Confium Threshold

Eliminate single points of failure in your signing infrastructure.

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API reference

Canonical code shapes for Confium Threshold, with per-language tabs. Copy-paste-runnable.

Canonical flow: DKG → sign → verify

{`// Cargo.toml: confium-threshold = { version = "0.4", features = ["cmp20"] }
use confium_threshold::cmp20;

// 1. DKG (3 parties, threshold 2)
let keygen = cmp20::keygen(threshold=2, parties=3)?;

// 2. Sign with any 2 of 3 shares
let sig = cmp20::sign(
    &[keygen.shares[0].clone(), keygen.shares[1].clone()],
    threshold=2,
    message=b"hello",
)?;

// 3. Verify with the joint public key
assert!(cmp20::verify(&sig, &keygen.public_key, b"hello")?);`}

{`# DKG
confium threshold dkg --parties 3 --threshold 2 --scheme cmp20 --out ./shares/

# Sign with 2 of 3 shares
confium threshold sign \\
    --shares ./shares/party1.json ./shares/party2.json \\
    --message "hello" \\
    --out ./sig.der

# Verify
confium verify ecdsa-p256 \\
    --message "hello" \\
    --signature ./sig.der \\
    --public-key ./shares/public.json`}

{`# pip install confium
from confium.tc import Cmp20

# DKG
kg = Cmp20.keygen(threshold=2, parties=3)

# Sign with 2 shares
sig = Cmp20.sign([kg.shares[0], kg.shares[1]], threshold=2, message=b"hello")

# Verify
assert Cmp20.verify(sig, kg.public_key, b"hello")`}

{`# gem install confium
require 'confium'

# DKG
kg = Confium::TC::Cmp20.keygen(threshold: 2, parties: 3)

# Sign with 2 shares
sig = Confium::TC::Cmp20.sign([kg.shares[0], kg.shares[1]],
                              threshold: 2,
                              message: "hello")

# Verify
raise unless Confium::TC::Cmp20.verify(sig, kg.public_key, "hello")`}

Confium Threshold

API reference

Canonical flow: DKG → sign → verify

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