{
  "manageEntity": {
    "action": "Save",
    "entityId": "903583887",
    "entityType": "Track",
    "nonce": "0x659eeeaf9cb425939425598be266c1cf22c9e0f7236fb092c06ffa9ee6a47c24",
    "signature": "0x0bb936bef28f4eae7d00cb355947f1ffc4a24518f47574c9abb0b0ea6a60cc0650f79157b77aec9e65f4464f53957dee1da07d8f4f8cc16e8c3517b2d13cf34b1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}