# TinyCloud Protocol > Signatures Are All You Need: cryptographic access control for AI and applications. This is the > agent-readable Open Knowledge Format bundle for the TinyCloud data protocol. Start at index.md, > then drill into a section's index.md (progressive disclosure). Each section below lists its index. ## Sections - [Foundations](concepts/foundations/index.md): Framing, thesis, and trust model. - [Identity](concepts/identity/index.md): DIDs, SIWE, session keys, OpenKey. - [Spaces](concepts/spaces/index.md): The autonomic space primitive, addressing grammar, hosting. - [Authorization](concepts/authorization/index.md): Capabilities, delegation, invocation, CACAO validation. - [Policy Engine](concepts/policy-engine/index.md): The central permissioning primitive. - [Services](concepts/services/index.md): Node-hosted, capability-gated services (KV, SQL, hooks, ...). - [Encryption](concepts/encryption/index.md): At-rest, encryption networks, threshold decryption. - [Storage](concepts/storage/index.md): Blob store, metadata DB, per-space SQL. - [Consistency](concepts/consistency/index.md): Epochs/DAG, conflict resolution, replication. - [Applications](concepts/applications/index.md): Manifests, capability composition, TEE backends. - [Secrets](concepts/secrets/index.md): Secrets space and encrypted vault entries. - [Credentials](concepts/credentials/index.md): OpenCredentials feeding the policy engine. - [Nodes](concepts/nodes/index.md): Node architecture, TEE/DStack, host delegations. - [SDK](concepts/sdk/index.md): How to use the protocol from code. - [Future](concepts/future/index.md): Roadmap and design-intent items. ## Meta - [Glossary](meta/glossary.md): Canonical vocabulary and retired aliases. - [Contradictions](meta/contradictions.md): Tracked spec-vs-impl divergences. - [Sources](meta/sources.md): Provenance map and known gaps. - [Status](meta/status.md): Shipped / in-progress / planned matrix.