The "D" parameter was a key mechanism in Cardano's transition from a centralized to a decentralized blockchain. Initially, block production was controlled by the network's founders. Starting in July 2020, the "D" parameter gradually reduced this control by 2% every five days, allowing more stake pool operators to participate. By March 31, 2021, the parameter reached zero, signifying full decentralization. The parameter was completely removed in the September 2022 Vasil upgrade, solidifying Cardano's commitment to decentralization.
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