NoChance Anti-Cheat

NoChance Anti-Cheat -----

Anti-cheat with trust-based system and 4-layer validation cascade system & packet analysis

PacketEvents Required for 1.21.x
PacketEvents
Note: Plugin can work without it but it may cause problems
https://nochance-ac.com/

What is NoChance?
NoChance is a server-side anti-cheat built around a 4-layer validation system with packet-level analysis. It catches cheaters without punishing legit players through trust scoring, adaptive sampling, and prediction-based detection.

Features

25+ Detection Modules — Fly, Speed, KillAura, FastBreak, Reach, NoClip, Jesus, Blink, Timer, ElytraFly, BoatFly, and more
4-Layer Validation — Multi-stage checks that filter out false positives before flagging
Prediction Engine — Tracks movement physics and combat patterns to catch subtle cheats
PacketEvents Integration — Deep packet analysis for 1.21-1.21.8
Bedrock/Geyser Support — Auto-detects Floodgate players with relaxed thresholds
Ping Compensation — Adjusts thresholds for high latency players
Trust Score System — Players build trust over time, skilled players get fewer false flags
Replay System — 30s buffer, saves violations for later review
Staff Tools — Spectate, freeze, verbose mode, clickable alerts with teleport and quick actions
In-Game GUI — Edit all settings through a menu, no file editing needed
Database Support — SQLite and MySQL with HikariCP pooling
Discord Webhooks — Violation alerts sent to Discord with rich embeds
Punishment System — Auto kicks, warnings, tempbans, fully configurable
Per-Check Config — Tune every detection module independently
Server Friendly — Adaptive sampling, async processing, batch operations

Detection Modules

Movement — Fly, Speed, NoClip, Jesus, Blink, Phase, Step, GroundSpoof, Timer
Vehicle — ElytraFly, BoatFly, Strider
Block — FastBreak, FastPlace, Nuker, Scaffold
Combat — KillAura, AutoClicker, Reach, Criticals
Damage — NoFall, Velocity
Player — Inventory, NoSlow, BadPackets

Commands
/nc menu — Open config GUI
/nc reload — Reload config
/nc info <player> — Player stats
/nc violations <player> — Violation history
/nc reset <player> — Reset player data
/nc toggle <check> — Enable/disable a check
/nc stats — Global statistics
/nc alerts — Toggle staff alerts
/nc spectate <player> — Spectate invisibly
/nc freeze <player> — Freeze/unfreeze
/nc verbose — Toggle verbose output
/nc profile <player> — Player profile and ping
/nc replay list — List saved replays
/nc replay play <file> — Watch a replay

Aliases: /nc, /ac, /anticheat

Permissions
nochance.admin — Full access (default: op)
nochance.alerts — Receive alerts (default: op)
nochance.bypass — Bypass all checks (default: false)
nochance.bypass.<check> — Bypass a specific check (default: false)
nochance.staff.spectate — Spectate command (default: op)
nochance.staff.freeze — Freeze command (default: op)
nochance.staff.verbose — Verbose mode (default: op)

nochance.bypass.fly
nochance.bypass.speed
nochance.bypass.noclip
nochance.bypass.jesus
nochance.bypass.fastbreak
nochance.bypass.fastplace
nochance.bypass.nuker
nochance.bypass.killaura
nochance.bypass.nofall
nochance.bypass.autoclicker
nochance.bypass.reach
nochance.bypass.inventory
nochance.bypass.scaffold
nochance.bypass.timer
nochance.bypass.velocity
nochance.bypass.criticals
nochance.bypass.phase
nochance.bypass.step
nochance.bypass.blink
nochance.bypass.noslow
nochance.bypass.badpackets
nochance.bypass.groundspoof
nochance.bypass.elytrafly
nochance.bypass.strider
nochance.bypass.boatfly

Code (YAML):

general:
time_window_seconds : 60
grace_period_seconds : 3
min_samples : 3
op_exempt : true
notify_player_on_flag : false

thresholds:
low_confidence : 0.65
medium_confidence : 0.80
high_confidence : 0.92
extreme_confidence : 0.97

advanced_filtering:
enabled : true
bayesian_prior : 0.08
z_score_threshold : 2.0
min_trust_score : 0.4
established_baseline_checks : 30
established_baseline_time_seconds : 45

actions:
kick_on_extreme_confidence : true
kick_on_high_confidence : true
warn_on_high_confidence : true
warn_on_medium_confidence : true
log_low_confidence : true

checks:
fly:
enabled : true
threshold : 1
severity_multiplier : 2.5
max_velocity_y : 0.55

speed:
enabled : true
threshold : 1
severity_multiplier : 3.0
max_speed : 0.32
sprint_multiplier : 1.30
ice_multiplier : 2.4

killaura:
enabled : true
threshold : 1
severity_multiplier : 3.5
max_reach : 3.1
max_angle : 35.0
max_rotation_speed : 500.0
max_cps : 15.0

reach:
enabled : true
threshold : 1
severity_multiplier : 3.5
max_entity_reach : 3.15
max_block_reach : 4.5

# 20+ more checks with individual settings

database:
type : SQLITE
host : localhost
port : 3306
database : nochance
username : root
password : password
table_prefix : nc_

discord:
enabled : false
webhook_url : ""

replay:
enabled : true
buffer_seconds : 30
before_seconds : 10
after_seconds : 15
retention_days : 7
save_on_high : true
save_on_extreme : true

bedrock:
exempt : false
relaxed_checks : true
tolerance_multiplier : 1.3

ping_compensation:
enabled : true
high_ping_threshold : 120
max_multiplier : 1.4

skill_profiles:
low:
max_cps : 8
min_cps : 3
max_rotation_speed : 200
medium:
max_cps : 12
min_cps : 7
max_rotation_speed : 350
high:
max_cps : 18
min_cps : 11
max_rotation_speed : 550