The main idea is to decode the extrinsics data from a block (using ink! contracts)
https://paritytech.github.io/ink/#how-it-works
run the 'substrate-contracts-node' script by typing
./substrate-contracts-node --dev
https://docs.substrate.io/tutorials/get-started/build-local-blockchain/
Clone this repo 'https://github.com/paritytech/contracts-ui', install dependencies using
yarn
yarn start
While using the UI use the src/erc20/erc20.contract to deploy. Other contracts at https://github.com/paritytech/ink/tree/master/examples As this is a fresh new local node, generate some transactions.
npm i
npm run build
npm run start