README

project structure

• zokrates

  • contains files for setting up zero knowledge programs (trusted setup)
  • out folder contains generated files (mounted by server in docker compose)
  • generates keypairs and verifier contract for use in contracts and server
  • run setup only once otherwise you need to start over and destroy access to generated zkp as keypairs used come from different trusted setup

• contracts

  • deployment of smart contracts
  • ganache blockchain for testing
  • deployment script to deploy contract for confidentialregistry and verifier
  • docker-compose for ganache and deployment (run-once) with truffle
  • ganache is run in deterministic mode

• server

  • backend for accessing blockchain
  • generates zkp
  • communicates with database

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prerequisites

• docker
• a good CPU
• about 7 GB of RAM reserved for docker
• docker/docker-compose (run server/database)
• node.js (used for scripts)
• npm (install dependencies)
• postman (use with postman collection)

requirement	tested version
docker	docker version 20.10.14, build a224086
docker-compose	version 1.29.2, build 5becea4c
node	v18.7.0
npm	8.18.0
postman	10.5.2

setup of local environment:

1. npm i in project folder
2. zokrates:
   • create folder mkdir out
   • generate setup: node with_salt/setup_keys.js
3. contracts:
   • docker-compose up -d
4. wait until bootstrap container has exited and written the config file to server/export/config.env
5. npm i in server folder
6. server: build server image and pull postgres image
   • run docker-compose up -d

! alternatively, you can use the bash scripts create, start, stop and remove (run before npm i in contracts and server to install npm dependencies)

! best is to use postman collection which displays information about requests/response

! for ease of use it is recommended to use the scripts invoked with node <scriptName.js>

using the enviroment:

1. zokrates: perform trusted setup (use create.sh or in zokrates: node with_salt/setup_keys.js)
2. use start.sh or run first docker-compose up -d in contracts and then docker-compose up -d in server
3. use registry api either with postman collection or scripts in scripts folder