In recent years, blockchain has received more attention in different areas wheredifferent chains show unique properties. Society has been strongly affected by thegrowth of technology and digitalization. Despite the success, the banking system is ina stagnant state in the development of the transaction system. Smart contracts havemore significant potential to be used against blockchain. The contract does not requiremanual handling but could operate independently during all hours of the day. Inaddition, limit them by being applied solely to enable an overview of completedtransactions. A challenge seen with implementing the technology from the bank'sperspective is a new type of form of cooperation. If Ethereum succeeds in proving itselfin its Proof of stake model, there is great potential for a more significant part of thebanking industry to start using smart contracts. The purpose of the study was toinvestigate the effects of implementing smart contracts in a dynamic transaction systemover time. Data obtained from interviews and literature study was the basis formodeling the system. The study aimed to carry out simulations to then be able toevaluate the effects. According to the interviews, blockchain is seen more as a tool tosolve particular problems. The simulations show how the entities in the system areaffected over time when the technology smart contracts are applied.