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22. Block Context & Nakamoto Fast Blocks

Chain metadata, block-height, and fast block execution.

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Contracts read consensus variables like `block-height`, `burn-block-height` (Bitcoin block height), and `stacks-block-time`. Stacks Nakamoto enables fast block confirmations while settling on Bitcoin.

clarity
(define-read-only (is-mature (start-block uint))
  (>= burn-block-height (+ start-block u100)))

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  1. 1. What does burn-block-height represent?

  2. 2. What major performance advancement did the Stacks Nakamoto upgrade deliver?

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