Bitcoin has a fixed supply of 21 million coins.

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Self-Regulatory Organizations; MEMX LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Exchange Rule 19.3, Criteria for Underlying Securities, To List and Trade Options on the Grayscale Bitcoin Trust, the Grayscale Bitcoin Mini Trust, and the Bitwise Bitcoin ETF. (2024). federalregister.gov. https://www.federalregister.gov/documents/2024/12/26/2024-30779/self-regulatory-organizations-memx-llc-notice-of-filing-and-immediate-effectiveness-of-a-proposed

Self-Regulatory Organizations; Nasdaq PHLX LLC; Notice of Filing of Amendment No. 1 and Order Granting Accelerated Approval of a Proposed Rule Change, as Modified by Amendment No. 1, To List and Trade Nasdaq Bitcoin Index Options. (2026). federalregister.gov. https://www.federalregister.gov/documents/2026/05/28/2026-10537/self-regulatory-organizations-nasdaq-phlx-llc-notice-of-filing-of-amendment-no-1-and-order-granting