Create an RGB contract or invoice
Issue a token or make an invoice, for either RGB line, on a Bitcoin test network. It runs offline in your browser with each line's own code: nothing is sent anywhere, and no keys are involved.
Test networks only. Early development, not for real funds. Each result depends on a secret generated here. Save it: without it you can't prove or spend what the seal holds.
Nothing is broadcast. The outpoint only has to exist on chain when the asset is used.