You want to trade a lot of fund (bitcoin), where you are holding that? Is it possible to sign a message to prove you are the owner of that address and the amount of bitcoin?
Hi Big Master, I act as a broker, which means I connect you with professional sellers or buyers as your self. This means that we let undergo all our clients proof of coin, funds and arrange full security during and after the transactions.
We try to keep all trades as unanimous as possible with the methods available at current market situation. I hope I have answered your question well, hope to hear from you.
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