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I am working on project .i have a functionality where user can submit bitcoin to my wallet .and after submitting bitcoin a payment page will open and user will fill payment details e.g his/her bitcoin wallet address and transaction hash.
Problem
if two user (A and B ) .
(A is valid user and submit true details) and
B is fake user but submit the same details as User A
A submit the bitcoin from wallet 12345.
B saying he also submit the same bitcoin with same wallet address .
How we will verify which user is authentic.
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