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Blockchain emerged as a solution for data integrity, non-repudiation, andavailability in different applications. Data sensitive scenarios, such asHealth Care, can also benefit from these blockchain properties. Consequently,different research proposed the adoption of blockchain in Health Careapplications. However, few are discussed about incentive methods to attract newusers, as well as to motivate the system or application usage by existingend-users. Also, little is discussed about performance during code execution inblockchains. In order to tackle these issues, this work presents thepreliminary evaluation of TokenHealth, an application for collaborative healthpractice monitoring with gamification and token-based incentives. The proposedsolution is implemented through smart contracts using Solidity in the Ethereumblockchain. We evaluated the performance of both in Ropsten test network and ina Private instance. The preliminary results show that the execution of smartcontracts takes less than a minute for a full cycle of different smartcontracts. Also, we present a discussion about costs for using a Privateinstance and the public Ethereum main network.

Performance and Cost Evaluation of Smart Contracts in Collaborative Health Care Environments