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We reconstructed dark spots in the images of supermassive black holes SgrA*and M87* provided by the Event Horizon Telescope (EHT) collaboration by usingthe geometrically thin accretion disk model. In this model, the black hole ishighlighted by the hot accretion matter up to the very vicinity of the blackhole event horizon. The existence of hot accretion matter in the vicinity ofblack hole event horizons is predicted by the Blandford-Znajek mechanism, whichis confirmed by recent general relativistic MHD simulations in supercomputers.A dark spot in the black hole image in the described model is a gravitationallylensed image of an event horizon globe. The lensed images of event horizons arealways projected at the celestial sphere inside the awaited positions of theclassical black hole shadows, which are invisible in both cases of M87* andSgrA*. We used the sizes of dark spots in the images of SgrA* and M87* forinferring their spins, 0.65<a<0.9 and a>0.75, accordingly.

Spins of supermassive black holes M87* and SgrA* revealed from the size of dark spots in Event Horizon Telescope Images