dot-ring 0.1.6

Serves as a library to generate and verify a signature using IETF, Pedersen and Ring VRF-AD Schemes

dot-ring is a Python library for Verifiable Random Functions with Additional Data (VRF-AD) supporting 10+ elliptic curves, including IETF VRF, Pedersen VRF, and Ring VRF.

Specifications: Bandersnatch VRF • Ring Proof • RFC9381 • RFC9380

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Installation

Install from PyPI (Recommended)

Pre-built wheels are available for Linux and macOS - no build tools required:

pip install dot-ring

Development Setup

For building from source, you need system dependencies:

OS	Command
macOS	brew install swig
Ubuntu/Debian	sudo apt install swig build-essential
Fedora/RHEL	sudo dnf install swig gcc-c++
Arch	sudo pacman -S swig base-devel

Then install in development mode:

git clone https://github.com/chainscore/dot-ring.git
cd dot-ring
pip install -e .[dev]

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Usage

secret_key = bytes.fromhex("3d6406500d4009fdf2604546093665911e753f2213570a29521fd88bc30ede18")
alpha = b"input data"
ad = b"additional data"

Deterministic key generation from a seed (matching ark-vrf):

from dot_ring import Bandersnatch, secret_from_seed

seed = (0).to_bytes(32, "little")
public_key, secret_scalar = secret_from_seed(seed, Bandersnatch)

IETF VRF

from dot_ring import Bandersnatch, IETF_VRF

# Generate proof
proof = IETF_VRF[Bandersnatch].prove(alpha, secret_key, ad)

# Verify
public_key = IETF_VRF[Bandersnatch].get_public_key(secret_key)
is_valid = proof.verify(public_key, alpha, ad)

# Serialize
proof_bytes = proof.to_bytes()
proof = IETF_VRF[Bandersnatch].from_bytes(proof_bytes)

Pedersen VRF

from dot_ring import Bandersnatch, PedersenVRF

# Generate proof (public key is blinded in proof)
proof = PedersenVRF[Bandersnatch].prove(alpha, secret_key, ad)

# Verify
is_valid = proof.verify(alpha, ad)

Ring VRF

from dot_ring import Bandersnatch, RingVRF

# Setup ring
ring_pks = [pk1, pk2, pk3, ...]  # list of public keys
ring_root = RingVRF[Bandersnatch].construct_ring_root(ring_pks)

# Generate proof
my_pk = RingVRF[Bandersnatch].get_public_key(secret_key)
proof = RingVRF[Bandersnatch].prove(alpha, ad, secret_key, my_pk, ring_pks)

# Verify (proves membership without revealing which key)
is_valid = proof.verify(alpha, ad, ring_root)

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Testing

pytest tests/

See TESTING.md for details.

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Docker

docker build -t dot-ring .
docker run -it dot-ring pytest tests/

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Troubleshooting

Error	Solution
swig: command not found	Only needed for building from source. Install: brew install swig / apt install swig
gcc failed	Only needed for building from source. Install: xcode-select --install / apt install build-essential
Import errors	Try: pip install dot-ring --force-reinstall --no-cache-dir

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Contact

Prasad // Chainscore Labs

Email • Website

Benchmarks

See the docs/BENCHMARK.md for performance results.