{
  "manageEntity": {
    "action": "Save",
    "entityId": "945525591",
    "entityType": "Track",
    "nonce": "0x18bdfc5ab1535001b6509b1b8efced024a001eeaed66ebf52dc4e21e8a662c97",
    "signature": "0x8cec92372c3d3f5cd31a38dc1122fbc5fe88cc2c6b9d924609e8251b6ebb868877bd20b127580dcc113fc77240403138f1caa201e995499fc35066d33d5931ad1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}