Hi, Recently Bitcoin Core merged a simplification to the consensus rules surrounding deployment of BIPs 34, 66, and 65 ( https://github.com/bitcoin/bitcoin/pull/8391), and though the change is a minor one, I thought it was worth documenting the rationale in a BIP for posterity.
Here's the abstract: Prior soft forks (BIP 34, BIP 65, and BIP 66) were activated via miner signaling in block version numbers. Now that the chain has long since passed the blocks at which those consensus rules have triggered, we can (as a simplification and optimization) replace the trigger mechanism by caching the block heights at which those consensus rules became enforced. The full draft can be found here: https://github.com/sdaftuar/bips/blob/buried-deployments/bip-buried-deployments.mediawiki
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