---
title: "OTER"
path: "/ecosystem/oter"
version: "1.0.0"
author: "Hydrate"
createdAt: "2026-07-03T07:45:37.788Z"
updatedAt: "2026-07-03T07:45:37.788Z"
---

# OTER

**OTER** (Optimistic Truth Engine, tagline "The truth will out.") is an [optimistic oracle under development on Radix DLT](https://oter.io). 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](https://oter.io). The design combines sealed-ballot juries, bonded answers, and atomic settlement.

OTER joins [Religant](/ecosystem/religant) among oracle projects building on Radix.

## OTER Beacon

The project operates the [OTER Beacon](https://random.oter.io/), a [drand](https://drand.love)-aligned min-pk BLS12-381 randomness beacon whose output is verifiable natively on Radix. Each round produces [one deterministic BLS signature](https://random.oter.io/); 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`](https://random.oter.io/info) 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"](https://oter.io/#signup), 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](https://oter.io)
- [random.oter.io — OTER Beacon (live randomness)](https://random.oter.io/)
- [Beacon info endpoint (public key, scheme, period)](https://random.oter.io/info)
- [drand — the distributed-randomness scheme the beacon aligns with](https://drand.love)