💰Private ERC20 Example

In this example demonstration of a private ERC20 implementation, we showcase the integration of Solidity smart contracts with Python and JavaScript scripts to create a secure and privacy-focused environment for managing token transactions. The Solidity code defines the ERC20 token contract, incorporating privacy-enhancing features to safeguard sensitive transaction data. Complementing this, the Python and JavaScript scripts provide a seamless interface for interacting with the contract, enabling functions such as token transfers, balance inquiries, and other operations while maintaining confidentiality. By combining these technologies, we demonstrate the potential for building robust, private blockchain applications that prioritize the protection of user data and transactions.

It aims to ensure the confidentiality of token transactions through encryptions while maintaining compatibility with the ERC20 standard.

Key Features:

• Privacy Enhancement:

The contract utilizes encryption techniques to encrypt sensitive data such as token balances and allowances. Encryption is performed using both user-specific and system-wide encryption keys to safeguard transaction details.

• Encrypted Balances and Allowances:

Token balances and allowances are stored in encrypted form within the contract's state variables. This ensures that sensitive information remains confidential and inaccessible to unauthorized parties.

• Integration with MPC Core:

The contract leverages functionalities provided by an external component called MpcCore. This component implements cryptographic operations such as encryption, decryption, and signature verification.

• Token Transfer Methods:

The contract provides multiple transfer methods, allowing token transfers in both encrypted and clear (unencrypted) forms. Transfers can occur between addresses with encrypted token values or clear token values.

• Approval Mechanism:

An approval mechanism is implemented to allow token holders to grant spending permissions (allowances) to other addresses. Approvals are also encrypted to maintain transaction privacy. An example of such a contract can be found here.