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https://bitcoinkey.io/garanteeWe offer our customers only valid official keys purchased directly from publishers or their dealers.
You say that all keys are official or have been purchased legally. Why should you only accept payment in BTC? Adding other methods such as PayPal, Visa, Mastercards, bank cards or any central payment method will contribute to trust.
I liked the website design, I was hoping that the purchase will be done directly and not a balance update, adding a lightning network, segwit, and others.