Nostr uses a public key system, where your identity is tied to a unique cryptographic key. You have full control over your identity without relying on a central authority. Nostr's protocol eliminates the need for Know Your Customer (KYC) processes. No email, ID, thumbprint, or eyeball scans required. Your privacy is entirely yours to safeguard.
Users sign their posts with their cryptographic keys in Nostr. This cryptographic signature ensures the authenticity of your data, and you maintain ownership over it. Each client validates these signatures, ensuring data integrity. Users select relays for data exchange, and relays communicate directly with users, not with each other.
In Nostr, you have full control over your audience. Users choose their preferred relay servers and can recommend relays to maintain their follower base, even if they switch relays. Additionally, users can mute other users, words, and contents (if the feature is available), shaping their social media feed according to their preferences.
You can publish anything you want as long as relays are willing to accept it. If no one accepts what you have to say you can easily run your own relay. Relays can ban some users from publishing to them, but if you have people that follow you can always find another relay to publish to and your follower clients should be capable of finding you there and continue to get your updates.
Nostr supports user anonymity. Users can choose to be anonymous or use pseudonyms without compromising their ability to participate. Nostr is also available On TOR that prevents tracking of users. Nostr does not have the capacity to provide user data to governments, safeguarding users' freedom of expression from prohibitions or restrictions.
Nostr encourages development and customization. Users are free to develop on the platform, contributing to the growth and evolution of the network. Anyone can build on Nostr, creating clients, relays, tools, and apps. Users have the freedom to establish payment methods for their features, providing developers with a potential source of revenue.
With Nostr there is not a central provider that give you an account, in fact your account is powered just by cryptography, and you could create one (or more!) yourself by hand, without any limit. But usually the easiest way is to use a Nostr app to bootstrap a new account and then use it everywhere.
An account is a key-pair. The private key (nsec) is your digital identity, if you lose or leak it, you are burned; so you need to keep your key-pair secure and private. Use a password manager, make a backup on paper and use it only in trusted apps. Never enter your nsec in a website, install a signer extension.
Nostr developers already have built several applications that cover different areas; probably the easiest way to start using Nostr and learn more is downloading a social client and start getting involved with the community and learn more. Need help? Use the #asknostr hashtag!
After you are familiar with the basic concepts you can explore other social clients and other Nostr applications; your already have your digital identity and it works everywhere, so you can simply login in using your nsec. As usual be sure that the app is from a trusted source!