Difficulty Adjustment is a card from OPP Series 4 - The Simulation, part of Bitcoin Trading Cards, a collector line that borrows its scarcity model straight from crypto. Artwork comes from Nico. Within the 147 card checklist, this one is number 8. Across the set's parallels it appears in 5 variants.
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Every 2016 blocks, Bitcoin automatically adjusts its mining difficulty to keep block creation steady at an average of ten minutes. If miners join or leave, the network recalibrates - ensuring fairness, steady supply issuance, and perfect rhythm without central control.