{
  "manageEntity": {
    "action": "Save",
    "entityId": "496688",
    "entityType": "Track",
    "nonce": "0xa96a22dd9c766bba5bf3c5255a1f2952157c94dae0bfe2da9adf0a63826818cf",
    "signature": "0x1714b6ed31e627e51845903b96ecc8670981914ac55f2198aae973725be581230a15fbd418c7f1552c7797be4ab9004616304589cb6e27e34bc17430966512a01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}