Each major civilisational infrastructure layer has enabled the next. Communication infrastructure created the telephone network and the internet. Information infrastructure created search and the indexed web. Computational infrastructure created cloud computing and on-demand processing. Intelligence infrastructure — artificial intelligence — is being built now. This paper argues that the current trajectory is constructing the intelligence layer without the layer that must sit above it: verification. And that verification, operating at scale over time, produces something more valuable than intelligence alone: trust. *The Trust Layer is the civilisational infrastructure that converts verified intelligence into justified confidence — the persistent, accumulating, domain-independent substrate against which intelligence outputs are tested and through which systems earn the right to operate autonomously. It is to the intelligence age what the scientific method is to the knowledge age: the mechanism by which claims are tested against reality, and the infrastructure without which capability alone cannot produce reliability. Trust, as defined in this paper, is not a feeling, a marketing claim, or a decision to believe. It is justified confidence that a system's outputs have been verified against reality — a structural property of systems with demonstrated track records, not a psychological property of their users. As AI systems become increasingly autonomous — taking actions, managing resources, and making decisions without human oversight at every step — the operative question shifts from "is this specific output correct?" to "can this system be trusted?" That question cannot be answered without verification infrastructure, for the same reason that commerce cannot function without payment infrastructure and science cannot function without the scientific method. The idea that AI systems require verification is not new. Constitutional AI, formal verification methods, the EU AI Act's risk-based assessment framework, and dedicated verification institutions such as AVERI all reflect growing recognition that verification must be addressed. What remains largely unbuilt is verification as infrastructure* — not as a feature of individual systems or a requirement imposed by regulation, but as a shared, persistent, accumulating layer upon which the entire intelligence economy can operate. This paper proposes that verification is the missing civilisational infrastructure layer, that trust is what emerges when verification operates at scale, and that the organisations and systems that build verification infrastructure will hold structural advantages that capability improvements alone cannot replicate. This is the seventh paper in a series that has traced the path from the Verification Deficit (Paper 1) through the Recursive Hallucination Principle (Paper 2), Quality Engineering for Intelligence (Paper 3), Verification Intelligence as the stabilising function that maintains intelligence's relationship with reality (Paper 4), the architectural principles for verification-first systems in The Verification Substrate (Paper 5), and the accumulation of Machine Wisdom through verified experience (Paper 6) to arrive at its destination: trust as the defining infrastructure of the intelligence age. ---