Start with the protocol
The 2008 white paper described a peer-to-peer payment system using proof of work. Bitcoin.org places the first specification and software proof of concept in 2009. These references explain the starting point; they are not evidence for modern hardware performance or returns.
Hardware brings site requirements
Manufacturer documents make the physical side visible. BITMAIN’s August 2018 S9 Hydro announcement is a dated example of liquid-cooled hardware. The February 2025 S21 Hyd. manual provides a later operating reference. Neither date should be read as the invention date of liquid cooling.
Energy becomes a research subject
The U.S. EIA’s 2024 publication examined how cryptocurrency mining electricity use could be estimated. Read its scope and uncertainty before reusing any numbers. This timeline links the original publication instead of turning a historical estimate into a present-day counter.
Read all selected milestones
- 2008 / The white paper
A proposal for peer-to-peer electronic cash and proof of work.
Bitcoin white paper · 2008 - 2009 / The software starting point
Bitcoin.org records the first specification and proof of concept in 2009.
Bitcoin.org · Frequently asked questions - 2018 / A liquid-cooling example
BITMAIN announces S9 Hydro in August. One documented product milestone, not the origin of liquid cooling.
BITMAIN · S9 Hydro announcement · August 2018 - 2024 / Measuring the energy question
EIA publishes a study of cryptocurrency mining electricity consumption and estimation methods.
U.S. EIA · Mining electricity research · February 2024 - 2025 / System-level operation
The February S21 Hyd. guide documents model-specific operating requirements.
BITMAIN · S21 Hyd. user guide · February 2025
Go back to the source.
Bitcoin white paper · 2008 ↗Bitcoin.org · Frequently asked questions ↗BITMAIN · S9 Hydro announcement · August 2018 ↗U.S. EIA · Mining electricity research · February 2024 ↗BITMAIN · S21 Hyd. user guide · February 2025 ↗Editorial source review: 2026-09-08. Refer to the exact model manual and current source terms.