Trust Model

Entangle’s trust model is not a checklist. It is the shape of the architecture. Each role owns the keys it signs with and nothing else; the edges decide who may talk to whom; the wire is the audit log.

Identity is per role

• Host Authority signs control commands: graph revisions, runner trust decisions, runtime assignments.
• Runner identity signs hello, heartbeats, receipts, and observations.
• User Node identity signs user task launches, replies, and approvals.
• Node runtime identity signs A2A messages emitted by the running node.
• Git principal signs or authenticates git operations only.
• Operator identity authorizes Host API mutations through the bootstrap operator-token boundary; it does not replace User Node identity.

No actor speaks for another. The Host does not sign as a user. The user does not sign as a runner.

Edges are the authorization model

Typed edges decide who may delegate, review, escalate, or hand off. Effective edge routes are validated before a runner emits a task.handoff. Authority is graph-shaped; nothing routes outside the graph.

Secrets stay at the boundary

Secrets should remain outside browser bundles, URLs, non-secret runtime context, and durable logs.

• Model and git credentials resolve at the Host into effective runtime context.
• Secrets reach runners as mounted files where applicable.
• Git transport supports principal bindings without embedding raw token material in remote URLs.
• Auth-mode selection is explicit per profile — there is no unsafe implicit default.

The wire is the audit log

Signed Nostr events on dedicated rumor kinds are the operational record. NIP-59 wrapping protects metadata; signatures bind every event to a specific signer; dedup keys prevent replay.

Audit signal exposed today:

• Host status and protected mutation events (host.operator_request.completed).
• Runtime trace events: session, conversation, approval, artifact, runner-turn lifecycle.
• Recovery events: history, controller updates.
• Source-mutation evidence with approval scope.

This is operator-grade audit signal. Compliance attestations are a separate program (see “Capability layers” below).

Runtime posture

The runtime gives operators clear identity, coordination, and audit boundaries:

• optional ENTANGLE_HOST_OPERATOR_TOKEN bootstrap boundary with bearer-token propagation through Host client, CLI, and Studio;
• Host-managed external principals for backend identities (e.g. git);
• runtime isolation between runner processes and node workspaces;
• NIP-59 wrapped Nostr events for A2A coordination;
• audit-style host events for protected mutations;
• runtime trace events for session, turn, approval, artifact, recovery evidence.

Federation layer

The federation layer includes:

• stable User Node identity with signed task / reply / approval messages;
• Host Authority key with status, export/import, rotation;
• signed control / observe event lanes with verification and dedupe;
• runner registry with explicit trust, revoke, and stale states;
• projection store built from signed observations, removing implicit Host-reads-runner-filesystem trust.

Security capabilities

These capabilities sit on the same runtime:

• production identity beyond bootstrap operator-token;
• multi-tenancy primitives;
• audit retention and SIEM-ready export;
• compliance workflows (SOC 2, ISO 27001, HIPAA);
• security review and responsible disclosure.

Reporting

Email security@entangle.run with reproduction steps, affected commits, impact, and any relevant runtime evidence — events, traces, signed messages.