Banani

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Banani is a library for the Banano cryptocurrency that will support sending, receiving, changing rep, RPC calls, message signing, wallet management, etc. It aims to be a more powerful and sensible version of @bananocoin/bananojs. Banani takes heavy inspiration from the Python bananopie (which I also wrote), which in turn takes some inspiration from my experiences with ethers.js.

Please report any bugs or request features by opening an Github issue. You can ask for help or ask questions in the #frankensteins-lab channel of the Banano discord and people will be typically be eager to assist if they can.

Installing

npm install banani
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Embedding in the browser is easy to - just download and add banani-browser.js to your website:

<script src="/path/to/banani-browser.js"></script>
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Take a look in browser_test/index.html for an example.

Documentation

The docs are hosted at https://banani.prussia.dev (can also be accessed at https://stjet.github.io/banani/).

Examples

Banani allows you to send, receive, and change representative. If you are using Banani on the web, replace banani with window.banani.

const rpc = new banani.RPC("https://kaliumapi.appditto.com/api");

console.log(await rpc.get_block_count());

const wallet = new banani.Wallet(rpc, process.env.seed);

const zero_index_address = wallet.address;

wallet.index = 1;

const send_hash = await wallet.send(zero_index_address, "1"); //send 1 banano

wallet.index = 0;

await wallet.receive(send_hash); //receive the bananos we just send (can also do `await wallet.receive_all()`)

await wallet.change_rep("placeholder");
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Banani also comes with some useful utilities, and message signing:

const rpc = new banani.RPC("https://kaliumapi.appditto.com/api");
const random_wallet = banani.Wallet.gen_random_wallet(rpc);

console.log(banani.whole_to_raw("4.20069") === 420069000000000000000000000000n);
console.log(random_wallet.sign_message("test message\ntest test"));
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Contributing

git clone https://github.com/stjet/banani.git
cd banani
...
<make your changes with your favourite editor>
...
npm run build
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Then commit and push your changes.

In most cases, you will only need to touch the typescript (.ts) files.

Work Generation

Though Kalium's public work will generate work for you, it is suggested that you generate your own work for the following reasons:

• it is relatively "easy" (in terms of computation) to do
• if Boompow goes offline (as it has done in the past), many Banano services will go down, which is not great for users and is not a very decentralized or resilient way to make your thing

Unrelated, do remember that Nano has harder work thresholds than Banano.

Using for Nano instead of Banano

The main differences between Nano and Banano; or at least those relevant to a library like this, are the different amount of decimals. So, when creating a Wallet with banani, make sure to do my_rpc.DECIMALS = 31 otherwise your sends will be off by two magnitudes which is bad.

Also, a different preamble should be used for message signing.

Dependencies

Banani has two external dependencies, tweetnacl and blake2b. Blake2b probably has its own dependencies, but I haven't checked.

Tweetnacl is not listed as a dependency in the package.json because it has been modified to use blake2b for the hashing algorithm. So, a modified version of it is distributed directly along with the package (see tweetnacl_mod.js). Clone the repo and run npm run cryptodiff to see the changes made from regular tweetnacl.

Banani also has many dev dependencies for contributing/developing the package (see the "Contributing" section), but they are not needed for regular users of the package.

Todo

• More extensive testing
• Example work generating function