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• Cross blockchain rates should be taken into consideration
• Iroha should prevent double spent of assets 
• Additionally to transferring assets, Iroha should mint and de-mint them

Simple scenario:

Image Added

@startuml
Buyer -> Iroha: Place Exchange Order(20ETH, 1BTC)
Seller -> Iroha: Place Exchange Order(1BTC, 20ETH)
Iroha -> "BTC bridge": Mint 1BTC to Seller
alt Success:
  Iroha -> Iroha: Transfer 1BTC from Seller to Buyer
  alt Success:
    Iroha -> "ETH bridge": Mint 20ETH to Buyer
    alt Success:
      Iroha -> Iroha: Transfer 20ETH from Buyer to Seller
    end
  end
end
@enduml

Liquidity Pool Scenario

Liquidity Pools is another dimension in this set of scenarios for Decentralized Exchanges. Basically it can be used in pair with or without bridges, so let's take a more clean example without them.

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