There is some info here: https://smt.steem.io
There are also a few posts about them if you scroll through the recent (past few months) of history of the @steemitblog account.
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There is some info here: https://smt.steem.io
There are also a few posts about them if you scroll through the recent (past few months) of history of the @steemitblog account.
Cheers, that link was really useful.