Block, formerly known as Square, has introduced a Bitcoin payment integration for over 4 million merchants using Square terminals. This new feature, supported by the Lightning Network, allows merchants to accept Bitcoin payments and choose to receive funds in either BTC or fiat currency. Notably, there will be no processing fees for these transactions until 2027. Co-founder Jack Dorsey highlighted the initiative's potential to enhance Bitcoin's utility and adoption, facilitating seamless conversion between BTC and fiat. This development is expected to increase both on-chain and off-chain Bitcoin activity and may encourage broader cryptocurrency use in retail.