How do I install the Proof Random Free Beacon skill?

Run npx skillmds@latest add pn/proof-random-free-beacon in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Proof Random Free Beacon safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: executes scripts, makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Proof Random Free Beacon?

Any agent that reads SKILL.md files can use this skill, including Claude Code, Claude.ai, Cursor, Codex, Windsurf, and 60+ others. Install it into the agent's skills directory and it loads on demand.

Is Proof Random Free Beacon free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Proof Random Free Beacon?

kepler-ops (@kepler-ops) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Proof Random Free Beacon by pn — Agent Skill

Name: Proof Random Free Beacon
Author: kepler-ops

Proof Random Free Beacon

Fetch a free drand quicknet beacon, verify its BLS signature independently in the client, and derive a nonce-bound integer with rejection sampling. Use for non-stakes agent demos that need public randomness; not for prizes or adversarial draws.

kepler-ops Updated Sep 27, 2026

File contents

Proof Random free beacon for agents

Use this only when the caller needs a public, verifiable randomness sample that does not settle money, decide prizes, or claim an adversarially fair draw. The Worker relays drand quicknet; it does not verify the BLS signature. The client in this repository verifies the exact round against an independent drand endpoint with a pinned chain hash and public key, then derives a nonce-bound integer by SHA-256 rejection sampling.

Fetch GET https://proof-random-api.pn-26f.workers.dev/v1/random?nonce=<unique-percent-encoded-id>&max=6; give nonce 1-128 characters and max 1..65536 (default 6). The response includes a derived integer value in [0,max) via rejection sampling. The Worker checks SHA-256(signature) == randomness but does NOT verify the drand BLS signature. The beacon is the latest published round; the nonce is reflected and used in integer derivation, not in selecting or changing the beacon.
Do not trust randomness or the server-derived value merely because the Worker returned it. Use verified-client.mjs and install the official drand-client package: npm install drand-client. Run node verified-client.mjs or import getVerifiedBeacon and sampleInteger. The client checks the BLS signature and the signature/randomness for the same round independently before setting clientVerified:true. If it errors, fail closed.
For an integer from 0 through N-1, use sampleInteger(await getVerifiedBeacon({nonce}), N), N = 1..65536. Do not use a modulo operation without rejection sampling.
A latest-round beacon may be known before an agent chooses to call. For an adversarial fairness claim, parties must agree on a future round, a nonce and rules before that round publishes. This API does not implement that agreement, and its current endpoint is unsuitable for stakes, prizes or security-critical draws.

Free API status: no charge and no x402 gate, no Bazaar index, no sales. Do not say this is a VRF or that the Worker verifies BLS. API status and examples: https://github.com/kepler-ops-maker/proof-random-api. Temporary demo page: https://brewpage.app/public/0M5fGsya2L. drand quicknet details: https://docs.drand.love/developer/.

---name: proof-random-free-beacondescription: Fetch a free drand quicknet beacon, verify its BLS signature independently in the client, and derive a nonce-bound integer with rejection sampling. Use for non-stakes agent demos that need public randomness; not for prizes or adversarial draws.---# Proof Random free beacon for agentsUse this only when the caller needs a public, verifiable randomness sample that does not settle money, decide prizes, or claim an adversarially fair draw. The Worker relays drand quicknet; it does not verify the BLS signature. The client in this repository verifies the exact round against an independent drand endpoint with a pinned chain hash and public key, then derives a nonce-bound integer by SHA-256 rejection sampling.1. Fetch `GET https://proof-random-api.pn-26f.workers.dev/v1/random?nonce=<unique-percent-encoded-id>&max=6`; give `nonce` 1-128 characters and `max` 1..65536 (default 6). The response includes a derived integer `value` in `[0,max)` via rejection sampling. The Worker checks `SHA-256(signature) == randomness` but does NOT verify the drand BLS signature. The beacon is the latest published round; the nonce is reflected and used in integer derivation, not in selecting or changing the beacon.2. Do not trust `randomness` or the server-derived `value` merely because the Worker returned it. Use [verified-client.mjs](https://github.com/kepler-ops-maker/proof-random-api/blob/main/verified-client.mjs) and install the official [drand-client](https://github.com/drand/drand-client) package: `npm install drand-client`. Run `node verified-client.mjs` or import `getVerifiedBeacon` and `sampleInteger`. The client checks the BLS signature and the signature/randomness for the same round independently before setting `clientVerified:true`. If it errors, fail closed.3. For an integer from 0 through N-1, use `sampleInteger(await getVerifiedBeacon({nonce}), N)`, N = 1..65536. Do not use a modulo operation without rejection sampling.4. A latest-round beacon may be known before an agent chooses to call. For an adversarial fairness claim, parties must agree on a future round, a nonce and rules before that round publishes. This API does not implement that agreement, and its current endpoint is unsuitable for stakes, prizes or security-critical draws.Free API status: no charge and no x402 gate, no Bazaar index, no sales. Do not say this is a VRF or that the Worker verifies BLS. API status and examples: https://github.com/kepler-ops-maker/proof-random-api. Temporary demo page: https://brewpage.app/public/0M5fGsya2L. drand quicknet details: https://docs.drand.love/developer/.

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