{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507736639",
    "entityType": "Track",
    "nonce": "0x57978ac8ef0f4614cc5737e69ae2a01ac5d90aa88188532d13fe1cc1d11656cc",
    "signature": "0x34656ea210d8fff59f5365e3aad864d8860ce0bf542a57d528b160b0c03ee4592d7b843fea19178b25614dc82431346247636b98a3c5193c94722b112d84adcc1b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}