Conclusion

Congratulations! You have written a basic json file to clear sign the transfer function for Tether USDT, and even learned some advanced features and tricks along the way. 🎉

Here is the final result for our smart contract example:

{
    "$schema": "https://github.com/LedgerHQ/clear-signing-erc7730-registry/blob/master/specs/erc7730-v1.schema.json",
 
    "context": {
        "$id": "Tether USD",
        "contract" : {
            "abi": "https://api.etherscan.io/api?module=contract&action=getabi&address=0xdac17f958d2ee523a2206206994597c13d831ec7",
            "deployments": [ 
                {
                    "chainId": 1,
                    "address": "0xdAC17F958D2ee523a2206206994597C13D831ec7"
                },
                {
                    "chainId": 137,
                    "address": "0xc2132D05D31c914a87C6611C10748AEb04B58e8F"
                },
                {
                    "chainId": 42161,
                    "address": "0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9"
                }
            ]
        }
    }, 
 
    "metadata": {
        "owner": "Tether",
        "info": {
            "legalName": "Tether Limited",
            "url": "https://tether.to/",
            "deploymentDate": "2017-11-28T12:41:21Z"  
        }
    },
 
    "display": {
        "formats": {
            "transfer(address _to,uint256 _value)": {
                "intent": "Send",
                "fields": [
                    {
                        "path": "_to",
                        "label": "To",
                        "format": "addressOrName"
                    },
                    {
                        "path": "_value",
                        "label": "Amount",
                        "format": "tokenAmount",
                        "params": {
                            "tokenPath": "@.to"
                        }
                    }
                ],
                "required": ["_to", "_value"],
                "excluded": []
            }
        }
    }
}

And here is the final result for our EIP-712 message example:

{
"$schema": "../../specs/erc7730-v1.schema.json",
"context": {
    "eip712": {
    "deployments": [
        { "chainId": 1, "address": "0x119c71d3bbac22029622cbaec24854d3d32d2828" },
        { "chainId": 10, "address": "0x11431a89893025d2a48dca4eddc396f8c8117187" },
        { "chainId": 56, "address": "0x1e38eff998df9d3669e32f4ff400031385bf6362" },
        { "chainId": 137, "address": "0x94bc2a1c732bcad7343b25af48385fe76e08734f" },
        { "chainId": 42161, "address": "0x7f069df72b7a39bce9806e3afaf579e54d8cf2b9" }
    ],
    "domain": { "name": "Permit2" },
    "schemas": [
        {
        "primaryType": "OrderStructure",
        "types": {
            "EIP712Domain": [
            { "name": "name", "type": "string" },
            { "name": "version", "type": "string" },
            { "name": "chainId", "type": "uint256" },
            { "name": "verifyingContract", "type": "address" }
            ],
            "OrderStructure": [
            { "name": "salt", "type": "uint256" },
            { "name": "maker", "type": "address" },
            { "name": "receiver", "type": "address" },
            { "name": "makerAsset", "type": "address" },
            { "name": "takerAsset", "type": "address" },
            { "name": "makingAmount", "type": "uint256" },
            { "name": "takingAmount", "type": "uint256" },
            { "name": "makerTraits", "type": "uint256" }
            ]
        }
        },
    ]
    }
},
"metadata": { "owner": "1inch Limit Order Protocol" },
"display": {
    "formats": {
    "OrderStructure": {
        "intent": "1inch Order",
        "fields": [
        { "path": "maker", "label": "From", "format": "raw" },
        { "path": "makingAmount", "label": "Send", "format": "tokenAmount", "params": { "tokenPath": "makerAsset" } },
        { "path": "takingAmount", "label": "Receive minimum", "format": "tokenAmount", "params": { "tokenPath": "takerAsset" } },
        { "path": "receiver", "label": "To", "format": "raw" }
        ],
        "excluded": ["salt", "makerTraits", "interactions", "allowedSender", "offsets"]
        "required": ["maker", "makingAmount", "takingAmount", "receiver"]
    }
    }
}
}

Here are some useful links to help you during the writing process:

Registry with lot of real integrations examples.
The Clear Signing ERC 7730 specification.
The Json Builder tool

Next steps

Test your integration.
Submit your pull request to the registry.

4. Advanced 1.b. EIP-712 message metadata file