Imago

Tamper-proof storage of Medical Images enabled with Blockchain

API auth headers (lightweight baseline)

Policy endpoints currently use a lightweight header-based identity context.

Required headers:

• X-Imago-Principal-Id
• X-Imago-Org-Id
• X-Imago-Role

Optional header:

• X-Imago-Principal-Type (user by default, service supported)

Behavior notes:

• Missing required auth headers return 401 Unauthorized.
• POST /api/v1/policy/grants and POST /api/v1/policy/grants/{grant_id}/revoke require admin or super_admin role.
• POST /api/v1/policy/evaluate derives principal identity from headers (not from body fields).

NVIDIA CLARA - MONAI Integration

MONAI cache usage is treated as a scratchpad layer, separate from canonical image storage.

• IMAGO_MONAI_CACHE_MODE controls whether MONAI-style caching is disabled, RAM-style (cache_dataset), or disk-style (persistent_dataset).
• IMAGO_MONAI_EMIT_LINEAGE_RECORDS optionally toggles cache lineage emission during scratchpad usage.
  • true: emit lineage records for reproducibility/audit.
  • false: skip lineage writes for performance-sensitive runs.

Scratchpad-vs-ledger churn benchmark

A benchmark harness is available to compare scratchpad latency with low vs high ledger update churn:

• scripts/test/benchmark_monai_scratchpad.py

It prints JSON with baseline/stressed latency metrics and exits non-zero if both ratio and absolute-delta thresholds indicate adverse impact.