Deploying Smart Contracts: Solidity & RAda

Rapid Chain supports a hybrid virtual machine architecture, allowing developers to choose the optimal environment based on the specific risk profile and complexity of their financial logic.

10.1. Deploying Solidity Contracts (EVM)

Standard Solidity contracts can be deployed using existing Ethereum tooling. This allows for rapid migration of existing DeFi protocols while benefiting from Canton’s institutional settlement.

// Hardhat Deployment Script Example
async function main() {
  const RapidStablecoin = await ethers.getContractFactory("RapidStablecoin");
  const token = await RapidStablecoin.deploy();
  
  await token.deployed();
  console.log("Rapid Stablecoin deployed to:", token.address);
}

10.2. High-Assurance Logic with RAda

For operations where correctness, determinism, and formal verifiability are paramount, Rapid Chain introduces RAda. RAda is a high-assurance smart contract language derived from safety-critical programming paradigms used in aerospace and defense systems.

Key Characteristics of RAda:

• Formal Verifiability: RAda is designed for mathematical proof of correctness, allowing developers to verify that a contract behaves exactly as specified before deployment.

• Safety-Critical Origins: Built upon paradigms used in environments where failure is not an option, RAda eliminates common smart contract vulnerabilities like integer overflows or reentrancy at the compiler level.

• Deterministic Execution: Every RAda instruction has a predictable and deterministic state transition, essential for high-value institutional settlement.

• Selective Usage: RAda is not a replacement for Solidity but a complementary tool; institutions can choose RAda for high-risk operations like collateral netting while using Solidity for general-purpose logic.

RAda Code Example (High-Assurance Settlement):

The following snippet demonstrates a secure asset netting operation using RAda’s high-assurance syntax (based on SPARK/Ada safety standards):

-- RAda High-Assurance Settlement Module
package Rapid_Settlement is
   type Asset_Amount is range 0 .. 10**18;
   
   -- Secure transfer procedure with pre-conditions and post-conditions
   procedure Secure_Netting (
      Sender    : in out Account;
      Receiver  : in out Account;
      Amount    : in     Asset_Amount
   ) with
      Pre  => Sender.Balance >= Amount, -- Formal verification of solvency
      Post => Sender.Balance = Sender.Balance'Old - Amount and
              Receiver.Balance = Receiver.Balance'Old + Amount;
end Rapid_Settlement;

package body Rapid_Settlement is
   procedure Secure_Netting (
      Sender    : in out Account;
      Receiver  : in out Account;
      Amount    : in     Asset_Amount
   ) is
   begin
      Sender.Balance   := Sender.Balance - Amount;
      Receiver.Balance := Receiver.Balance + Amount;
   end Secure_Netting;
end Rapid_Settlement;

This ensures that critical financial operations like Multilateral Netting or Repo Collateral Calls are executed with the same level of rigor as flight control systems.