0. Install packages

• npm

npm i --save-dev @unirep/crypto @unirep/circuits @unirep/contracts @unirep/core

• yarn

yarn add -D @unirep/crypto @unirep/circuits @unirep/contracts @unirep/core

In the following example, we use hardhat as the ethereum environment.

See how to create a hardhat project at: hardhat.org