Design objective DO4: Five-year storage of transaction data
Data on business relationships and transactions must be stored at least five years on the local database of one of the contracting parties or on the blockchain, which allows for shared access.
Source paper
This design objective is proposed by Know-Your-Customer (KYC) Requirements for Initial Coin Offerings: Toward Designing a Compliant-by-Design KYC-System Based on Blockchain Technology (Nadine Kathrin Ostern, Johannes Riedel, 2021).