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I'm not sure that there's a release date for the SMT per se. People have already started adopting the SMT concept into their website like @Appics for example https://appics.com/ so you can look forward to the release of that later this year.

I just learnt about Patagonics here https://steemit.com/smt/@albertogm/patagonics-a-mining-token-powered-by-steem

And you can follow me as I write summaries about the SMT whitepaper here https://steemit.com/smt/@toni2oni/smt-whitepaper-summary-part-1

I could be wrong. According to the comment before this one by @dannyzen, SMT may not exist yet. Still trying to clarify this.

Yeah it has been announced today they will be available on September 25th!!!!

https://steemit.com/steem/@steemitblog/steem-velocity-hardfork-hardfork-20