A smart contract creation framework for tokenizing traditional trading assets — stocks, bonds, futures, and options — on the Ethereum blockchain.

This project bridges traditional finance and DeFi by providing a framework to represent real-world financial instruments as on-chain tokens, complete with the business logic that governs them.

Overview

Tokenization is the process of representing ownership of real-world assets as blockchain tokens. This project builds a framework that:

  1. Defines token standards for different asset classes (equities, bonds, futures, options)
  2. Provides a factory pattern for deploying new asset tokens
  3. Encodes financial logic into smart contracts (dividends, coupons, expiry, settlement)
  4. Includes tooling for deployment, testing, and interaction

Architecture

Blockchain Tokenization Architecture

Asset Types & Token Standards

Equities (ERC-20)

Stocks are fungible — one share of AAPL is the same as any other. ERC-20 is the natural fit.

Key features:

  • Fractional ownership via token divisibility (18 decimals)
  • Dividend distribution through snapshot-based claims
  • Corporate actions (splits, mergers) via admin functions
  • Transfer restrictions for compliance (whitelisting)
contract EquityToken is ERC20, Ownable {
    string public symbol;         // e.g., "AAPL"
    uint256 public totalShares;

    // Dividend distribution
    mapping(uint256 => uint256) public dividendPerShare;
    uint256 public currentEpoch;

    function claimDividend(uint256 epoch) external { ... }
    function distributeDividend() external onlyOwner { ... }
}

Bonds (ERC-20)

Bonds are fungible within the same issuance. The smart contract encodes coupon payments and maturity.

Key features:

  • Automated coupon payments on schedule
  • Maturity date with redemption logic
  • Yield calculation helpers
  • Credit rating metadata
contract BondToken is ERC20, Ownable {
    uint256 public faceValue;
    uint256 public couponRate;      // basis points
    uint256 public maturityDate;
    uint256 public couponFrequency; // seconds between payments

    function payCoupon() external { ... }
    function redeem() external { ... }
}

Futures & Options (ERC-1155)

Derivatives are semi-fungible — contracts with the same strike and expiry are interchangeable, but different strikes are not. ERC-1155 handles this naturally.

Key features:

  • Each token ID represents a unique (strike, expiry, type) combination
  • Expiry and settlement mechanics
  • Oracle integration for price feeds (Chainlink)
  • Margin and collateral management
contract DerivativeToken is ERC1155, Ownable {
    struct Contract {
        uint256 strike;
        uint256 expiry;
        bool isCall;       // true = call, false = put
        address underlying;
    }

    mapping(uint256 => Contract) public contracts;

    function exercise(uint256 tokenId) external { ... }
    function settle(uint256 tokenId) external { ... }
}

Smart Contract Factory

The factory pattern allows deploying new asset tokens with a single transaction:

contract TokenFactory is Ownable {
    event TokenCreated(address token, string assetType, string symbol);

    function createEquity(
        string memory name,
        string memory symbol,
        uint256 totalShares
    ) external returns (address) { ... }

    function createBond(
        string memory name,
        uint256 faceValue,
        uint256 couponRate,
        uint256 maturityDate
    ) external returns (address) { ... }

    function createDerivative(
        address underlying,
        uint256[] memory strikes,
        uint256[] memory expiries
    ) external returns (address) { ... }
}

Technology Stack

Component Technology Why
Smart Contracts Solidity 0.8.x Industry standard for Ethereum
Framework Hardhat Testing, deployment, debugging
Testing Chai, Mocha Comprehensive unit and integration tests
Price Feeds Chainlink Decentralized oracle for settlement
Frontend React + ethers.js Wallet connection and contract interaction
Network Ethereum Sepolia (testnet) Free testing environment

Security Considerations

Financial smart contracts require rigorous security:

  • Reentrancy protection — all external calls follow checks-effects-interactions
  • Access control — role-based permissions (admin, issuer, trader)
  • Pausability — emergency stop mechanism for all token contracts
  • Upgradeability — proxy pattern for bug fixes without redeployment
  • Overflow protection — Solidity 0.8.x built-in checks
  • Oracle manipulation — time-weighted average prices, multiple oracle sources

What You’ll Learn

This project demonstrates:

  • How to model different financial instruments as smart contracts
  • The ERC-20 and ERC-1155 token standards and when to use each
  • Factory pattern for smart contract deployment
  • Oracle integration for real-world price data
  • Security patterns for financial smart contracts
  • Testing strategies for Solidity contracts

Repository

The full source code is available on GitHub: diepdaocs/tokenized-assets

Updated:

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