{
  "manageEntity": {
    "action": "Save",
    "entityId": "303083",
    "entityType": "Track",
    "nonce": "0xaa754a449f206e4a6739cc777799002c8a99f8ea7d335c3684683de4f31774df",
    "signature": "0x2433809e376bc20167aaf7a1159eaec6b49fb901213427d94af2fe3e7279bbdd0b0daf87a8f627f279b954f5d727b6ced4039a57227e7753b817b25b49c897031b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}