SIS — Structural Integrity Score
What It Measures
SIS measures the authenticity of a Telegram community — whether its structure (member base, engagement patterns, growth trajectory) reflects genuine organic activity or is artificially constructed.
SIS answers the question: Is this community real?
Output range: [0, 100]
Formula
SIS = αO + βD + γC − δAVariable Definitions
| Variable | Definition |
|---|---|
O | Organic growth ratio — proportion of growth attributable to non-spike, non-coordinated join events |
D | Engagement depth — ratio of substantive interactions (replies, thread participation) to surface interactions (emoji, views) |
C | Creator overlap — number of distinct creators in overlapping narrative clusters who also engage with this community |
A | Anomaly score — detected anomalies including symmetrical join spikes, engagement asymmetry, bot-pattern markers |
Weighting Coefficients
| Coefficient | Weight (approximate) | Rationale |
|---|---|---|
α | 0.35 | Organic growth is the primary integrity signal |
β | 0.30 | Engagement depth is the strongest anti-bot signal |
γ | 0.20 | Creator overlap confirms narrative legitimacy |
δ | 0.15 | Anomaly penalty, inverted contribution |
Exact coefficient values are not disclosed. The above weights are representative approximations to prevent direct optimization gaming.
Interpretation Guide
| SIS Range | Interpretation |
|---|---|
| > 70 | Structurally sound. Community demonstrates consistent organic behavior across all four dimensions. |
| 30–70 | Moderate integrity. Some organic signal present but mixed with synthetic elements. Requires further analysis. |
| < 30 | Structurally fragile. High anomaly score or very low engagement depth. High probability of artificial construction. |
What Lifts SIS
- Consistent, asymmetric join growth over weeks (not spikes)
- High reply-to-view ratios on content posts
- Multiple independent creators referencing the community
- Low join/leave churn rate
- Organic engagement spread across message types (not just pinned posts)
What Destroys SIS
- Symmetrical join spikes (strongest single negative signal)
- View counts dramatically exceeding reply counts (engagement asymmetry)
- No creator cross-reference (narrative isolation)
- Sudden large drops in member count followed by rapid recovery (bot churn pattern)
- Engagement concentrated exclusively on promotional content
SIS below 30 is a structural red flag regardless of AVI. A community with high velocity and low integrity is likely in a coordinated pump cycle.
Role in REP
SIS is the highest-weighted single input in REP composition. A low SIS score significantly suppresses REP regardless of other model outputs. This design choice reflects the protocol’s core thesis: authenticity is the primary dimension of credibility.