@orbinum/protocol

The public TypeScript SDK for Orbinum — chain access, address handling, encoding, note types, and the payment slip a dapp hands a wallet.

It holds no keys. Nothing here derives or handles a spending key. A dapp, a script or an automation talks to the chain and asks an Orbinum wallet to pay; the wallet owns the custody. A package anyone can install is the wrong place for a spending key, so the code that touches one is not in this package at all — it lives in the wallet, behind the wallet's own trust boundary.

Environment-agnostic: a browser tab, an extension service worker, React Native, Node and Cloudflare Workers all run it.

Installation

npm install @orbinum/protocol
# peer deps, if you talk to a Substrate node:
npm install polkadot-api @polkadot/util-crypto

What it gives you

foundation/  encoding, addresses, balance formatting, low-level crypto
protocol/    note types, the encrypted memo, the payment slip, tree geometry
chain/       OrbinumClient — Substrate + EVM, RPC, the shielded-pool pallet

Quick start

Talk to a node

import { OrbinumClient } from '@orbinum/protocol';

const client = await OrbinumClient.connect({
  substrateWs: 'ws://localhost:9944',
  evmRpc: 'http://localhost:9933',
});

const stats = await client.privacy.getPoolStats();
console.log('root:', stats.merkleRoot, 'leaves:', stats.commitmentCount);

client.destroy();

Addresses

import {
  isSubstrateAddress,
  isEvmAddress,
  evmToSubstrate,
  formatBalance,
} from '@orbinum/protocol';

isEvmAddress('0xabc…');            // → boolean
evmToSubstrate('0xabc…');          // → SS58 string
formatBalance(1_000_000_000_000n); // → human-readable

Hand a wallet a payment slip

A payment slip carries only what is already public on chain — a note's commitment, its encrypted memo, and its leaf index — sealed toward the recipient's privacy address. It grants no spend power: the recipient opens it with their own viewing key. It is how a dapp tells a wallet "here is a payment for you" without either side scanning the pool.

import { sealPaymentSlip, encodePaymentSlip } from '@orbinum/protocol';

// The recipient's packed viewing public key comes first — it is what the slip
// is sealed toward.
const envelope = sealPaymentSlip(recipientIvkPacked, fields);
const wire = encodePaymentSlip(envelope); // → 'orbslip1:…' — hand this to the wallet

Forest geometry

import { isValidLeafIndex, treeIdOf, LEAVES_PER_TREE } from '@orbinum/protocol';

isValidLeafIndex(leafIndex);   // a leaf index from an untrusted source is real?
treeIdOf({ leafIndex });       // which forest tree that leaf lives in

The custody boundary

This SDK is deliberately incomplete: it cannot build, open, or spend a note, because doing so needs a spending key. Those operations — key derivation, the vault, note construction, rescan, witness assembly and proving — live in the Orbinum wallet, not here. If you are writing a dapp or a script, you compose a payment (a slip, an address, an amount) with this SDK and route the spend through a wallet.

A sovereign program that custodies its own seed is a wallet, not a consumer of this SDK, and belongs on the wallet's side of that line.

Entry points

Import	What it is
@orbinum/protocol	Everything above — the single public surface

Requirements

• Node 22+, or any modern browser / RN runtime.
• To reach a Substrate node: polkadot-api and @polkadot/util-crypto (peers).

License

MIT