Igra Bridge

Bridge TKAS from Kaspa Testnet-10 (L1) to iKAS on Igra Galleon Testnet (L2).

How It Works

1. Connect Wallet - Connect your Kastle browser extension wallet
2. Enter Details - Specify amount (min 1 KAS) and your L2 address (0x...)
3. TX ID Mining - The bridge mines a nonce until the transaction ID matches the required 97b4 prefix
4. Sign & Broadcast - Kastle signs the pre-built transaction and broadcasts to Kaspa network
5. Receive iKAS - Igra L2 processes the transaction and mints iKAS to your L2 address

Technical Details

Entry Transaction (TxTypeId: 0x2)

The bridge constructs an Igra Entry transaction with the following payload format:

[0x92] [20-byte L2 address] [8-byte amount (LE)] [4-byte nonce (BE)]

• 0x92: Version (0x9) + TxTypeId (0x2)
• L2 Address: 20 bytes - Ethereum-style address to receive iKAS
• Amount: 8 bytes little-endian - Amount in SOMPI (1 KAS = 100,000,000 SOMPI)
• Nonce: 4 bytes big-endian - Mined to achieve required TX ID prefix

TX ID Mining

Igra requires L1 transaction IDs to start with 97b4. The bridge:

1. Connects to Kaspa network via WASM SDK Resolver (auto-discovers public nodes)
2. Fetches UTXOs for the sender's address
3. Builds a transaction with the Entry payload
4. Iterates nonces until Transaction.id starts with 97b4
5. Serializes to JSON and sends to Kastle for signing

Typical mining time: 1-3 seconds (~30,000-100,000 iterations)

KAS Locking UTXO

The first output of the L1 transaction sends the bridged KAS to the Entry address:

kaspatest:qqmstl2znv9tsfgcmj9shme82my867tapz7pdu4ztwdn6sm9452jj5mm0sxzw

Configuration

Parameter	Value
L1 Network	Kaspa testnet-10
L2 Network	Igra Galleon Testnet
L2 RPC	https://galleon-testnet.igralabs.com:8545
L2 Chain ID	38836
Entry Address	kaspatest:qqmstl2znv9tsfgcmj9shme82my867tapz7pdu4ztwdn6sm9452jj5mm0sxzw
TX ID Prefix	97b4
Min Amount	1 KAS

Development

Prerequisites

• Node.js 18+
• Kastle browser extension wallet
• Kaspa WASM SDK (in public/kaspa/)

Setup

cd projects/igra-bridge
npm install
npm run dev

Build

npm run build

Project Structure

src/
├── config.ts      # Network and bridge configuration
├── kastle.ts      # Kastle wallet integration
├── kaspa-wasm.ts  # WASM SDK loader
├── tx-miner.ts    # TX ID mining logic
├── bridge.ts      # Entry transaction construction
└── main.ts        # UI and state management

public/
└── kaspa/         # Kaspa WASM SDK files
    ├── kaspa.js
    ├── kaspa.d.ts
    └── kaspa_bg.wasm

Dependencies

• Kaspa WASM SDK - Transaction construction and TX ID computation
• Kastle Wallet - Signing and broadcasting transactions
• Vite - Development server and build tool
• TypeScript - Type safety

References

• Igra Transaction Protocol
• Kastle Wallet API
• Kaspa WASM SDK