Change Log

Index Changes

The CBECI follows the semantic versioning guidelines available at The two latest versions (excluding patches) will be maintained by the team, with the dataset available for download below. 

 v1.1.1 – 05 Oct 2021 09:00 GMT

Updated equipment list (available here) with pre-ASIC hardware models to retrospectively extend the CBECI model to the previously-missing period from July 2010 to June 2014, which was necessary to calculate the monthly and cumulative electricity consumption.

Download data in csv format


V1.1.0 – 15 Jul 2021 09:00 GMT 

Refined best-guess estimate with the retrospective inclusion of Antminer S7 & S9 distribution provided by Coin Metrics.

Download data in csv format


V1.0.5 – 10 Jun 2021 08:00 GMT 

Updated equipment list (available here).  

Download data in csv format 


V1.0.4 – 17 Feb 2020 08:00 GMT 

Prospective change of data source for daily network hashrate, difficulty, mining revenue (issuance + fees), and bitcoin market price from to Coin Metrics.


V1.0.3 – 04 Dec 2020 08:00 GMT 

Updated equipment list (available here).


V1.0.2 – 08 May 2020 08:00 GMT 

Updated equipment list (available here).


V1.0.1 – 29 Dec 2019 08:00 GMT 

Updated equipment list (available here).


V1.0.0 – 02 Jul 2019 08:00 GMT 

Index launch.

Website Changes 

19 Oct 2021 15:30 GMT

CBECI > Mining Map: minor update of the Discussion section on the Methodology page to include a reference to the effects of the Chinese government crackdown on the local mining industry.

13 Oct 2021 07:30 GMT

CBECI > Mining Map: updated mining map with data from May 2021 until August 2021 included. Added a new chart showing absolute hashrate evolution of countries. Excluded Macau SAR and Hong Kong SAR from China provincial hashrate, renamed China to “Mainland China”, and updated both map and chart accordingly. Added a disclaimer for Germany and Ireland share. Moved Chinese provincial hashrate chart to a new section titled "Historical findings”.

05 Oct 2021 08:00 GMT

CBECI > Index: now displaying historical daily network power demand (in gigawatts) in the main chart instead of annualised consumption (in terawatt-hours), and showing continuous data points starting from July 2010. Added a new separate chart depicting the estimated monthly and cumulative electricity consumption of the Bitcoin network. Update of corresponding methodology section.

CBECI > Comparisons: added assumption about conversion loss during the energy transformation process to the energy comparison.

15 July 2021 08:00 GMT

CBECI > Index: refined best-guess estimate with the integration of the estimated hashrate share of Bitmain Antminer S7 and S9 equipment from Coin Metrics. The methodology section has been updated accordingly.

CBECI > Comparisons: complete revision of webpage with new data and text.

CBECI > Mining Map: updated mining map with data from May 2020 until April 2020 included. Replacement of Microsoft PowerBI map with custom chart. Addition of new time series charts. Update of corresponding methodology section.

CBECI > About: updated website structure with new umbrella section ‘About’ which now contains the ‘FAQ’, ‘Contact’, and ‘Change Log’ pages. Change Log includes previous index versions. FAQ have been fully updated.

21 May 2021 15:57 GMT

CBECI > Index: replaced 30-second network power estimate with 24-hour intervals due to unreliability of input data (real-time hashrate estimate). The methodology section has been updated accordingly.

20 May 2021 20:25 GMT

CBECI > Index: power estimates have been temporarily removed due to an issue with a data input source. The issue is under investigation and will be fixed as soon as possible.

19 Mar 2021 13:12 GMT

Mining Map > Visualisation: updated disclaimer.

17 Feb 2021 08:30 GMT

CBECI > Methodology: The data source for daily network hashrate, difficulty, miners revenue (issuance+ fees), bitcoin market price has been changed from to Coin Metrics. We retain as data source for the real-time hashrate estimate.

11 Feb 2021 21:49 GMT

CBECI > Comparisons: updated data source for country ranking (U.S. Energy Information Administration, 2019).

Cambridge Centre for Alternative Finance ©  2021