Cnlib

Library used by Coin Ninja for use in DropBit app for iOS and Android. This library uses gomobile to produce frameworks consumable by iOS and Android, respectively. Dependencies used can be seen in each file's import statements.

Getting Started

1. Clone the project
2. Ensure Go is installed (golang.org)
3. Use gomobile command relative to your needs

Prerequisites

What things you need to install the software and how to install them

• Go >= 1.13.4
• macOS >= 10.14 Mojave (if using macOS)

Running the tests

Run go test.

Usage

Here are general guidelines for using the library.

Wallet

The wallet will require a BaseCoin object, which dictates what type of wallet the client is concerned with (i.e. SegWit/BIP84, Script Nested Segwit/BIP49, mainnet, regtest, etc). From the BaseCoin, the wallet will generate the necessary child keys and associated bitcoin addresses.

Transactions

To create a transaction, use one of three available constructors:

• NewTransactionDataStandard
• NewTransactionDataFlatFee
• NewTransactionDataSendingMax

Each type provides functions to add UTXOs (AddUTXO(utxo *UTXO)) as well as subsequently generating the needed transaction information to be broadcasted (Generate()). Once initialized, iterate over all available UTXOs in your wallet and add them all to the transaction data object:

(pseudocode example)

for utxo in utxos {  
    data.AddUTXO(utxo)  
}  

err := data.Generate()

Once generated, the selected UTXOs needed to satisfy the amount + fee + change will be in an array called requiredUtxos. A client needing to get the required UTXO count selected for use in the transaction can call data.utxoCount().

A client is expected to broadcast the transaction on their own, so a function on the HDWallet type called BuildTransactionMetadata should be called with the transaction data's embedded TransactionData object, which will return the encoded transaction, associated txid, and any change information needed, if any.

Contributing

Please read CONTRIBUTING.md for our contribution policy.

Please read CODE_OF_CONDUCT.md for details on our code of conduct.

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

Authors

• BJ Miller - Initial work, client implementation considerations - Coin Ninja
• Zach Brown - Encryption/Decryption, CI/gomobile implementation, and consultation - Coin Ninja

License

This project is licensed under the MIT License - see the LICENSE.md file for details