Principal
A persistent identity for a person, organization, device, service, pseudonym, or AI agent.
Technology / Architecture
One state. Many specialized providers. No implicit authorities.
Actum separates who performs work from who can decide validity. Builders, provers, AI workers, storage providers, and gateways contribute specialized services under one deterministic state transition standard.
01IntentA principal requests an action
→02AuthorityCredentials, capabilities, and policy
→03EvidenceExecution proof or assurance receipt
→04FinalityOne committed global state
Protocol primitives
Assets, attributes, and policies should mean the same thing everywhere.
Credential
A signed claim made by an issuer about a principal, with selective disclosure built in.
Capability
A scoped grant of authority that can narrow through delegation, never expand.
Policy
A deterministic rule defining when an action is permitted, publicly or privately.
Object
A versioned unit of state, ownership, value, identity, data, or a model manifest.
Job
An asynchronous request for expensive computation with declared inputs, budgets, and evidence.
Proof / Receipt
Machine-verifiable evidence explaining why a result should be accepted.
Agent interfaces / MCP + A2UI
Connect agents without letting interfaces become permissions.
MCP exposes bounded, typed tools and proof-bearing resources. A2UI can explain an exact canonical intent for human review, while wallet-verified values and native approval remain in control. Every consequential request is still checked against identity, capability scope, policy, budget, nonce, expiry, and replay state.
Open interfaces · explicit authorityDiscover. Read. Propose.
No arbitrary RPC, reusable credentials, generic signing endpoint, or generated UI that can silently widen authority.