library dependencies: GMP

picocoin client dependencies: GMP libevent 2.x jansson 2.x (2.1 used for development)

block relay daemon (brd) dependencies: GMP libevent 2.x

The picocoin wallet is operated via command line, in a similar style to "git sub-command". To obtain a list of commands, run

$ ./picocoin --help

The program stores settings in a key/value map. These key=value parameters may be specified on the command line via --set, or in a configuration file. To view these settings, run

$ ./picocoin settings

Format: address SPACE port

Manually add P2P node to peer manager.

Specify a pathname to the configuration file.

Specify a pathname to the wallet data file. Default "picocoin.wallet"

AES encryption is applied to the wallet. Passphrase is specified via environment variable PICOCOIN_PASSPHRASE.

Enable additional debug output.

TCP connect(2) timeout.

Select blockchain and network. Reads the "chain" settings variable. Acceptable values are "chain=bitcoin" and "chain=testnet3". Updates internal parameters (pchMessageStart / network magic, genesis block, ...)

Query and display bitcoin DNS seeds, for P2P node addresses.

Display settings map.

Generate a new bitcoin address (ECDSA keypair). Store it in the current wallet,

Initialize a new wallet. Refuses to initialize, if the filename already exists.

Create new HD account.

Synchronize with network: send any pending payments, and check for new incoming payments.

List all legacy non-HD bitcoin addresses in wallet.

Dump entire wallet contents, including all private keys.

Informational summary of wallet data.