Next came the crucial part: the . Leo pulled up his wallet's "Receive" address on his phone and held it under the machine's red laser scanner. A satisfying beep confirmed the link. He then slid his crisp bill into the feeder. The machine whirred, processed the cash, and displayed the current exchange rate along with a small transaction fee .

He tapped "Get Started" on the touchscreen, and the machine asked for his . After a quick SMS verification , the screen prompted him to choose his action. He selected "Buy Bitcoin."

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Leo stood before the glowing in the corner of the local deli, feeling like a character in a spy thriller. He had a hundred-dollar bill in his pocket and a digital wallet app open on his phone, ready to bridge the gap between paper cash and the blockchain.