In 2020, some major companies and institutions started to acquire bitcoin: MicroStrategy invested $250 million in $BTC as a treasury reserve asset,[46] Square, Inc., $50 million, and MassMutual, $100 million. In November 2020, PayPal added support for $BTC in the US.

In February 2021, $BTC market capitalization reached $1 trillion for the first time🙀 . In November 2021, the Taproot soft-fork upgrade was activated, adding support for Schnorr signatures, improved functionality of smart contracts and Lightning Network. Before, bitcoin only used a custom elliptic curve with the ECDSA algorithm to produce signatures.  In September 2021, bitcoin became legal tender currency in El Salvador, alongside the US dollar.In October 2021, the first bitcoin futures exchange-traded fund (ETF)🙂‍↕️ , called BITO, from ProShares was approved by the SEC and listed on the CME👍 .

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