It's not a fork of Bitcoin, it's a token on the platform. The BSOV token is a proof-of-work (PoW) mineable and deflationary token. A deflationary mechanism that destroys 1% of any transacted amount is embedded in BSOV's token contract. BSOV token are not burnt if they are held. The BSOV Community offers holders the chance to voluntarily timelock their BSOV token in the SovCube Timelocking Contract that will slowly release them back into the market.