{
  "manageEntity": {
    "action": "Save",
    "entityId": "672360508",
    "entityType": "Track",
    "nonce": "0x03b7583f09f68b21558f6ce78ff66e23a0c48a12fcee66ac457039db174a6931",
    "signature": "0x752ad2e0f4d7fffe324c2a0d69dec4686485f3c2015d4e3516a2fc201c9a46bc6a678bad5d3cb922a1840a639e1ea227632e906e7da6727cf13d6eb2ead930d51c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}