{
  "manageEntity": {
    "action": "Save",
    "entityId": "1870636189",
    "entityType": "Track",
    "nonce": "0x2f00986ff3f3a082d1c30fccf7945b715ddcc9bfb547a2520432754993772ef7",
    "signature": "0x3aba547e4833d28f6ef78ccd6f26d27a499505b2af44b21f24b04243339b35de22d7f949ff7607453edd281630ce3658192dfd31ac7b1532ebab3c27bff55c101b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}