What is the original source of data for Bitcoin's value?

full image - Repost: What is the original source of data for Bitcoin's value? (from Reddit.com, What is the original source of data for Bitcoin's value?)

To clarify: exactly where do exchanges like Binance and Coinbase get their information about the current value of Bitcoin.Do other cryptocurrencies have the same source, and if not why not?

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Mining:
Bitcoin, Cryptotab browser - Pi Network cloud PHONE MINING
Fone, cloud PHONE MINING cod. dhvd1dkx - Mintme, PC PHONE MINING

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Exchanges:
Coinbase.com - Stex.com - Probit.com

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Donations:
Done crypto