$BTC I'm sorry, but I couldn't find specific information about a recent Bitcoin update involving a minimum of 100 countries. However, here's an overview of Bitcoin's legal status and adoption across various nations:

Legal Tender Status:

El Salvador: In 2021, El Salvador became the first country to adopt Bitcoin as legal tender, requiring businesses to accept it for goods and services.

Central African Republic: Following El Salvador, the Central African Republic also recognized Bitcoin as legal tender, aiming to boost its economy and financial inclusion.

Global Adoption and Regulation:

While only these two countries have declared Bitcoin as legal tender, many others permit its use under varying regulations:

United States: Bitcoin is legal and regulated, with the Financial Crimes Enforcement Network (FinCEN) issuing guidance as early as 2013.

European Union: The EU has not enacted specific legislation regarding Bitcoin's status as a currency but exempts it from VAT/GST when converting between traditional currencies and Bitcoin.

India: Investing in Bitcoin is legal, with platforms like WazirX allowing investments starting from as low as ₹100.

Countries with Restrictions or Bans:

Some nations have imposed restrictions or outright bans on Bitcoin: