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how clients and freelancers gonna top-up and cash out their DEV tokens onto/from freelance platform?
Crypto and fiat. It's written in our Whitepaper

I do not think freelance needs blockchain technologies. All the same, to resolve disputes, smart contracts can not yet be applied due to the complexity of the matter
Why not? I work as a freelancer sometimes. So I'd accept crypto payment

The only remark is that I'd prefer some popular and prospect cryptocurrency like BTC and ETH.
And may be this coin will be stronger and better than BTC and ETH in future. Who knows?

Thanks for the kind words!
To all others:
thanks for your support!