download ptau from amazon (hermez ceremony)

.github/workflows/build.yml

@@ -17,7 +17,6 @@ jobs:
       - run: yarn cache clean --all
       - run: yarn install --network-concurrency 1
       - run: yarn lint
-      - run: yarn download
       - run: yarn build
       - run: yarn test
       - name: Telegram Failure Notification

package.json

@@ -14,7 +14,6 @@
     "compile": "npx hardhat compile && yarn compile:hasher",
     "build": "npm run circuit && npm run compile",
     "deploy": "npx hardhat run scripts/deploy.js --network optimism",
-    "download": "curl -L https://github.com/tornadocash/tornado-pool/releases/download/ptau-download/ptau15 --create-dirs -o artifacts/circuits/ptau15",
     "test": "npx hardhat test",
     "eslint": "eslint --ext .js --ignore-path .gitignore .",
     "prettier:check": "prettier --check . --config .prettierrc",

scripts/buildCircuit.sh

@@ -2,11 +2,8 @@
 POWERS_OF_TAU=15 # circuit will support max 2^POWERS_OF_TAU constraints
 mkdir -p artifacts/circuits
 if [ ! -f artifacts/circuits/ptau$POWERS_OF_TAU ]; then
-  echo "Generating powers of tau file"
-  npx snarkjs powersoftau new bn128 $POWERS_OF_TAU artifacts/circuits/tmp_ptau$POWERS_OF_TAU
-  npx snarkjs powersoftau contribute artifacts/circuits/tmp_ptau$POWERS_OF_TAU artifacts/circuits/tmp2_ptau$POWERS_OF_TAU
-  npx snarkjs powersoftau prepare phase2 artifacts/circuits/tmp2_ptau$POWERS_OF_TAU artifacts/circuits/ptau$POWERS_OF_TAU
-  rm artifacts/circuits/tmp_ptau$POWERS_OF_TAU artifacts/circuits/tmp2_ptau$POWERS_OF_TAU
+  echo "Downloading powers of tau file"
+  curl -L https://hermez.s3-eu-west-1.amazonaws.com/powersOfTau28_hez_final_$POWERS_OF_TAU.ptau --create-dirs -o artifacts/circuits/ptau$POWERS_OF_TAU
 fi
 npx circom -v -r artifacts/circuits/transaction$1.r1cs -w artifacts/circuits/transaction$1.wasm -s artifacts/circuits/transaction$1.sym circuits/transaction$1.circom
 npx snarkjs groth16 setup artifacts/circuits/transaction$1.r1cs artifacts/circuits/ptau$POWERS_OF_TAU artifacts/circuits/tmp_transaction$1.zkey