{
  "manageEntity": {
    "action": "Save",
    "entityId": "105170304",
    "entityType": "Track",
    "nonce": "0x501f2c1916556d8f4c23e4ebebc74108a9c8a90a7264504e73ac505da8b9b485",
    "signature": "0x73c2b6599a5253aadfff19a609b72be59cd1775f996c587c235000ff8ddc38ed6b3fe44c9b6d0dc520435f7ec9000097a12e3d4083fe4893f5edd49bd32da3501b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}