{
  "manageEntity": {
    "action": "Save",
    "entityId": "547855852",
    "entityType": "Track",
    "nonce": "0x3e68f52e8a23b4edabad85d611953ff69ae01ed8461939e67829d829a53d05ef",
    "signature": "0x6fb8afb4e7be1b8ee656b6c4f748e69bedb0c7cc0a13a07742ef1b17c40365220090ed34dc3e3128592d53b781a8835fc6a70ddbb5162bfd583d2113e47023d41c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}