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jyap | 1 years ago (raw) | root | parent | reply | flag 
 Thanks! What is the check next to your name?
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5c508c34 | 1 years ago (raw) | root | parent | reply | flag 
 Great question

It is called a NIP-05 identifier, basically a way to verify your username

You can read more about it here: 

https://uselessshit.co/resources/nostr/#nip-05