Signal Architecture & Six-Layer Stack

The Arctura signal stack has six layers: L0 Human Intent (DID identity, root mandates, HITL escalation), L1 Orchestration Kernel (durable workflows, task routing, circuit breakers), L2 Safety & Sandbox (Wasm sandboxing, BFT consensus, hallucination detection), L3 Semantic Signal (JSON-LD, knowledge graphs, machine-readable state), L4 Memory & Retrieval (vector store, event sourcing, checkpoint store), and L5 Tool & Action (MCP-native tool registry, context windows, resource providers).

Resonance is Arctura's frequency-adaptive Byzantine Fault Tolerant consensus protocol. It attests agent mandates rather than ordering transactions. Three validator nodes reach consensus on each attested action. The protocol adapts its cycle frequency to network load, maintaining forward-only attestation with no re-orgs. All decisions are logged to the Truth Ledger with Merkle proofs.

A mandate chain is a cryptographically verifiable delegation of authority from a human principal to one or more autonomous agents. Each link specifies capability scopes, resource budgets, and escalation triggers. Agents cannot act beyond their mandate boundary; any out-of-scope action is blocked at the L2 Safety layer. This is what makes Arctura's autonomy safe — agents are sovereign actors within bounded authority, not unconstrained systems.

Every tool call in Arctura executes inside a Wasmtime-managed capability-restricted sandbox. The sandbox grants only the permissions declared in the tool's manifest and the agent's active mandate scope. There is no ambient authority — a tool cannot read environment variables, open network connections, or access filesystem paths outside its declared resource list. Zero sandbox escapes have been recorded in production deployments.

Arctura provides first-class support for MCP (Anthropic Model Context Protocol) for tool registry and context windows; A2A (Google Agent-to-Agent) for agent discovery via .well-known/agent.json; ACP (Agent Communication Protocol) for performative dialogue including request, propose, and inform; and AP2 (Agent Payment Protocol) for mandate-signed payment intents with full chain-of-custody. Wire formats are the source of truth — not adapters.

Arctura's carbon scheduler integrates live grid carbon intensity from WattTime and Electricity Maps. Non-urgent tasks with deadline slack are automatically deferred to low-carbon grid windows forecast up to 6 hours ahead. Per-mandate carbon spend is measured via Kepler and logged immutably. The result is a 28% average reduction in carbon footprint vs. unscheduled execution, and a net-negative position across the subnet.