Building Blockchain Projects

Prerequisites

Before you start building the wallet service, make sure that you are running the geth development instance, which is mining, has the HTTP-RPC server enabled, allows client-side requests from any domain, and finally has account 0 unlocked. You can do all these by running this:

    geth --dev --rpc --rpccorsdomain "*" --rpcaddr "0.0.0.0" --rpcport "8545" --mine --unlock=0

Here, --rpccorsdomain is used to allow certain domains to communicate with geth. We need to provide a list of domains space separated, such as "http://localhost:8080 https://mySite.com *". It also supports the * wildcard character. --rpcaddr indicates to which IP address the geth server is reachable. The default for this is 127.0.0.1, so if it's a hosted server, ...