{
  "manageEntity": {
    "action": "Save",
    "entityId": "771740033",
    "entityType": "Track",
    "nonce": "0xd319c4501b44ae37887ae4b69f40b108521f7cbc68a669948ed078b1f66fd2b6",
    "signature": "0x08e5dbaa64b5bb856a3efb4eee550cad8acd3bf3e1c00c863d44594db946fe594c9ad41b6882a0b1ed5e975363bd59b283ecea88b974233504454b50f03cb8b41c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}