A root of the registered-user tree

GET/v1/user-set/roots/{root}

Whether root is, or was, the root of Keelson's registered-user tree: the Poseidon2 Merkle tree of every registered passkey's user_key_hash. A C3 proof under any root listed here was made by a registered user, who is hidden among the size users of that root. Roots stay valid after a passkey is removed. Keelson's relayer publishes every root to the RegisteredUserSet contract, which is what a verifier trusts; this route is a convenience.

Path parameters

rootstringRequired

Responses

200The root
404No such root

200 response

rootstringRequired
sizeintegerRequired: Registered users when the tree had this root.
created_atstringRequired

curl -X GET https://api.keelson.finance/v1/user-set/roots/{root}

const res = await fetch("https://api.keelson.finance/v1/user-set/roots/{root}", {
  method: "GET",
});
const data = await res.json();

Response · shape from the schema

{
  "root": "string",
  "size": 0,
  "created_at": "2026-11-11T00:00:00.000Z"
}