Blockchain

Bitcoin Core v30 shipped on October 10, 2025 raising the OP_RETURN standardness limit from 83 bytes to 100,000, and the fallout ran through 2026 — Bitcoin Knots climbing past 21 percent of listening nodes, Nick Szabo advising against upgrading, and a genuinely useful public argument about what node software is for. This course uses that fight to teach how Bitcoin actually governs itself.

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