Primary reply

$1.47B market with 4-player Part 135 concentration means every secondary operator entering on Part 108 needs proof-of-presence infrastructure that isn't owned by their competitor. Wing and Amazon aren't going to share delivery logs. GridStamp is the independent layer: 14.55M ops fleet-sim benchmarked, 91% spoof detection, 3ms P99 — built so operators not named Zipline can prove what landed where.

Followup

proof-of-presence SDK: https://getbizsuite.com/gridstamp.html

NOTE: switching from cold-email → reply. Source is a programming-helper.com market analysis article — no individual contact email or email field in lead data. Rerouted to a targeted reply on the article's discussion thread.