Getting Started

Just a few steps to spin up the Issuer!

1. git clone the Demo Issuer Repository

The prerequisites necessary to run the Demo Issuer are:

• Golang

• Ngrok

2. Setup a Public URL

To run the demo issuer we need to set up a publicly accessible URL. For that, we use ngrok

ngrok http 8001 

# Output -> https://ecd9-49-207-208-41.in.ngrok.io

3. Setup the config

Add the following variables inside the config file

demo-issuer/issuer/issuer_config.default.yaml:

• log_level parameter controls the amount of messages that are generated when running the issuer.

• db_file_path is the path to the DB file where the state of the issuer is stored (or will be stored)

• reset_db will reset the DB state of issuer on boot.

• node_rpc_urlis the url of an RPC endpoint that operates on Mumbai Test Network. You can generate one using Infura or Alchemy

• publishing_private_key is the private key of the wallet that will be used to execute any on-chain transactions. Ensure that the account associated with this private has enough test MATIC tokens.

You can use Metamask to create a new Wallet and use these Faucets (1 and 2) to get MATIC tokens for free by entering your address

• publishing_contract_address is the address of the contract that manages the state of the identity (in our case the demo-issuer)

• circuits_dir is the directory which all the required data related to zkp operations (proving/verification) is stored

• local_url is the url the HTTP API of the demo-issuer will run locally

• public_url is the ngrok public url obtained from the previous step

demo-issuer/issuer/issuer_config.default.yaml

log_level: TRACE   # TRACE/DEBUG/INFO

# DB
db_file_path: issuer.db
reset_db: true

# On-chain interaction
node_rpc_url: <mumbai-node-rpc>
publishing_contract_address: 0x46Fd04eEa588a3EA7e9F055dd691C688c4148ab3
publishing_private_key: <mumbai-private-key>

# Protocol specific information
circuits_dir: keys
ipfs_url: ipfs.io

# Hosting
local_url: 'localhost:8001'
public_url: https://cb4d-46-121-236-63.eu.ngrok.io

4. Start the Demo Issuer

Run the main.gofile to start the Demo Issuer

cd issuer
go run cmd/main.go

INFO[0000] boot up issuer service                       
INFO[0000] loading Configuration                        
INFO[0000] using config file: /Users/enricobottazzi/Documents/GitHub/demo-issuer/issuer/issuer_config.default.yaml 
INFO[0000] issuer config: &{INFO issuer.db keys https://a0cb-88-147-75-172.eu.ngrok.io localhost:8001 {30237d5b882221685f2926361ca7e81f1235d5faef02bcfbf99f459718bfd952 32} ipfs.io} 
INFO[0000] setting up logger                            
INFO[0000] creating DB                                  
INFO[0000] creating identity state                      
INFO[0000] processing secret key                        
INFO[0000] creating Identity                            
INFO[0000] spining up API server @localhost:8001        
INFO[0000] starting HTTP server (address: localhost:8001)