I'm wondering if I can open up a local shop and sell bitcoins for cash without paperwork or signing anything. Sure a bitcoin ATM can fulfill that role but as a shop I could do other things such as sell bitcoin merch etc, offer information on bitcoin and cryptos etc, but primarily I'm wondering if I can sell bitcoin for cash without hassling customers with paperwork. I suppose the laws would be the same for an ATM machine? which I haven't heard to be of a legal problem. I'd be considering doing this in Texas, USA, by the way. Any references or shared knowledge would be great, and I'm less interested in speculation. Thanks!