Verify both header seal & entropy in one go

[tomusdrw]

Perf results:

== before
==                 min: 4054.6 [μs]
==                 max: 35782.4 [μs]
==                 mean: 12099.1 [μs]
==                 median: 11188.8 [μs]
==                 stdDev: 4575.2 [μs]
==                 p90: 17919.5 [μs]
==                 p99: 21330.7 [μs]

== after
==                 min: 3948.3 [μs]
==                 max: 25640.1 [μs]
==                 mean: 10940.5 [μs]
==                 median: 9877.1 [μs]
==                 stdDev: 4423.6 [μs]
==                 p90: 17457.6 [μs]
==                 p99: 19910.7 [μs]

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📝 Walkthrough

Walkthrough

A new public WASM-exported function verify_header_seals is added to the bandersnatch library that verifies both a header seal and entropy value using IETF VRF verification, returning a 65-byte result containing status and two 32-byte hashes.

Changes

Cohort / File(s)	Summary
VRF Header and Entropy Verification bandersnatch/src/lib.rs	Added verify_header_seals() function that deserializes a signer public key, performs IETF VRF verification on a seal, constructs an entropy payload by prefixing entropy\_prefix to the seal, verifies entropy via IETF VRF, and returns a 65-byte vector encoding verification status and two 32-byte hashes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Add function to generate seal #23 — Introduces generate_seal function for producing VRF output/proof, complementing this PR's verify_header_seals verification logic for the same seal/VRF functionality.

Suggested reviewers

• DrEverr

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and clearly summarizes the main change: a single function that verifies both header seal and entropy together, matching the core functionality added to lib.rs.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description check	✅ Passed	The PR description provides performance benchmark data showing improvements in execution time metrics (min, max, mean, median, stdDev, p90, p99) for the new implementation.

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