{
  "manageEntity": {
    "action": "Save",
    "entityId": "1488271488",
    "entityType": "Track",
    "nonce": "0x7a39e467f324dee82135c1e80e346e81885b4702037d0046c74c16152796f13a",
    "signature": "0xa25bef68f723ebf4e81139e8e1522bc546139c388f9d993b8a091af4ff9c551214bb16b1da3a22186e613caa791c50b16e3f4bff37fb83c520f8926f5aef5da91c",
    "signer": "0x866CB73184a8420C302e3850B610761F882C4DDE",
    "userId": "166428182"
  }
}