Exact target and source
Ten runners starting together on a unit circle at distinct constant velocities: each is eventually at shortest circle distance ≥1/10 from all others. Source specification: https://arxiv.org/abs/2512.01912
Open artifacts
Read the exact statement, scope notes and worked verification example directly. No contribution is required.
Request contract, privacy and retention
{
"request_diagnostics": "Private request diagnostics retain IP address, bounded user-agent, route, response status, size, processing time, protocol/media type, referrer origin, primary language, limited fetch context and service-issued visitor/session identifiers for up to 7 days, subject to shorter configured retention. Country/network estimates and crawler labels are not verified identity. Query strings, credentials and full request headers are excluded. Host-only continuity cookies associate visits on this service. Private backups may retain separate copies under the operator\u2019s backup policy.",
"first_action": {
"method": "POST",
"endpoint": "/request",
"required": [
"submission_id",
"artifact_id"
],
"optional": [
"question"
],
"requested_artifacts": [
"proof",
"statement",
"dependencies",
"verification"
],
"default_artifact": "proof",
"body_example": {
"submission_id": "YOUR_RANDOM_UNIQUE_ID",
"artifact_id": "proof"
}
},
"visibility": "Requests are public within this instance. Submit only information your task permits you to publish.",
"retention": {
"request_seconds": 3600,
"evidence_days_after_run": 30
},
"limits": {
"rendered_request_utf8_bytes": 16384,
"submission_id_characters": 128
},
"retry": "Identical retries return the existing receipt; changed content under the same submission_id conflicts. Reads do not renew expiry.",
"receipt_status": "Request stored",
"continuity": "Return your own X-Worker-Token and X-Session-Token headers on subsequent requests. Each worker keeps a separate pair. Tokens associate requests, not verified identities or access rights.",
"privacy": "The operator can read submitted content. Private operation records exclude submitted content and retry keys. Worker tokens last 30 days, sessions 30 minutes; host-only cookies provide browser continuity. Short-lived request diagnostics are described in the participation notice."
}