trusted-setup.md

Trusted Setup

How to verify the correctness of execution?

Verify using MACI CLI

Clone the MACI repo and switch to version v0.10.1:

git clone https://github.com/appliedzkp/maci.git
cd maci/
git checkout v0.10.1

Follow instructions in README.md to install necessary dependencies.

x32 Circuits

Download zkSNARK parameters for 'x32' circuits into circuits/params/ directory and rebuild the keys:

cd circuits
./scripts/buildSnarks32.sh

To recompile all the params (with Linux):

# install deps
sudo apt-get install build-essential libgmp-dev libsodium-dev nasm git

# remove everything from the /params folder
rm -r circuits/params/*

# recompile binaries (takes time: ~5min to ~10min)
cd circuits
./scripts/buildSnarks32.sh

Recompile the contracts:

cd ../contracts
npm run compileSol

Download the logs:

cd cli
node build/index.js fetchLogs \
    --eth-provider <ETH_HOSTNAME> \
    --contract <MACI_CONTRACT_ADDR> \
    --start-block <BLOCK_NUMBER> \
    --num-blocks-per-request <BLOCKS_PER_REQ> \
    --output logs

Generate proofs:

node build/index.js genProofs \
    --eth-provider <ETH_HOSTNAME> \
    --contract <MACI_CONTRACT_ADDR> \
    --privkey <COORDINATOR_PRIVKEY> \
    --output proofs.json \
    --tally-file tally.json

Download the tally file and verify it:

cd ../cli
node build/index.js verify -t tally.json

Verify using clrfund scripts

Switch to contracts directory:

cd contracts/

Download zkSNARK parameters for 'medium' circuits to snark-params directory. Example:

ipfs get --output snark-params QmRzp3vkFPNHPpXiu7iKpPqVnZB97wq7gyih2mp6pa5bmD

Or download zkSNARK parameters for 'x32' circuits to snark-params directory. Example:

ipfs get --output snark-params QmWSxPBNYDtsK23KwYdMtcDaJg3gWS3LBsqMnENrVG6nmc

Set the path to downloaded parameter files:

export NODE_CONFIG='{"snarkParamsPath": "../../../contracts/snark-params/"}'

Verify:

yarn ts-node scripts/verify.ts tally.json