I see that there is a smart contract in the Solidity docs: https://solidity.readthedocs.io/en/develop/solidity-by-example.html#safe-remote-purchase https://sol

I see that there is a smart contract in the Solidity docs: https://solidity.readthedocs.io/en/develop/solidity-by-example.html#safe-remote-purchase https://solidity.readthedocs.io/en/develop/solidity-by-examp... Doesn't mean it is bullet-proof, but certainly good enough for trying out.