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Obelisk is a new project the developers of Sia have been teasing. Nobody (except the dev team) knows what it's about yet.
More information about Obelisk will be gradually released during the week of 19 to the 23rd of June. Lead developer David has promised that by the end of Friday everyone will know what Obelisk is all about.
All currently available information has been leaked through the #obelisk channel in the Sia Slack community (see the sidebar for a link to join the Slack).
On Sunday the 18th of June lead developer taek posted a strange logo in the Slack community, with the filename “obeliskComingSoon.png”.
Monday the 19th of June a larger image was posted by Zach Herbert in the #announcements channel with the title “Coming soon. #obelisk” (this is the image at the top of this article), along with a link to a new Slack channel #obelisk. David then proceeded to release some subtle hints in that channel, which are logged below under the hints header.