Some of 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
• poseidon-rs: Poseidon hash implementation in Rust
• go-blindsecp256k1: Blind signatures over secp256k1 in Go (With the compatible Typescript implementation)
• kzg-commitments: Kate-Zaverucha-Goldberg Polynomial Commitments in Go
• go-dht: Kademlia DHT implementation in Go
• merkletree-rs: Sparse MerkleTree implementation in Rust
• go-merkletree: Sparse MerkleTree implementation in Go
• shamirsecretsharing: Shamir's Secret Sharing Rust & Go implementation + WASM lib
• cryptofun: Crypto algorithms from scratch, in order to get familiar with them from inside. For example: ECC, Paillier, RSA, Homomorphic computation, ElGamal, Schnorr, ECDSA, BN128, BLS, ...
• commonroutes: A car sharing smartphone app + server + bots, etc
• flock-botnet: A twitter botnet with autonomous bots replying tweets with text generated based on probabilities in Markov chains in Go
• blogo: Static blog generator, templating engine from markdown and html templates (what I use for my blog)
• coffeeminer: collaborative (mitm) cryptocurrency mining pool in wifi networks
• kvartalo: a local social cryptocurrency for neigbourhoods, that we are using in a Barcelona neighbourhood as experiment. Build on top of Ethereum blockchain & Tendermint Core
• go-chip8: CHIP-8 emulator written in Go
• chip8-rs: CHIP-8 emulator written in Rust
• 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)

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Recent Work:

Hermez zkRollup:
Decentralized zkRollup on Ethereum. My task has been to implement the Hermez node, used to launch the mainnet of the zkRollup network.
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).

• hermeznetwork/hermez-node: Go implementation of the Hermez zkRollup node v1.0.0.

iden3:
Blockchain project based on zero knowledge proofs to provide a scalable decentralized identity system with privacy by design. My task has been to 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: Go implementation of some cryptographic primitives (SNARK-friendly) used in iden3
• iden3/go-iden3-core: Go core implementation of the iden3 system
• iden3/go-circom-prover-verifier: Go implementation of the Groth16 zkSNARK Prover and Verifier compatible with Circom
• iden3/circuits: circom zkSNARK circuits used by the iden3 core protocol

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More projects directly in github: https://github.com/arnaucube

(Also, there is a mirror of all the repos at: https://git.arnaucube.com)

blog - github - twitter