The signature byte is ‘M’ for all memory blocks except the last one, with the last block using a ‘Z’ signature. Perhaps ‘M’ stands for “memory” and ‘Z’ for “last” (block), or perhaps MZ are the initials of Mark Zbikowski, one of the core developers of DOS 2.0.
2 月 26 日，Afterpay 母公司 Block 的掌门人 Jack Dorsey 在 X 上发帖表示：“we're making @block smaller today。”
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Deepfake fraud drained $1.1 billion from U.S. corporate accounts in 2025, tripling from $360 million the year before. By midyear last year, documented incidents had already quadrupled the 2024 total. And most corporate communications and brand teams remain dangerously unprepared.
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