Today, Cloud services are mainly traded on provider platforms such as on Amazon’s EC2 On-Demand marketspace. Thereby, consumers and providers neither negotiate the price nor the characteristics of the services. The recent years underpin a trend to more dynamic Cloud markets. So e.g. the Cloud provider Virtustream released a revenue model where consumers are charged based on consumed microVMs while Amazon extended its spot market with spot blocks and spot fleet management. Hence, multi-round bilateral negotiations are a promising approach for trading Cloud services on future Cloud markets. Such negotiations are based on an alternating exchange of offers and hence, they are termed Bazaarnegotiations. Specifications such as the WS-Agreement Negotiation - which is maintained by the Open Grid Forum - foster the development of Bazaar-based markets. To ensure integrity and transparency of negotiations with untrusted negotiation partners - which is a precondition for the adaption of Bazaarbased Cloud markets - blockchains are a promising approach. In this paper we introduce a concept of a blockchain for Bazaar-based negotiations whereby we assume that the offers exchanged during negotiations follow the structure defined in the WS-Agreement Negotiation specification. We implemented it within a CloudSim based simulation environment which is able to simulate such Bazaar-based markets to show its technical feasibility.

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