curl --request GET \
  --url https://cloud-api.phala.com/api/v1/kms/on-chain/{chain}

{
  "chain_name": "<string>",
  "chain_id": 123,
  "contracts": [
    {
      "contract_address": "<string>",
      "chain_id": 123,
      "chain_name": "<string>",
      "devices": [
        {
          "device_id": "<string>",
          "node_name": "<string>",
          "on_chain_allowed": true
        }
      ],
      "os_images": [
        {
          "name": "<string>",
          "version": "<string>",
          "os_image_hash": "<string>",
          "on_chain_allowed": true
        }
      ]
    }
  ]
}