EIP-712 message metadata
EIP-712 messages allow dApps to request signatures for structured data. Clear Signing for EIP-712 enhances security by displaying the structured data in a human-readable format before signing.
Creating EIP-712 Metadata
For EIP-712 structured data signing, you’ll need to create specialized metadata that includes:
- Domain information (name, version, chain ID, verifying contract)
- Type definitions for all structured data types
- Display formats for showing structured data to users
{
"$schema": "../../specs/erc7730-v1.schema.json",
"context": {
"eip712": {
"deployments": [
{
"chainId": 1,
"address": "0x7f268357a8c2552623316e2562d90e642bb538e5"
}
],
"domain": {
"name": "OpenSea",
"chainId": 1,
"verifyingContract": "0x7f268357a8c2552623316e2562d90e642bb538e5"
},
"schemas": [
{
"primaryType": "Order",
"types": {
"Order": [
{ "name": "exchange", "type": "address" },
{ "name": "maker", "type": "address" },
{ "name": "basePrice", "type": "uint256" },
{ "name": "expirationTime", "type": "uint256" }
]
}
}
]
}
},
"metadata": {
"owner": "OpenSea"
},
"display": {
"formats": {
"Order": {
"intent": "OpenSea Listing",
"fields": [
{ "path": "basePrice", "label": "Price", "format": "tokenAmount" },
{ "path": "expirationTime", "label": "Expires", "format": "datetime" }
]
}
}
}
}For detailed instructions on creating EIP-712 metadata, refer to the template.
Key Differences from Smart Contracts
EIP-712 structured data signing differs from smart contract signing in several ways:
- Message Structure: Describes structured typed data rather than contract function calls
- Direct Rendering: EIP-712 messages are rendered directly by the Ethereum app without requiring the Generic Parser
- Domain Information: Requires additional domain information to properly identify the message source
