Proof of real-world presence.
EchoHash generates cryptographically verifiable
records of physical activity for use in digital applications.
Not where you claim to be. Where you actually
were.
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VerificationSecure ProofPrivacyZero Knowledge
The physical world has no native truth layer.
GPS can be spoofed.
QR codes can be shared.
Logs can be forged.
Attendance, movement, and activity are easy to fake—and hard to verify.
As more value moves between the digital and physical worlds, this gap becomes a liability:
- → Fraud grows
- → Trust erodes
- → Incentives break
What if presence itself could be verified?
EchoHash introduces a new standard: **Presence Confidence**.
A way for devices to cryptographically attest to being somewhere, at a moment in time, under real-world conditions—without exposing identity or tracking users.
How EchoHash Works
Not an App. Infrastructure.
We don’t decide what presence means—we simply verify that it occurred. EchoHash is the trust anchor between digital logic and physical reality.
Proof without surveillance.
Identity is optional. Location data is minimized. You prove that something happened—without revealing more than necessary.
Built for Adversity.
Systems should get stronger under pressure. Fraud attempts sharpen detection. Edge cases refine confidence.
Fewer assumptions. Stronger guarantees.
We believe reality should be verifiable, and privacy should be default. EchoHash is built for a world where identity is optional, but proof is mandatory.
Built from real-world constraints.
EchoHash is informed by practical experience building verification systems in adversarial physical environments.
EchoHash emerged from earlier work on verifying physical activity in adversarial environments. Those constraints continue to shape how the platform is designed today.
Who this is for