GSN-Based metacoin.

This a basic metacoin, with minimal modifications to support working through GSN, without the client paying for gas. You still need a wallet, but only for signing transactions, not paying for them.

See https://github.com/opengsn/gsn for the GSN project.

The Metacoin itself pays for all transactions.

Other than supporting GSN, the project added links to tenderly and etherscan, to ease seeing the various components on the blockchain

Running the project

The "TL;DR"

1. Run npm install
2. Run npm run ganache to run local ethereum node
3. In another terminal, Run npm run dev-with-gsn to run metacoin demo on http://localhost:8080

The longer version

1. Run 1 and 2 as above.
2. Run npx gsn deploy-relay-hub - deploys and configures the RelayHub.sol contract and its dependencies.
3. Run npx gsn fund-paymaster - Deposits funds in RelayHub for the paymaster's balance so it can be charged later for the relayed transactions.
4. In another terminal, run npx gsn run-relayer --DevMode --Workdir <workdir> --RelayHubAddress <address> where workdir could be any temporary dir i.e. /tmp/server/ and hub address as output in 2.
5. Run npx gsn register-relayer - pings the relay url, stakes its manager address thus prompts it to register and serve user requests.
6. Run npx truffle migrate && npm run dev to deploy Metacoin.sol contract, webpack and run local site at http://localhost:8080.