@orbinum/sdk

Official TypeScript SDK for Orbinum — a privacy-focused blockchain built on Substrate with an EVM compatibility layer.

The SDK provides typed modules for interacting with the Orbinum protocol: Substrate RPC, EVM JSON-RPC, shielded pool operations, account identity and mapping, rpc-v2, ZK verifier, precompiles, and the indexer REST API.

Installation

npm install @orbinum/sdk
# or
pnpm add @orbinum/sdk

Requirements

Node.js 18 or later
A running Orbinum node (Substrate WebSocket endpoint)
An EVM JSON-RPC endpoint (optional, required for EVM and precompile operations)

Quick Start

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

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

const chainInfo = await client.substrate.getChainInfo();
const root = await client.rpcV2.privacy.getMerkleRoot();
const events = await client.substrate.queryBlockEvents('0xabc...');

OrbinumClient wires together the SDK surface under a single interface.

client.substrate: Substrate WebSocket RPC, block queries, event decoding, and transaction helpers
client.evm: EVM JSON-RPC client, or null if evmRpc was not configured
client.rpcV2: typed Orbinum rpc-v2 namespaces
client.shieldedPool: shielded-pool extrinsics and note helpers
client.accountMapping: alias, chain-link, metadata, and marketplace operations
client.precompiles: EVM precompile wrappers, or null if evmRpc was not configured

Each module can also be instantiated independently.

OrbinumClientProvider

OrbinumClientProvider wraps OrbinumClient with automatic WebSocket reconnection, typed connection status events, and a React-friendly lifecycle.

import { OrbinumClientProvider } from '@orbinum/sdk';

const provider = new OrbinumClientProvider({
    substrateWs: 'ws://localhost:9944',
    evmRpc: 'http://localhost:9933',
});

provider.on('statusChange', (event) => {
    console.log(event.status); // 'connecting' | 'connected' | 'disconnected' | 'error'
});

await provider.connect();
const client = provider.client; // OrbinumClient once connected

rpc-v2

Orbinum's rpc-v2 is organized by namespace.

Standard Frontier namespaces: eth_*, net_*, web3_*, txpool_*, debug_*
Orbinum-specific namespace: privacy_*

In the SDK, rpc-v2 is modeled as a dedicated top-level module, exposed through client.rpcV2. Each namespace lives under src/rpc-v2/.

Current typed coverage:

client.rpcV2.privacy.getMerkleRoot()
client.rpcV2.privacy.getMerkleProof(leafIndex)
client.rpcV2.privacy.getNullifierStatus(nullifier)
client.rpcV2.privacy.getPoolStats()

Example:

const root = await client.rpcV2.privacy.getMerkleRoot();

const proof = await client.rpcV2.privacy.getMerkleProof(12);
// { path: string[]; leafIndex: number; treeDepth: number; }

const status = await client.rpcV2.privacy.getNullifierStatus('0x...');
// { nullifier: string; isSpent: boolean; }

const stats = await client.rpcV2.privacy.getPoolStats();
// { merkleRoot: string; commitmentCount: number; totalBalance: string; ... }

Notes:

rpc-v2 responses use snake_case from the node; the SDK normalizes them to camelCase.
u128 values are exposed as decimal strings to avoid precision loss.

Modules

SubstrateClient

Thin wrapper over polkadot-api (PAPI) for Substrate WebSocket communication.

import { SubstrateClient } from '@orbinum/sdk';

const substrate = await SubstrateClient.connect('ws://localhost:9944');

const info    = await substrate.getChainInfo();
const health  = await substrate.getHealth();
const version = await substrate.getNodeVersion();
const genesis = await substrate.getGenesisHash();

// Block queries
const header = await substrate.getBlockHeader('best');
const hash   = await substrate.getBlockHash(1000);
const block  = await substrate.getBlock('0xabc...');

// Block events — decoded into EventRecord[]
const events = await substrate.queryBlockEvents('0xabc...');

// Block stream
substrate.blocks$.subscribe(block => console.log(block.number));

// Raw JSON-RPC call
const result = await substrate.request('system_name', []);

// Transaction helpers
const tx        = await substrate.txFromCallData(callBytes);
const finalized = await tx.signAndSubmit(signer);
const finalized2 = await substrate.submit(signedHex);
substrate.submitAndWatch(signedHex).subscribe(event => console.log(event));

EvmClient

Stateless HTTP client following the Ethereum JSON-RPC specification.

import { EvmClient } from '@orbinum/sdk';

const evm = new EvmClient('http://localhost:9933');

const balance = await evm.getBalance('0xYourAddress');
const chainId = await evm.getChainId();
const txHash  = await evm.sendRawTransaction(signedHex);

// Batch multiple calls in a single HTTP request
const [bal, nonce] = await evm.batchRequest([
    { method: 'eth_getBalance',          params: ['0xAddr', 'latest'] },
    { method: 'eth_getTransactionCount', params: ['0xAddr', 'latest'] },
]);

EvmExplorer

Read-only EVM block and transaction explorer.

import { EvmExplorer } from '@orbinum/sdk';

const explorer = new EvmExplorer('http://localhost:9933');

const block = await explorer.getBlock(12345);
const tx    = await explorer.getTransaction('0xhash...');
const logs  = await explorer.getLogs({ fromBlock: 100, toBlock: 200, address: '0x...' });

Types: EvmBlock, EvmTransaction, EvmAddressInfo, EvmTxSummary, EvmLog, TokenInfo, TokenTransfer.

ZkVerifierModule

Typed access to the on-chain ZK verifier — circuit version info, VK hashes, and version history.

import { ZkVerifierModule } from '@orbinum/sdk';

const zkv = new ZkVerifierModule(substrate);

const info    = await zkv.getCircuitVersionInfo('circuit-id');
const vkHash  = await zkv.getVkHash('circuit-id', 1);
const stats   = await zkv.getVersionStats('circuit-id');
const history = await zkv.getHistoricalVersions('circuit-id');

ShieldedPoolModule

High-level interface for shielded pool extrinsics and note workflows. Requires a loaded PrivacyKeyManager and ZK proofs for unshield and private transfer.

// Shield (deposit) tokens into the shielded pool
const { txResult, note } = await client.shieldedPool.buildAndShield({
    amount: 1_000_000n,
    assetId: 1,
    tokenAddress: '0xTokenAddress',
}, signer);

// Private transfer between notes
await client.shieldedPool.privateTransfer({ ...params }, signer);

// Unshield (withdraw) tokens to a public address
await client.shieldedPool.unshield({ ...params }, signer);

PrivacyModule (`rpc-v2`)

Typed wrapper for Orbinum privacy_* endpoints from rpc-v2.

import { PrivacyModule } from '@orbinum/sdk';

const privacy = new PrivacyModule(substrate);

const merkleRoot  = await privacy.getMerkleRoot();
const merkleProof = await privacy.getMerkleProof(4);
const nullifier   = await privacy.getNullifierStatus('0xNullifier');
const stats       = await privacy.getPoolStats();

Privacy Keys

Key derivation follows a deterministic chain from the user's wallet signature. No key material is ever stored by the SDK.

import {
    PrivacyKeyManager,
    deriveOwnerPk,
    deriveSpendingKeyFromSignature,
    deriveSpendingKeyMessage,
    deriveViewingKey,
} from '@orbinum/sdk';

const message    = deriveSpendingKeyMessage(chainId, evmAddress);
const spendingKey = deriveSpendingKeyFromSignature(sigHex, chainId, evmAddress);

const keyManager = new PrivacyKeyManager();
keyManager.load(spendingKey);

const viewingKey = deriveViewingKey(spendingKey);
const ownerPk    = deriveOwnerPk(spendingKey);

AccountMappingModule

Manage on-chain identity by linking Substrate and EVM accounts, registering aliases, and interacting with the alias marketplace.

await client.accountMapping.registerAlias({ alias: 'myalias' }, signer);
await client.accountMapping.addChainLink({ chainId: 1, address: '0xEvmAddr' }, signer);

const alias  = await client.accountMapping.getAliasOf(substrateHex);
const linked = await client.accountMapping.getChainLinks(substrateHex);

IndexerClient

HTTP client for the Orbinum indexer REST API. All list endpoints are paginated.

import { IndexerClient } from '@orbinum/sdk';

const indexer = new IndexerClient({ baseUrl: 'https://indexer.orbinum.io' });

const blocks      = await indexer.getBlocks({ page: 1, limit: 20 });
const extrinsics  = await indexer.getExtrinsics({ address: '5F...' });
const commitments = await indexer.getCommitments({ page: 1, limit: 20 });
const nullifier   = await indexer.getNullifierStatus('0xNullifier');
const roots       = await indexer.getMerkleRoots({ limit: 10 });
const evmTxs      = await indexer.getEvmTransactions({ address: '0xabc...' });
const stats       = await indexer.getStats();

Precompiles

Typed wrappers for Orbinum's EVM precompile contracts.

Precompile	Address	Description
`ShieldedPoolPrecompile`	`0x0801`	Shield, unshield, and private transfer from EVM
`AccountMappingPrecompile`	`0x0800`	Identity and alias operations from EVM
`CryptoPrecompiles`	`0x0400–0x0403`	Frontier crypto utilities

import { ShieldedPoolPrecompile, decodePrecompileCalldata } from '@orbinum/sdk';

const precompile = new ShieldedPoolPrecompile(evmClient);
await precompile.shield(amount, tokenAddress, commitment, walletSigner);

// Decode raw EVM calldata for a known precompile
const decoded = decodePrecompileCalldata('0x0800', calldata);

Extrinsic & Event Decoders

The mapExtrinsicArgs and mapZkEventData helpers decode raw pallet call data from the indexer or block scanner into typed objects.

import { mapExtrinsicArgs, mapZkEventData } from '@orbinum/sdk';

const decoded = mapExtrinsicArgs('shieldedPool', 'shield', rawArgs);
// DecodedShieldArgs | DecodedUnshieldArgs | ...

const eventData = mapZkEventData('ProofVerified', rawEventData);

Substrate SCALE Primitives

SCALE codec primitives from @polkadot-api/substrate-bindings are re-exported directly from the SDK. There is no need to install that package separately.

import { Blake2256, AccountId, u128, u64, Storage, Keccak256 } from '@orbinum/sdk';
import { base58, getSs58AddressInfo } from '@orbinum/sdk';

Key Derivation Chain

wallet.sign(message)
        |
        v
deriveSpendingKeyFromSignature()   -- HKDF-SHA256 over signature bytes, mod BN254_R
        |
        +-- deriveViewingKey()     -- HKDF-SHA256 -> 32-byte ChaCha20 symmetric key
        |                             (used to encrypt/decrypt note memos)
        |
        +-- deriveOwnerPk()        -- BabyJubJub scalar multiplication -> Ax
                                      (embedded in shielded note commitments)

Development

Typing Layout

The SDK organizes types by feature ownership.

types/index.ts: public shared types of the feature
types/pallet-events.ts: event payloads and discriminated unions for that pallet
types/pallet-extrinsics.ts: extrinsic argument types and call unions for that pallet
types/raw.ts: internal node or RPC response shapes used only for transport mapping

Examples:

src/shielded-pool/types/index.ts
src/shielded-pool/types/pallet-events.ts
src/shielded-pool/types/pallet-extrinsics.ts
src/rpc-v2/types/raw.ts
src/indexer/types/index.ts
src/account-mapping/types/index.ts

Rules:

If a type is part of the public API of a feature, keep it in that feature's types/index.ts.
If a type only mirrors a transport payload from RPC, keep it in types/raw.ts.
Do not reintroduce a global src/types.ts or src/types/ directory.
Export public types from src/index.ts, but keep ownership at the feature level.

Extending `rpc-v2`

The intended extension pattern is namespace-oriented and centralized under RpcV2Module.

For example, to add net_* support:

Create src/rpc-v2/NetModule.ts
Define raw response types that match the node's JSON exactly
Map raw snake_case or hex-shaped values into stable SDK-facing TypeScript types
Export the module from src/rpc-v2/index.ts
Attach it in RpcV2Module, for example as client.rpcV2.net
Add unit tests that verify RPC method names, params, and response mapping

export class NetModule {
    constructor(private readonly substrate: SubstrateClient) {}

    async version(): Promise<string> {
        return this.substrate.request<string>('net_version', []);
    }
}

Commands

pnpm install
pnpm build          # compile to dist/ (ESM + CJS + types)
pnpm test           # run test suite (769 tests)
pnpm typecheck:all  # typecheck src and tests
pnpm lint           # eslint
pnpm format         # prettier

License

ISC

Installation

npm install @orbinum/sdk
# or
pnpm add @orbinum/sdk

Requirements

Node.js 18 or later
A running Orbinum node (Substrate WebSocket endpoint)
An EVM JSON-RPC endpoint (optional, required for EVM and precompile operations)

Quick Start

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

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

const chainInfo = await client.substrate.getChainInfo();
const root = await client.rpcV2.privacy.getMerkleRoot();
const tree = await client.shieldedPool.merkle.getTreeInfo();

OrbinumClient wires together the current SDK surface under a single interface.

client.substrate: Substrate WebSocket RPC and transaction helpers
client.evm: EVM JSON-RPC client, or null if evmRpc was not configured
client.rpcV2: typed Orbinum rpc-v2 namespaces
client.shieldedPool: shielded-pool extrinsics, note helpers, and Merkle queries
client.accountMapping: alias, chain-link, metadata, and marketplace operations
client.precompiles: EVM precompile wrappers, or null if evmRpc was not configured

Each module can also be instantiated independently.

rpc-v2

Orbinum's rpc-v2 is organized by namespace.

Standard Frontier namespaces: eth_*, net_*, web3_*, txpool_*, debug_*
Orbinum-specific namespace: privacy_*

In the SDK, rpc-v2 is modeled as a dedicated top-level module, exposed through client.rpcV2. Each namespace lives under src/rpc-v2/ and is grouped there instead of being mixed into legacy protocol modules.

Current typed coverage:

client.rpcV2.privacy.getMerkleRoot()
client.rpcV2.privacy.getMerkleProof(leafIndex)
client.rpcV2.privacy.getNullifierStatus(nullifier)
client.rpcV2.privacy.getPoolStats()

Example:

const root = await client.rpcV2.privacy.getMerkleRoot();

const proof = await client.rpcV2.privacy.getMerkleProof(12);
// {
//   path: string[];
//   leafIndex: number;
//   treeDepth: number;
// }

const status = await client.rpcV2.privacy.getNullifierStatus('0x...');
// {
//   nullifier: string;
//   isSpent: boolean;
// }

const stats = await client.rpcV2.privacy.getPoolStats();
// {
//   merkleRoot: string;
//   commitmentCount: number;
//   totalBalance: string;
//   assetBalances: { assetId: number; balance: string }[];
//   treeDepth: number;
// }

Notes:

rpc-v2 responses from the node use snake_case; the SDK maps them to camelCase.
u128 values are exposed as decimal strings to avoid precision loss in JavaScript.
Privacy queries belong to client.rpcV2.privacy.*; they are no longer described as part of ShieldedPoolModule.

Modules

SubstrateClient

Thin wrapper over polkadot-api (PAPI) for Substrate WebSocket communication.

import { SubstrateClient } from '@orbinum/sdk';

const substrate = await SubstrateClient.connect('ws://localhost:9944');

const info = await substrate.getChainInfo();
const health = await substrate.getHealth();
const version = await substrate.getNodeVersion();
const genesis = await substrate.getGenesisHash();

// Raw JSON-RPC call
const result = await substrate.request('system_name', []);

// Build a transaction from pre-encoded SCALE call bytes
const tx = await substrate.txFromCallData(callBytes);
const finalized = await tx.signAndSubmit(signer);

// Submit a pre-signed extrinsic
const finalized = await substrate.submit(signedHex);

// Submit and observe lifecycle events
substrate.submitAndWatch(signedHex).subscribe(event => console.log(event));

EvmClient

Stateless HTTP client following the Ethereum JSON-RPC specification.

import { EvmClient } from '@orbinum/sdk';

const evm = new EvmClient('http://localhost:9933');

const balance = await evm.getBalance('0xYourAddress');
const chainId = await evm.getChainId();
const txHash = await evm.sendRawTransaction(signedHex);

// Batch multiple calls in a single HTTP request
const [balance, nonce] = await evm.batchRequest([
    { method: 'eth_getBalance', params: ['0xAddr', 'latest'] },
    { method: 'eth_getTransactionCount', params: ['0xAddr', 'latest'] },
]);

RpcV2Module

Top-level typed entry point for Orbinum rpc-v2 namespaces.

const root = await client.rpcV2.privacy.getMerkleRoot();
const proof = await client.rpcV2.privacy.getMerkleProof(4);
const nullifier = await client.rpcV2.privacy.getNullifierStatus('0xNullifier');
const stats = await client.rpcV2.privacy.getPoolStats();

ShieldedPoolModule

High-level interface for shielded pool extrinsics and note workflows. Requires a loaded PrivacyKeyManager and ZK proofs for unshield and private transfer.

// Shield (deposit) tokens into the shielded pool
const { txResult, note } = await client.shieldedPool.buildAndShield({
    amount: 1_000_000n,
    assetId: 1,
    tokenAddress: '0xTokenAddress',
}, signer);

const treeInfo = await client.shieldedPool.merkle.getTreeInfo();

// Private transfer between notes
await client.shieldedPool.privateTransfer({ ...params }, signer);

// Unshield (withdraw) tokens to a public address
await client.shieldedPool.unshield({ ...params }, signer);

PrivacyModule (`rpc-v2`)

Typed wrapper for Orbinum privacy_* endpoints from rpc-v2.

import { PrivacyModule } from '@orbinum/sdk';

const privacy = new PrivacyModule(client.substrate);

const merkleRoot = await privacy.getMerkleRoot();
const merkleProof = await privacy.getMerkleProof(4);
const nullifier = await privacy.getNullifierStatus('0xNullifier');
const stats = await privacy.getPoolStats();

Privacy Keys

Key derivation follows a deterministic chain from the user's wallet signature. No key material is ever stored by the SDK.

import {
    PrivacyKeyManager,
    deriveOwnerPk,
    deriveSpendingKeyFromSignature,
    deriveSpendingKeyMessage,
    deriveViewingKey,
} from '@orbinum/sdk';

// 1. Get the message the user must sign
const message = deriveSpendingKeyMessage(chainId, evmAddress);

// 2. Derive the spending key from the wallet signature
const spendingKey = deriveSpendingKeyFromSignature(sigHex, chainId, evmAddress);

// 3. Load into the key manager
const keyManager = new PrivacyKeyManager();
keyManager.load(spendingKey);

// The manager derives the viewing key (ChaCha20 memo decryption)
// and owner public key (BabyJubJub, used in note commitments)
const viewingKey = deriveViewingKey(spendingKey);
const ownerPk = deriveOwnerPk(spendingKey);

AccountMappingModule

Manage on-chain identity by linking Substrate and EVM accounts, registering aliases, and interacting with the alias marketplace.

// Register an alias
await client.accountMapping.registerAlias({ alias: 'myalias' }, signer);

// Link an EVM address to a Substrate account
await client.accountMapping.addChainLink({ chainId: 1, address: '0xEvmAddr' }, signer);

// Query
const alias = await client.accountMapping.getAliasOf(substrateHex);
const linked = await client.accountMapping.getChainLinks(substrateHex);

IndexerClient

HTTP client for the Orbinum indexer REST API. The indexer runs as a separate service indexed from node events.

import { IndexerClient } from '@orbinum/sdk';

const indexer = new IndexerClient({
    baseUrl: 'https://indexer.orbinum.io',
});

const commitments = await indexer.getCommitments({ page: 1, limit: 20 });
const status      = await indexer.getNullifierStatus('0xNullifier');
const roots       = await indexer.getMerkleRoots({ limit: 10 });
const extrinsics  = await indexer.getAddressExtrinsics('5F...');
const evmTxs      = await indexer.getEvmTransactions({ address: '0xabc...' });

Precompiles

Typed wrappers for Orbinum's EVM precompile contracts, callable from any EVM wallet or signer.

Precompile	Address	Description
`ShieldedPoolPrecompile`	`0x0801`	Shield, unshield, and private transfer from EVM
`AccountMappingPrecompile`	`0x0800`	Identity and alias operations from EVM
`CryptoPrecompiles`	`0x0400–0x0403`	Frontier crypto utilities (SHA3, EC recover, Curve25519)

import { ShieldedPoolPrecompile } from '@orbinum/sdk';

const precompile = new ShieldedPoolPrecompile(evmClient);
await precompile.shield(amount, tokenAddress, commitment, walletSigner);

Key Derivation Chain

wallet.sign(message)
        |
        v
deriveSpendingKeyFromSignature()   -- HKDF-SHA256 over signature bytes, mod BN254_R
        |
        +-- deriveViewingKey()     -- HKDF-SHA256 -> 32-byte ChaCha20 symmetric key
        |                             (used to encrypt/decrypt note memos)
        |
        +-- deriveOwnerPk()        -- BabyJubJub scalar multiplication -> Ax
                                      (embedded in shielded note commitments)

Development

Typing Layout

The SDK organizes types by feature ownership.

types/index.ts: public shared types of the feature
types/pallet-events.ts: event payloads and discriminated unions for that pallet
types/pallet-extrinsics.ts: extrinsic argument types and call unions for that pallet
types/raw.ts: internal node or RPC response shapes used only for transport mapping

Examples:

src/shielded-pool/types/index.ts
src/shielded-pool/types/pallet-events.ts
src/shielded-pool/types/pallet-extrinsics.ts
src/rpc-v2/types/raw.ts
src/indexer/types/index.ts
src/precompiles/types/index.ts

Rules:

If a type is part of the public API of a feature, keep it in that feature's types/index.ts.
If a type only mirrors a transport payload from RPC, keep it in types/raw.ts.
Do not reintroduce a global src/types.ts or src/types/ directory.
Export public types from src/index.ts, but keep ownership at the feature level.

Extending `rpc-v2`

The intended extension pattern is namespace-oriented and centralized under RpcV2Module.

For example, to add net_* support:

Create src/rpc-v2/NetModule.ts
Define raw response types that match the node's JSON exactly
Map raw snake_case or hex-shaped values into stable SDK-facing TypeScript types
Export the module from src/rpc-v2/index.ts
Attach it in RpcV2Module, for example as client.rpcV2.net
Add unit tests that verify RPC method names, params, and response mapping

Minimal shape example:

export class NetModule {
    constructor(private readonly substrate: SubstrateClient) {}

    async version(): Promise<string> {
        return this.substrate.request<string>('net_version', []);
    }

    async peerCount(): Promise<string> {
        return this.substrate.request<string>('net_peerCount', []);
    }

    async listening(): Promise<boolean> {
        return this.substrate.request<boolean>('net_listening', []);
    }
}

The same approach applies to web3_*, txpool_*, eth_*, and any future Orbinum-specific namespaces.

pnpm install
pnpm build          # compile to dist/ (ESM + CJS + types)
pnpm test           # run test suite
pnpm typecheck:all  # typecheck src and tests
pnpm lint           # eslint
pnpm format         # prettier

License

ISC

Name		Name	Last commit message	Last commit date
Latest commit History 18 Commits
.github/workflows		.github/workflows
src		src
tests		tests
.gitignore		.gitignore
.npmignore		.npmignore
.prettierrc		.prettierrc
CHANGELOG.md		CHANGELOG.md
README.md		README.md
eslint.config.mjs		eslint.config.mjs
package.json		package.json
pnpm-lock.yaml		pnpm-lock.yaml
tsconfig.json		tsconfig.json
tsconfig.test.json		tsconfig.test.json
vitest.config.ts		vitest.config.ts

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@orbinum/sdk

Installation

Requirements

Quick Start

OrbinumClientProvider

rpc-v2

Modules

SubstrateClient

EvmClient

EvmExplorer

ZkVerifierModule

ShieldedPoolModule

PrivacyModule (rpc-v2)

Privacy Keys

AccountMappingModule

IndexerClient

Precompiles

Extrinsic & Event Decoders

Substrate SCALE Primitives

Key Derivation Chain

Development

Typing Layout

Extending rpc-v2

Commands

License

Installation

Requirements

Quick Start

rpc-v2

Modules

SubstrateClient

EvmClient

RpcV2Module

ShieldedPoolModule

PrivacyModule (rpc-v2)

Privacy Keys

AccountMappingModule

IndexerClient

Precompiles

Key Derivation Chain

Development

Typing Layout

Extending rpc-v2

License

About

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Releases 6

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PrivacyModule (`rpc-v2`)

Extending `rpc-v2`

PrivacyModule (`rpc-v2`)

Extending `rpc-v2`