You'll need a US VPN to sign up but once that's done you can use the service as normal. You also can't have had an account with the email address previously (just create a new account).
About Tidal:
Listen to music anywhere, any time, with TIDAL music. TIDAL offers high-fidelity CD sound quality, high quality video, expertly curated content and editorial, and unique artists experiences.
Thanks. My receiver supports Tidal streaming. Have always wanted to give it a go for a decent trial period.
edit*: Haha… just notice my vote has an American flag next to it, since I'm logged in using my American VPN :)