Arbitrum Bridge
Strong trust profile for this bridge. TrustGrade score 89/100 (Grade A-).
Score Breakdown
How the TrustGrade algorithm computed this score.
Wilson Score Lower Bound
95% confidence interval lower bound on positive outcome rate. Penalizes small samples automatically.
Bayesian Posterior
Beta(α,β) posterior mean with sceptical prior. Adjusts observed rate toward conservative estimate.
Incident Penalty
Compound penalty: 1−(1−s)². 10% incidents → 19% penalty. 30% → 51%.
Volume Bonus
Log-credibility bonus: log₁₀(n)×k. More data = more confidence, diminishing returns.
Signal Contributions
Each signal's contribution to the final score. Positive = trust-building. Negative = risk-indicating.
| Signal | Value | Weight | Contribution | Visualization |
|---|---|---|---|---|
| Bridge Security Score | 82.0% | ±7 | +4.48 | |
| Validator Set Size | 75.0% | ±8 | +4.00 | |
| Incident History | 80.0% | ±9 | +5.40 | |
| Team Transparency | 75.0% | ±4 | +2.00 | |
| Upgrade Mechanism | 78.0% | ±4 | +2.24 |
Why this grade?
Strong trust profile for this bridge. TrustGrade score 89/100 (Grade A-).
The TrustGrade algorithm combines the Wilson score lower bound (which requires substantial evidence to score high), a Bayesian posterior (which shrinks toward a conservative estimate when sample sizes are small), a compound incident penalty (which grows faster than linear), a log-credibility volume bonus, and 5 weighted optional signals specific to generics.
Use this score
Query the TrustGrade API or embed a badge on your site.
API Query
curl -s https://api.trustgrade.ai/v1/score/generic/Arbitrum%20Bridge \
-H "Authorization: Bearer $TRUSTGRADE_KEY" | jq .{
"entity": "Arbitrum Bridge",
"type": "generic",
"score": 89,
"grade": "A-",
"confidence": 0.9364,
"summary": "Strong trust profile for this bridge. TrustGrade score 89/100 (Grade A-).",
"breakdown": {
"wilson": 0.9469,
"bayesian": 0.8833,
"incidentPenalty": 0.01,
"volumeBonus": 7
},
"computedAt": "2026-07-21T00:00:00.000Z"
}Embed Badge
<script src="https://trustgrade.ai/widget.js"></script>
<div data-trustgrade="generic:Arbitrum%20Bridge" data-size="medium"></div>