I haven't, I'm still building this thing out. Tracking NIP-65 events seemed the logical way to recursively expand out relay discovery, followed by actually connecting to newly learned relays from those events and requesting their own NIP-65 events, etc.
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This is great. I had assumed something like this must exist. My current efforts started as a side quest to understand why the NIP-65 inbox/outbox model seemed so broken; I hadn't intended to build out a full relay crawler 😏
For outbox mis/adventures please write here 🙏