{
  "manageEntity": {
    "action": "Save",
    "entityId": "133891",
    "entityType": "Track",
    "nonce": "0x164322414d3c911f751f96c29874ae31a6139a6a8d19ea66569c92f477febbd7",
    "signature": "0x4cbec018edb90d31b33672a8a4b0452a36401406c01afa7a60519165f5b948d9036802605ad14d31988cd64ace1198f52e8a4038bdf43d292a5c43c76d264a8d1c",
    "signer": "0xbcF27CD259a120e92577BC7a7EB95670b3A0E2fA",
    "userId": "105402635"
  }
}