{
  "manageEntity": {
    "action": "Save",
    "entityId": "1921871504",
    "entityType": "Track",
    "nonce": "1785973359898470151",
    "signature": "0x952d63eaa30bc82aa02d02b1b6b47ffbe6d55741601593c393b27750e64b20ec5f41758a026243808af09f0e2d990d2d324d2586c5e2aaddb06e9973b468a6c11c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}