OTER

OTER (Optimistic Truth Engine, tagline "The truth will out.") is an optimistic oracle under development on Radix DLT. Users ask any verifiable question and it settles on-chain: an answer backed by a bond stands if it goes unchallenged through a bonded challenge window, and contested answers are decided by staked voters casting timelock-sealed ballots. The design combines sealed-ballot juries, bonded answers, and atomic settlement.

OTER joins Religant among oracle projects building on Radix.

OTER Beacon

The project operates the OTER Beacon, a drand-aligned min-pk BLS12-381 randomness beacon whose output is verifiable natively on Radix. Each round produces one deterministic BLS signature; the on-chain jury seed is derived as keccak256(signature) over the domain-separated message keccak256("oter-jury-beacon:v1" ‖ round), which is what makes jury selection unpredictable in advance yet publicly verifiable afterwards. The beacon runs on a 3-second period under the scheme oter-min-pk-g2-pop and exposes a public HTTP API (/public/latest, /info, /health). Signatures cannot be served before their round time — the unpredictability guarantee.

Status

As of July 2026 OTER is pre-mainnet: the site offers a mailing list for "mainnet milestones, testnet access, and protocol deep-dives", and the beacon is live and healthy at random.oter.io. The project surfaced in the Radix Developer Discussion Telegram in July 2026.

External Links

• oter.io — official site
• random.oter.io — OTER Beacon (live randomness)
• Beacon info endpoint (public key, scheme, period)
• drand — the distributed-randomness scheme the beacon aligns with