https://blog.chain.link/chainlink-vrf-on-chain-verifiable-randomness/ https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.6/Oracle.sol
https://docs.casperlabs.io/tutorials/ https://github.com/matiasbn/luckyseven/tree/master/sts https://vino.dev/blog/node-to-rust-day-1-rustup/#day-1-installing-rust-with-rustup