BS-AntiCheat

Movement, combat, world, inventory and packet-level cheat detection that's actually tuned not to flag your legit players. Install it, and your builders, miners and PvPers keep playing , while cheaters get caught.
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File Details
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BSAntiCheat-1.0.0.jar

ByBoondockSulfur
  • R
  • Jul 3, 2026
  • 354.38 KB
  • 6
  • 1.21.11+11

File Name

BSAntiCheat-1.0.0.jar

Supported Versions

  • 1.21.11
  • 1.21.10
  • 1.21.9
  • 1.21.8
  • 1.21.7
  • 1.21.6
  • 1.21.5
  • 1.21.4
  • 1.21.3
  • 1.21.2
  • 1.21.1
  • 1.21

[1.0.0] - 2026-07-02

First public release. Live-tested and false-positive-calibrated on a real server, verified on both Paper and Folia.

Detections

  • Movement: Speed, Fly (vertical burst + sustained hover), Teleport, GroundSpoof, Elytra/Riptide speed ceiling.
  • Combat: Reach (measured to the hitbox surface), KillAura (aim angle + multi-target), AimSnap (robotic snap-back rotation), Criticals, AutoBlock.
  • World: Nuker, FastPlace, Scaffold, FastBreak (per-block dig time vs. Block#getBreakSpeed).
  • Vehicle: Boat-Fly and per-type vehicle speed via VehicleMoveEvent (movement checks don't fire while riding, so this closed a real gap).
  • Packet-level (needs PacketEvents): AutoClicker, BadPackets, Timer, crash protection (oversized book/sign packets are cancelled), packet-flood — the last two stay active even under server lag.
  • XRay: per-ore thresholds, ore/stone ratio, combined-rare-ore, restricted-world zones, player-placed-ore exclusion.
  • Inventory (opt-in): InventoryMove, ChestStealer, FastUse, BowSpam, AutoTotem.

Accuracy & internals

  • No sampling: every movement is checked (not every 10th), so a cheat can't hide between samples.
  • Server-authoritative ground check (bounding-box vs. the world) instead of the spoofable client flag — hardens Fly/hover against NoFall/Fly spoofing.
  • Transaction-latency system: a per-tick ping/pong measures true round-trip latency; movement, vehicle and elytra lag compensation use it instead of the coarse getPing().
  • Grace windows for teleport, knockback, join/respawn/world-change and elytra landings (residual glide momentum no longer flags as Speed).
  • AutoClicker excludes mining swings; Reach measured to the hitbox surface; XRay resets its evidence after each flag (no VL spirals); Creative/Spectator exempt.

Platform & integrations

  • Folia support via a Paper/Folia scheduler abstraction — verified against a real Folia 1.21.11 server with zero scheduler exceptions; behaviour on Paper is unchanged.
  • Bedrock exemption (exempt_bedrock_players) via Geyser/Floodgate detection.
  • Legacy-client exemption (exempt_legacy_clients, opt-in) via ViaVersion.
  • LuckPerms group whitelist, PlaceholderAPI (%bsanticheat_total%, %bsanticheat_vl_<check>%), Discord webhook alerts, bStats, update checker.

Enforcement & operations

  • Violation-level system with decay and configurable punishment tiers (console commands), optional setback; report-only by default.
  • 25+ calibration thresholds in config.yml, all tunable live via /bsac reload.
  • SQLite logging with a plaintext fallback logger; silent mode; bilingual (EN/DE); auto-migrating config.

Defaults & notes

  • The false-positive-prone movement micro-heuristics — NoSlow, Jesus, Spider, Step — and Velocity/AntiKnockback ship off by default (opt-in). They need further hardening; the reliable checks are enabled out of the box.
  • autoclicker_max_cps defaults to 20 (skilled humans reach ~17–20; autoclickers exceed it).

Notable fixes since the internal extraction

  • Correct shading: sqlite-jdbc/slf4j are provided by Paper (jar shrank from ~11 MB to ~355 KB).
  • Thorns damage no longer flags the victim as KillAura; sweep hits no longer cause bogus reach/angle flags.
  • DatabaseManager: no silent log loss (batch overflow, failed inserts, shutdown drains fully).
  • Thread-safety fixes (config/language published atomically); non-blocking command player lookups; Discord webhook timeouts.

Origin

Extracted from the PerformanceAnalyzer plugin (v2.3.4) as a standalone anti-cheat: movement and XRay detection with lag compensation, LuckPerms whitelist, Discord webhooks, SQLite logging, silent mode and bilingual support. Everything above builds on that base.