Privacy Token

Privacy Token

The project uses a general ERC20Secret contract developed based on the Oasis Sapphire privacy library to achieve encrypted balances and private transfers, and provides a signature authorization interface based on EIP-712 to complete token transactions without leaving traces on-chain.

• Balance Privacy: The contract internally encrypts and stores balances, and ordinary queries only return data visible to the user themselves.
• Signature Authorization: Supports VIEW / TRANSFER / APPROVE permissions based on EIP-712, avoiding exposure of sensitive authorization details on-chain.
• No Event Logs: Does not record event logs, avoiding leaving token transaction traces on-chain.
• Anti-Replay: Signature uniqueness verification and expiration time limit prevent reuse.
• Wrap/Unwrap: Can wrap/unwrap with basic ERC20, compatible with external liquidity. Native tokens like sapphire testnet (TEST) can directly use deposit/withdraw interfaces.

After deploying the ERC20Secret contract, use the wrap and unwrap interfaces to wrap ERC20 tokens into ERC20Secret tokens to achieve the minting of privacy tokens.

Note: Each ERC20Secret token can only correspond to one ERC20 token.

Network and Contract Deployment (Mainnet/Testnet)

• WTRC: The token of the WikiTruth project.
• WTRC.S: The ERC20Secret token of WTRC.
• wROSE.S: The ERC20Secret token of wROSE.

Item	Mainnet	Testnet
Network Name	Oasis Sapphire	Oasis Sapphire Testnet
Chain ID	23294	23295
WTRC	TBD	0x990DE401CD0103a0107D27F82283db60F4844203
WTRC.S	TBD	0x449e2CD61F0328Ae68f4A530170C892B45b4B269
wROSE.S	TBD	0x4e30337908E19917f3F74adB45966114A55205c2

EIP-712 Key Structure Example

// EIP-712 domain parameters
bytes32 private constant EIP712_DOMAIN_TYPEHASH = keccak256(
    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
);
bytes32 public immutable DOMAIN_SEPARATOR;

bytes32 public constant EIP_PERMIT_TYPEHASH = keccak256(
    "EIP712Permit(uint8 label,address owner,address spender,uint256 amount,uint256 deadline)"
);

enum PermitLabel { VIEW, TRANSFER, APPROVE }

struct EIP712Permit {
    PermitLabel label;
    address owner;
    address spender;
    uint256 amount;
    uint256 deadline;
    SignatureRSV signature;
}