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!
The legality of bitcoin is what would matter first and this is jurisdictional based. If it has been legalized where you are then you can do what you like with bitcoin though within the confines of the law as it is enshrined, otherwise, you can't practice such sell.