{
  "manageEntity": {
    "action": "Save",
    "entityId": "1481643691",
    "entityType": "Track",
    "nonce": "0x9bae4db89cab92248fa752573bdbcfbe943211140c683574bafbf5731d8cb23a",
    "signature": "0x4b6a8857b77b7ec1cdd63b785b7294311ec4ef234a05330f420ce1b325a4af307a9981aee1267b223a6da68a7f39b1bc16b37a552382c13c3e54cd603feb641b1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}