Coindust is a command-line bitcoin wallet and utility.
Coindust performs common bitcoin operations where key storage is local (see Safety section below) and interacting with the bitcoin blockchain is done through public Bitcoin APIs.
In the early days of bitcoin (2013) it was common to host a full node. Today(2015) the requirements of running a full node and high - many hours of initial syncing and 10s of gigabytes of disk. Cell phone cryptocoin apps have shown keeping private keys local and using public APIs can be a great way to use Bitcoin.
$ npm install -g coindust
- Add a new bitcoin address and private key to the wallet using an optional account name.
$ coindust new comic books pub: 1FsS76LHrh8Fq4ee5NP9Df3e2vqf3nzmDj priv: L3YfxDBDrYAXL7U7eFWaxTejheCG3Cf7MKGRjUjXRgEZDF5h3c4X name: "comic books"
- Query the balances of addresses in the wallet 
$ coindust balance gathering balances for 2 keys 1AVrK8LZeKxvnrT3AiyZ3uvceYTdNyNELf 0.03000000 BTC 1FsS76LHrh8Fq4ee5NP9Df3e2vqf3nzmDj 0.00000000 BTC "comic books" Total: 0.03000 BTC
- Query the balance of a single bitcoin address 
$ coindust 1AVrK8LZeKxvnrT3AiyZ3uvceYTdNyNELf gathering balances for 1 keys 1AVrK8LZeKxvnrT3AiyZ3uvceYTdNyNELf 0.00000000 BTC Total: 0 BTC
- Build a transaction between two bitcoin addresses 
Note: this builds the transaction and displays it in hex form. It does not submit the transaction.
$ coindust tx --in 1Q182Kx8y7gkXvvEod8nwt5gDDa86Dr2tv --out 1MXEaXamNSLUXQKWZu8fSz241Zginvoj1m --amount 0.0008 coindust v0.4.0 using 21co recommended fee rate of 220 satoshis/byte input: 1Q182Kx8y7gkXvvEod8nwt5gDDa86Dr2tv 0.00082210btc (1 of 3 unspents) 1Q182Kx8y7gkXvvEod8nwt5gDDa86Dr2tv 0.04813173btc (2 of 3 unspents) output: 1MXEaXamNSLUXQKWZu8fSz241Zginvoj1m 0.00080000btc 1Q182Kx8y7gkXvvEod8nwt5gDDa86Dr2tv 0.04733323btc (change) fee total: 0.00082060btc tx size: 372 bytes fee rate: 221 satoshis/byte Hex encoded transaction: 0100000001a30b283b7ffe227f0e008f2f0ec024edbc7a988b44983ec79e9ba49334dea265d0e976502207e0dc9a53d4be...
The hex form of the transaction can be pasted it into a blockchain service which will submit the transaction into the bitcoin network. Decode and inspect the transaction to verify its correctness. 
 Uses blockexplorer.com to get a balance from a bitcoin address.
 Uses blockchain.info to discover the 'unspent outputs' of the 'in' address.
 Uses 21.co for a recommened fee rate
 for example https://live.blockcypher.com/bcy/decodetx/
- Use tx --sweep to empty the address (sets amount to address total after fee)
$ coindust tx --in 1Q182Kx8y7gkXvvEod8nwt5gDDa86Dr2tv --out 1MXEaXamNSLUXQKWZu8fSz241Zginvoj1m --sweep
Bitcoin addresses and private keys are kept unencrypted in ~/.config/coindust/wallet.json. Protect this file with your own mechanism for encryption and backups.
Building transactions with this tool is not exhaustively tested. Use only small amounts. NO WARRANTY. USE AT OWN RISK.