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Is there any entity in the blockchain that maintains record and manages public/private key pairs of all the users?
Is there any central management of public and private key pairs in blockchain?
Answers
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No, there isn't. Bitcoin has no central management of anything at all.
Public keys are pseudonymous and in general it may not be possible to identify the user to whom a public key belongs. A private key is kept by the user who generated it, and typically is never revealed to anybody else.
related: At what point is a new wallet known by the Bitcoin network?
– Murch – 2017-03-19T13:10:55.323