At the beginning of Jihan Wu’s farewell letter, “—–BEGIN PGP SIGNED MESSAGE—–Hash: SHA512” appeared twice, and the end was also END PGP SIGNED MESSAGE, which was suspected to be using dual signatures to tribute to the Bitcoin double sha256 algorithm.

by Wu Blockchain
At the beginning of Jihan Wu’s farewell letter, “—–BEGIN PGP SIGNED MESSAGE—–Hash: SHA512” appeared twice, and the end was also END PGP SIGNED MESSAGE, which was suspected to be using dual signatures to tribute to the Bitcoin double sha256 algorithm. https://t.co/mUa3VYoV2D

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