{
  "manageEntity": {
    "action": "Save",
    "entityId": "1249978311",
    "entityType": "Track",
    "nonce": "0xdb11990065357a3af8b8335096f52d69dd3f0c67a73ce3ebb6446d8ed71bc630",
    "signature": "0xb521d82a32a99608686fd11edd8a6baad2d141e6d7c79f60f36d5ff138fa81525fe29567dc5030137694a2f07461cd133bf396154f2b93ed5ad7f24a44a044041c",
    "signer": "0x28945B345Dc8334c21B4e932dA506ca6Fac7e18a",
    "userId": "290283513"
  }
}