Atomic Cross-Domain Interaction Guide

The defining feature of Rapid Chain is its inherent ability to interact with other Canton domains—such as a Bank Node or a Regulator Node—without the use of intermediary bridges. This technology ensures that ownership is synchronized across disparate ledgers simultaneously, rather than "locking and minting" wrapped assets on secondary chains.

11.1. The Atomic Intent Workflow (In-Depth)

Unlike traditional "Bridge and Wrap" models, Rapid Chain utilizes "Financial Intents" for state synchronization. This process operates on an "Atomic Commit" principle (all-or-nothing); the transaction either occurs in both domains simultaneously or fails entirely, leaving no room for mismatched states.

Step-by-Step Execution Process:

1. Intent Creation: The user signs an intent on Rapid Chain, such as swapping $RAPID for a tokenized treasury bond.

2. Execution Validation: The Rapid Sequencer validates the trade logic, checks margin requirements, and calculates the net change.

3. Canton Synchronization: The execution result is forwarded to the Canton Network as a formal settlement instruction.

4. Global Commit: The Global Synchronizer ensures that both the execution layer (Rapid Chain) and the settlement layer (Canton) update their states in a single, indivisible step.

Feature	Traditional Bridging	Rapid Chain Atomic Interaction
Asset Type	Wrapped Assets	Native Assets
Trust Model	Trust in Bridge Operator	Protocol-Level Synchronization
Speed	Dependent on Confirmations	Instant (Atomic)
Risk	Smart Contract/Bridge Hacks	Mathematical Finality

11.2. Cross-Domain Instruction Structure

To format execution results correctly for the Settlement Layer, developers must utilize the CantonIntegrationAdapter component.

Advanced Solidity Interface (EVM Domain):

The following interface demonstrates how a transaction initiated within the Rapid Chain environment triggers Legal Finality on the Canton Network.

// Advanced Atomic Cross-Domain Settlement Interface
interface ICantonAdapter {
    /**
     * @dev Submits the execution result to the Canton settlement layer.
     * @param targetCantonDomain The hash of the target institution's domain (e.g., DTCC).
     * @param assetIdentifier Unique identifier of the asset on Canton.
     * @param finalizedAmount The confirmed amount after netting/execution.
     * @param syncProof Cryptographic proof provided by the Global Synchronizer.
     */
    function submitSettlement(
        bytes32 targetCantonDomain, 
        address assetIdentifier, 
        uint256 finalizedAmount,
        bytes calldata syncProof
    ) external returns (bool success);

    /**
     * @dev Queries the legal finality status of a transaction.
     */
    function checkLegalFinality(bytes32 txHash) external view returns (bool isFinalized);
}

Critical Note: Through this architecture, complex trade logic is processed in Rapid Chain's high-performance environment while Asset Custody and Legal Records remain securely anchored in the Canton Network’s regulated and secure system of record.