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Yes the token is used in our network. The DEX is just a means of exchanging Zephyr for other currencies. We are using a % of Bitspark transaction fees (separate to Bitshares fees, usually 1-2 % per transaction) to buyback zephyr from the DEX, so the more zephyr that is issued for successful transactions and other interactions in our network, the more buybacks that will also take place ensuring there is always a healthy market for Zephyr and positive upwards price pressure.

Please see Whitepaper for full explanation ;)

Thanks for your explanation.
I'm still wondering the usage/role of Zephyr in this network. For example, ETH can be used as fuel in Ethereum; Steem can be converted to Steem Power for more influence.

Zephyr is a reward for users undertaking things which benefit the growth of Bitspark remittance network. As bitspark grows so does the Zephyr's usage. This is not like Ether or Steem as they are actual blockchains and have fees payable to the blockchain, we are already using Bitshares and not building our own blockchain, this is a reward ontop of an existing Blockchain.

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