Rinkeby Relay
git clone https://github.com/ConsenSys/rb-relay.git
npm link
you have to create a secrets.json in the root of the project that looks like this:
{"mnemonic": "put your twelve word seed in here so you can sign transactions"}
Relay headers from Rinkeby to Ropsten
rbrelay start
Your wallet must have funds on the destination chain (ropsten)
Relay a TX from rinkeby to ropsten
rbrelay tx 0x906a8ed7932dea662f1062414e8e558d49b52d1cfb56097247ca123aa4b64261 0x5e8ef53f0fde5347ce873deb9dddfbf7b3411b5b
Later we can relay receipts, account state, and storage variables