We'll email your beta invite the moment your segment opens. Bitcoin UTXO attestations go live first (before May 15). Application integrations follow.
What happens next:
1. You'll get a confirmation email within 5 minutes.
2. When your segment opens, you'll receive your sandbox API key + onboarding link.
3. First 50 Bitcoin UTXO attestations are free (before May 15).
4. First 100 developers who ship a substrate integration before June 3 get the Pro tier free for one year.
While you wait: read how the architecture works. It's patented (129 claims filed), Bitcoin Core developers confirmed it, and it's the foundation for the integrate-then-prove flywheel.
The attestation flow you're joining is built on H33-74, which PRODUCES the portable 74-byte post-quantum proof, and fits within H33 AIR. Continuous control verification and claim evidence for that flow is handled by HATS. Every proof can be independently checked at Verification.