In this white paper we explore the capabilities required to identify and study supermassive black holes formed from heavy seeds ($mathrm{M_{bullet}} sim 10^4 - 10^6 , mathrm{M_{odot}}$) in the early Universe. To obtain an unequivocal detection of heavy seeds we need to probe mass scales of $sim 10^{5-6} , mathrm{M_{odot}}$ at redshift $z gtrsim 10$. From this theoretical perspective, we review the observational requirements and how they compare with planned/proposed instruments, in the infrared, X-ray and gravitational waves realms. In conclusion, detecting heavy black hole seeds at $z gtrsim 10$ in the next decade will be challenging but, according to current theoretical models, feasible with upcoming/proposed facilities. Their detection will be fundamental to understand the early history of the Universe, as well as its evolution until now. Shedding light on the dawn of black holes will certainly be one of the key tasks that the astronomical community will focus on in the next decade.
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