bc1qrzf8ffd9kjagqk5vu6j0g2rqdd270qnkxcnys2sent tobc1ql4mfu6aundtkksxklfajs2h3t9nzcd6gyqjlte2026-09-07·#965,940·view on mempool.space Hackers name is Christopher William Cook CIO of Blockstream google natinfosec substack