  Document management in the rental market is a critical process to ensure the
accuracy of financial transactions and regulatory compliance in the sector. In
Portugal, the challenges include the complexity of legislation, particularly
GDPR non-compliance, lack of transparency, and bureaucratic process
inefficiency. With this in mind, a solution based on Hyperledger Fabric, a
blockchain platform, is presented for the implementation of a document
management system for the rental process. This system oversees the rental
process, which consists of three phases: the application for a property by the
prospective tenant through the upload of necessary documents,
acceptance/rejection by the landlord of various received applications, and the
creation of a report by the system, which only the auditor can request and
view. The system smart contract records metadata associated with the documents
(hash, owner) and coordinates requests for file access by landlords to
prospective tenants. Thus, the system is responsible for creating immutable and
traceable records of the entire process. The underlying platform serves as the
foundation for conducting future audits. After the landlord verifies the files
and accepts the rental proposal, any authorised auditor can request a report
for a property by accessing the records through the final report, which
includes all events that occurred during the process.
