One good question raised up by
@No Mercy is about the proof of the value as most of the deals between collectors is through email or direct message on social networks.
I had a chat with
@VersusTime and he mentioned that an email exchange is a proof - email has to be printed out and signed by either the seller or buyer.
One message have to provide some details about the seller and buyer (I believe OF's nicknames won't be enough
)
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