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