hiffi-artist-intelligence/reports/audit_report_latest.md

HIFFI Multi-Platform Cohort Audit Report

Audit Timestamp: 2026-10-26 07:07:00 UTC
Total Cohort Size: 500 artists

1. Multi-Platform Coverage Summary

Platform Signal	Covered Artists	Coverage Ratio	Verification Status
YouTube Baseline	500	100.0%	Complete Production Anchor
Spotify Telemetry	206	41.2%	Strict NaN (No Imputed Zeroes)
Instagram Audience	340	68.0%	Strict NaN (No Imputed Zeroes)
Complete 3-Platform Signals	176	35.2%	100% Signal Completeness (Tier 3)
Partial Platform Cohort	324	64.8%	Proportionally Re-Weighted

2. Publication Eligibility Layer

• Top 10 Evidence Gate: Strictly requires Tier 3 (3 verified platforms) -> PASSED
• Top 50 Evidence Gate: Strictly requires Tier >= 2 (>= 2 verified platforms) -> PASSED
• Consecutive Numbering: Published ranks strictly contiguous from 1 to 500 without gaps or duplicates.
• Raw Score Preservation: Continuous hiffi_xp_score remains unchanged before and after publication filtering.

3. Top Rank Gainers (Lifted by Multi-Platform Momentum)

Artist	Prod Rank	XP Rank	Rank Delta	Spotify Listeners	IG Followers
6ix9ine	490.0	280	+210	14,426,040	23,000,000
Lil Baby	455.0	259	+196	31,478,424	23,000,000
NBA YoungBoy	455.0	311	+144	N/A	12,000,000
Trae tha Truth	490.0	356	+134	N/A	2,000,000
Mobb Deep	455.0	344	+111	7,761,594	345,000

4. Top Rank Fallers (Awaiting Secondary Verification)

Artist	Prod Rank	XP Rank	Rank Delta	Spotify Listeners	IG Followers
Roy Woods	14.0	174	-160	3,342,003	986,000
Token	53.0	211	-158	3,665,603	N/A
Method Man	25.0	182	-157	3,537,700	3,000,000
Coco Jones	30.0	180	-150	3,608,363	5,000,000
Russ Millions	12.0	161	-149	3,430,231	1,000,000

5. Governance Compliance Verification

• Zero-Imputation Policy: Missing platform values preserved as genuine NaN.
• Monotonicity & Bounds: HIFFI-XP bounded in [0.0, 100.0]; inverse rank monotonic.
• Proportional Dynamic Weighting: Active platforms dynamically re-allocated.
• Test Suite Status: 20 of 20 tests passing via pytest test_multiplatform_ranking.py.