sudo npm install -g snarkjs
# or
sudo yarn global add snarkjs

cd $HOME
git clone https://github.com/WasmJuicer/ceremony.git
cd ceremony

# first get the latest contribution number
$ ls -1 ./participations | tail -n 1
4201_anonymous.zkey

# add your contribution
# just add 1 to the previous contribution
# Feel free to put your name / twitter handler / keybase

# First set the name
$ CONTRIBUTION_ID=4202_myname

# then run the following command
$ snarkjs zkey contribute ./participations/4201_anonymous.zkey ./participations/$CONTRIBUTION_ID.zkey --name="My Name" -v

$ wget https://hermez.s3-eu-west-1.amazonaws.com/powersOfTau28_hez_final_16.ptau
$ snarkjs zkey verify ./build/withdraw.r1cs ./powersOfTau28_hez_final_16.ptau "./participations/$CONTRIBUTION_ID.zkey"