TruthfulAC

# TruthfulAC TruthfulAC was a paid plugin. Then it wasn't. The license key is gone, the obfuscation is gone, and the full source is public because a free anti-cheat that's actually good does more for the community than another plugin sitting behind a paywall. The open source AC space has movement covered. Grim exists. What it doesn't have is combat detection worth using. TruthfulAC fills that gap with GCD analysis, aim consistency tracking, statistical autoclicker detection, and a simulation-based movement engine that handles the edge cases most free plugins ignore entirely. Use it. Fork it. Contribute to it. --- ## ⚙️ Installation 1. Drop (https://modrinth.com/plugin/packetevents) into `/plugins/` 2. Drop `TruthfulAC.jar` into `/plugins/` 3. Restart No license key. No activation. No account. That's it. --- ## 🛡️ Checks ### 🏃 Movement **Simulation** — The core of the plugin. A full server-side physics engine that predicts where a player should be every tick and compares it against what was actually sent. | Check | Description | |-------|-------------| | Simulation A | Validates vertical and horizontal movement against the server's compensated physics model. Catches fly, bhop, and speed across virtually every movement state | | Simulation B | Covers elytra abuse and hard speed cap violations that slip past the primary simulation | | Simulation C | Per-state movement validation targeting context-specific exploits within individual movement tags like swimming, climbing, and vehicle states | | Simulation D | Supplementary movement validation for edge cases and transitional movement states not covered by A through C | **NoFall / Ground Spoof** — Six checks targeting every known variant of fake ground state packets used to suppress fall damage. | Check | Description | |-------|-------------| | GroundSpoof B | Flags ground state claims at Y positions that don't align to any valid block surface | | GroundSpoof C | Catches clients claiming ground while actively falling, covering the standard NoFall packet | | GroundSpoof D | Blocks ground state claims at impossible Y positions including negative coordinates and void level | | GroundSpoof E | Tracks accumulated server-side fall distance and flags when expected fall damage is suppressed | | GroundSpoof F | Cross-references the client's ground claim against actual block collision state in the world cache | | GroundSpoof G | Detects rapid ground state pulsing with no corresponding movement, a pattern produced by specific NoFall configurations | **Velocity** — Detects anti-knockback by tracking whether players actually apply velocity after acknowledging it via transaction packets. | Check | Description | |-------|-------------| | Velocity A | Flags immediate velocity non-acceptance where players acknowledge the transaction but show no horizontal response on tick one | | Velocity B | Catches vertical velocity suppression, specifically upward knockback from explosions and jumps | | Velocity C | Extended horizontal velocity check covering ticks two and three post-acknowledgement for delayed anti-KB configurations | | Velocity D | Detects near-zero velocity yield on both axes simultaneously, targeting configs that reduce all knockback without fully zeroing it | **Other Movement** | Check | Description | |-------|-------------| | Timer A | Transaction-based tick timing that detects timer speed hacks by measuring real time against packet acknowledgement balance rather than system clock, avoiding false flags on lagging players | | Baritone A | Detects the rotation snap density pattern produced by Baritone's pathfinder during automated navigation | | Baritone B | Identifies robotic mining patterns with systematic block targeting consistent with automated pathfinding and not human play | | Baritone C | Flags suspiciously consistent block break intervals over time, another signature of automated mining bots | | Inventory A | Detects players sending inventory click packets while simultaneously sending movement updates, something vanilla clients never do | --- ### ⚔️ Combat **Aim** — Ten checks covering every major approach to aimbot detection including GCD analysis, acceleration profiling, entropy measurement, temporal quantization, and statistical modeling. | Check | Description | |-------|-------------| | Aim A | GCD grid analysis that validates rotation steps align with the quantization pattern of a real mouse sensitivity setting | | Aim B | Detects sudden large rotation snaps in combat context that exceed what human flicking produces | | Aim D | Flags zero or near-zero rotational acceleration across both axes, the signature of a constant-speed linear aimbot | | Aim E | Low entropy detection that identifies rotation distributions too uniform and consistent to be human | | Aim F | Temporal quantization that detects rotation timing intervals suspiciously consistent with programmatic input | | Aim G | Jerk analysis measuring the third derivative of