{
  "manageEntity": {
    "action": "Save",
    "entityId": "622160916",
    "entityType": "Track",
    "nonce": "0x0d94f22b48a36c4dce823918d4ca9ab69d705a3eccae11a270246889f5c24e1f",
    "signature": "0xdb2c1ae8b65a71f01c1a31938cd34f279f56ee1b734ad1c31c7fc229f0444c1e099de935344d8976ddff5602350437abd241b10c8999f40167996d45fa555b791b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}