arnaucube

Engineer with interest in cryptography.

blog | github (git-mirror) | twitter

Some free time side projects:

go-snark-study: Go zkSNARK implementation from scratch (compiler, setup, prover, verifier)
go-bellman-verifier: Go Groth16 zkSNARK bellman proof verifier using cloudflare/bn256 Pairing
babyjubjub-rs: BabyJubJub elliptic curve implementation in Rust
kzg-commitments: Kate-Zaverucha-Goldberg (KZG10) Polynomial Commitments in Go
fri-commitment: FRI polynomial commitment in Rust
ipa-rs: modified Inner Product Argument (IPA) version from Halo paper in Rust using arkworks.
ring-signatures-rs: bLSAG ring signatures implementation in Rust
poseidon-rs: Poseidon hash implementation in Rust
go-blindsecp256k1: Blind signatures over secp256k1 elliptic curve in Go (with the compatible typescript implementation)
merkletree-rs: Sparse MerkleTree implementation in Rust (also a Go impl go-merkletree)
shamirsecretsharing: Shamir's Secret Sharing Rust & Go implementation + WASM lib
evm-rs: partial implementation of the Ethereum Virtual Machine (EVM) in Rust
kvartalo: a local social cryptocurrency for neigbourhoods, that we used in a Barcelona neighbourhood as experiment during few months. Build on top of Ethereum blockchain & Tendermint Core
chip8-rs: CHIP-8 virtual machine emulator written in Rust (also a Go impl go-chip8)
fft-rs: Fast Fourier Transform (FFT) implementation in Rust
miksi: Ethereum zk-coin-mixer where all the computation & constructions are done offchain and then proved inside a zkSNARK to the smart-contract. (live demo on testnet)
eth-kzg-ceremony-alt: Alternative implementation of the contributor-client for the Ethereum KZG Trusted Setup Ceremony

More projects directly in github: https://github.com/arnaucube (Mirror of all the repos at: https://git.arnaucube.com).

Recent Work:

Vocdoni & Aragon-Research (current) -

Decentralized governance & voting tooling.
Design and implementation of voting schemes using zkSNARKs and other cryptographic schemes.

vocdoni/keccak256-circom: ethereum sha3 (keccak256) hash function implemented in Circom
vocdoni/zk-census-proof: anonymous census proof circuit used in Vocdoni's Blockchain
- aragonzkresearch/ark-anon-vote: (similar design, implemented in arkworks) onchain anonymous voting snark circuit.
vocdoni/arbo: optimized MerkleTree which parallelizes by CPUs for faster computation, compatible with circomlib implementation
aragonzkresearch/ark-ec-blind-signatures: Blind signatures over elliptic curve implementation (native & r1cs constraints)

OVOTE: Offchain Voting with Onchain Trustless Execution (kind of a validity-Rollup for voting)

OVOTE technical document
Forum post with a high level explanation.
aragonzkresearch/ovote: implementation of the OVOTE circuits, smart contracts & libs
aragonzkresearch/ovote-node: OVOTE backend node implemented in Go

Blind-OVOTE: (OVOTE with Blind Signatures) L2 validity rollup combined with blind signatures over elliptic curves inside zkSNARK, to provide offchain anonymous voting with onchain binding execution on Ethereum

Blind-OVOTE technical document
Forum post with a high level explanation.
aragonzkresearch/blind-ovote: Blind-OVOTE implementation in arkworks.

Hermez zkRollup -

Decentralized zkRollup on Ethereum.
Main task has been to implement the Hermez node, used to launch the mainnet of the zkRollup network (1.0):
hermeznetwork/hermez-node
My focus has been mainly in the TxSelector, TxProcessor (managing the rollup state tree) and BatchBuilder (generating the data structure compatible with the zkSNARK circuits to do the proof generation).

iden3 -

Scalable decentralized identity system with privacy by design by using zero knowledge proofs.
Design and specify the core protocol, develop the core libraries, servers, smart contracts, zk circom circuits and zkSNARK Groth16 Go prover.

iden3/go-iden3-crypto: cryptographic primitives (SNARK-friendly) used in iden3
iden3/go-iden3-core: core implementation of the iden3 system
iden3/go-circom-prover-verifier: implementation of the Groth16 zkSNARK Prover and Verifier compatible with Circom
iden3/circuits: zkSNARK circuits used by the iden3 core protocol

blog | github (git-mirror) | twitter