A DID for every agent. Verifiable on chain.
OAS — the Open Agent Specification — is the W3C-standard identity layer for autonomous entities. Every agent, tool, model, workflow, and organisation gets a portable DID. Sigil anchors them, locks in their lineage, and lets any verifier prove authority without trusting an intermediary.
Empty identity
Method
did
Namespace
oas
Network
sigil
Kind
agent
Identifier
analyst-7
An agent without a name
Every agent on Sigil starts as a slot.
A DID is a structured name. Before an agent has one, it has no authority — nothing to sign, nothing to be revoked, nothing to be slashed. The slot is empty, and the chain refuses to act on its behalf.
Part 1 · Method
did — the W3C DID method prefix.
Every DID starts with the literal string did:. This is the W3C standard. It tells every resolver in the world that what follows is a decentralised identifier, not a URL, not an email, not a username.
Part 2 · Namespace
oas — the Open Agent Specification.
OAS is the W3C-standard identity namespace for autonomous entities. Eleven kinds (human root, machine root, enterprise root, agent, tool, model, workflow, dataset, service, agent instance, skill) all share the same resolution rules and lineage proofs.
Part 3 · Network
sigil — anchored on the Sigil chain.
OAS is portable. A DID could be anchored on any blockchain or off-chain registry. The sigilsegment names which trust root this DID resolves through — for us, Sigil’s Global Anchor Layer.
Part 4 · Kind
agent — the entity is an autonomous agent.
OAS recognises eleven kinds. Pick the one that matches: an agent is an autonomous entity that signs on its own behalf. A tool is a deterministic function. A model is a versioned ML artifact. The kind drives which capabilities the DID can carry.
Part 5 · Identifier
analyst-7 — the unique handle.
The final segment is the agent's own name. It must be unique within the kind. The handle is human-readable on purpose: agents that work for humans should have names humans can remember.
Lineage unfolds
The DID is a leaf. The chain is the tree.
From the agent, lineage threads connect to the parent agent, to the organisation, and ultimately to a human root. Any verifier can walk this chain and prove the human accountable for the agent's actions. Identity becomes accountability.
One standard, eleven kinds
Everything that signs gets a name.
OAS covers every actor in the agent economy. Humans, machines, and employers serve as roots. Agents, tools, models, workflows, datasets, services, and instances all carry verifiable lineage back to one of those roots. One identity standard, eleven entity kinds.
Identity is the foundation.
Build agents that own their identity. Issue them, sign with them, prove them — across any chain, any tool, any partner.