There is no email required. There is no registration. You only need the private key and public key pair that was generated when you created your profile on whichever app that you're using. Keep this private key, sometimes called a secret key, safe. It unlocks your identity on Nostr applications. 

 Thank you. 

 P.S. call me dumb, but what is coracle and what is Nostr? Is Nostr part of the wider platform Coracle?? 

 Nostr is protocol, like email. Coracle is an application or platform that is built using the Nostr protocol. Nostr is a wide ecosystem of applications. Visit nostrapps.com to see more examples of what's available and being built with the Nostr protocol. 

 Gotcha. Thank you for explaining in simple terms! 

 😀 https://www.youtube.com/shorts/-M2ZOrjRXq4 

 Fantastic. Thank you! 

 Isn’t that amazing? 

 Welcome to the wonderful world of public key cryptography.  Your Nostr account is made of a mathematically related pair of very big numbers called a public key and a private key.  You public key is publicly available and peole can use it to verify that messages and posts you send actually came from you.  They can also use it to send you private messages.  Your private key is used to sign messages and read private messages.  Your private key is similar to a username/password.  It effectively is your account.  It can be used with any Nostr app to access your account, but make sure the app is trustworthy.  Keep your private key secret and back it up. 

 Thanks a lot. 

 As far as adding “str” to the end of a word, it’s just because it’s Nostr. There isn’t any deeper meaning, it’s the closest thing to a “trend” that exists here. 
Since there’s no algorithm to automatically sort and dispense information to you, we create our own categories and I suppose adding “str” was just something that someone started doing a couple years ago that people still do.
That’s not to say that, for example, you have to add it, as in #art , which is a perfectly valid hashtag. I hope I wasn’t confusing in that explanation . 

 Interesting. Thanks.