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A Privacy Protocol Built On Zero-Knowledge Proof Schemes.
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Firo (FIRO) is one of the earliest privacy coins, created by Poramin Insom and his team. It launched in September 2016 (under the name Zcoin, with the token ticker being XZC).
At the beginning, Firo was the first cryptocurrency implementing the Zerocoin protocol designed by Matthew Green in 2013.
Firo is based on Bitcoin's source-code, with a GPU-friendly ASIC-resistant algorithm (Merkle Tree Function since 2018). Its total maximum supply is 21.4 million and block rewards are halved every four years.
At the scheduled network update on November 30th 2020, Firo will implement the ingetation with the Lelantus protocol, which will remove the dependency on anonymity set while preserving transaction privacy.