Twitter boss Jack Dorsey sold his first tweet as an NFT for just over US$2.9 million dollars on Monday.The tweet is in the form of a non-fungible token (NFT) – a kind of unique digital asset that has exploded in popularity so far in 2021.Each NFT has its own blockchain-based digital signature, which serves as a public ledger, allowing anyone to verify the asset’s authenticity and ownership.The tweet – “just setting up my twttr” – was Dorsey’s first tweet, made on March 21, 2006.This is not just…

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