The UU Protocol introduces a new primitive for the internet — proof of human origin.
Human-Origin Proofs (HOPs) enable digital systems to recognize human participation without identity systems, personal data collection, or storage.
The protocol is designed as neutral infrastructure with permissionless participation and a strict zero-storage architecture.
This document describes the initial public specification of the UU Protocol and the architecture of Human-Origin Proofs (HOPs).
The protocol is currently in a pre-deployment phase. During this phase, the architecture is published for transparency, research, and technical discussion while ecosystem development and long-horizon partner alignment continue.
Future revisions of this specification may refine definitions, architecture, and protocol mechanics while preserving the protocol’s core principles.
These principles are defined in the repository's PROTOCOL_INVARIANTS.md and represent permanent commitments to privacy preservation, zero-storage architecture, and neutral infrastructure.
Digital systems currently lack a native capability to recognize whether activity originates from a human being or from automated or synthetic systems.
As artificial intelligence agents and automated participation increasingly populate digital environments, this limitation creates structural challenges across digital platforms.
The UU Protocol introduces proof of human origin as a new capability for the internet.
The protocol enables digital systems to recognize human-origin participation without identity systems, personal data collection, or storage.
A Human-Origin Proof (HOP) is a cryptographically anchored proof event generated through a unique physical human action bound to space and time.
Each proof event produces a Human-Origin Attestation confirming that a human-origin event occurred.
Digital systems may recognize these attestations as human-origin signals.
The protocol does not identify individuals and does not establish identity systems.
The following terms are used throughout this specification.
A cryptographically anchored proof event derived from a physical human action bound to space and time.
A cryptographic statement confirming that a human-origin event occurred.
A signal emitted by a Human-Origin Attestation allowing digital systems to recognize human-origin participation.
A ledger containing timestamp commitments confirming that proof events occurred. The ledger stores no identity information or personal data.
A system design in which no personal data, identity information, or behavioral records are stored or retained.
As artificial intelligence systems, automated agents, and synthetic identities increasingly populate digital environments, digital platforms face a structural limitation: they cannot reliably determine whether activity originates from a human being or from software.
Existing approaches rely on identity verification systems, behavioral monitoring, and centralized databases, which introduce privacy risks and increasing complexity.
The UU Protocol addresses this limitation by introducing proof of human origin as a protocol-level capability.
Proof of human origin is a cryptographic primitive enabling digital systems to recognize that an action originated from a real human being.
This capability operates without identity systems, personal data collection, or persistent user records.
Instead, the protocol produces cryptographic attestations confirming that a human-origin event occurred.
Human-Origin Proofs (HOPs) are cryptographically anchored proof events generated through unique physical human actions bound to space and time.
Each proof event produces a Human-Origin Attestation confirming that a human-origin event occurred at a specific moment.
The protocol records only timestamp commitments confirming that proof events occurred.
No identity data, personal information, or behavioral records are stored.
Proof events generated through physical human actions.
Cryptographic statements confirming human-origin events.
Signals emitted by attestations allowing digital systems to recognize human-origin participation.
A ledger containing timestamp commitments confirming proof events occurred, without storing personal data or identity information.
The UU Protocol operates under a strict zero-storage architecture.
The UU Protocol was created by Uniting Users, which currently acts as the protocol’s initial steward.
Stewardship is responsible for protecting protocol integrity and supporting ecosystem development during the pre-deployment phase.
The protocol is designed as neutral infrastructure and is not controlled by any centralized authority.
Protocol invariants define permanent commitments to privacy preservation, zero-storage architecture, and neutrality, and cannot be overridden by stewards or governance mechanisms.