SentinelCore - AntyCheat

1.2.3 [2] - Flight Detection Overhaul

Added

• Ground Spoof detection - new dedicated check that verifies the client's onGround flag against the server's own physical collision test, catching players who fake ground contact (e.g. to suppress fall damage or slip past hover detection).
• MotionY physics-curve check - Flight now simulates vanilla's actual vertical physics tick-by-tick and flags clients that deviate from it, catching subtler Fly hacks that fake a "legal-looking" trajectory instead of holding altitude outright.
• Vertical grace periods - knockback, explosions, Slime Block/Bed bounces, Wind Charge, and vehicle exits now grant a temporary, magnitude-scaled window where vertical checks relax, instead of a blanket "ignore everything" exemption.
• Position correction - once Flight/Ground Spoof evidence crosses the configured VL threshold, the player is reverted to their last confirmed safe ground location rather than just having the packet cancelled.
• New config sections: checks.flight.* and checks.ground-spoof.*, fully validated and hot-reloadable.

Changed

• Flight's hover detection now requires only 5 consecutive near-zero-delta ticks (down from 12) while airborne, tightening detection without needing a long airtime cap.
• Rewrote FlightCheck internals to reduce false positives around slime bounces, bed bouncing, and vehicle dismounts.

Fixed

• Slime Block, Bed, and vehicle-exit interactions no longer risk being misread as hover/motion anomalies.

Full technical detail available on request - this release focused on the Flight/Hover/GroundSpoof detection module specifically.