Construction projects depend heavily on coordination, yet trust among stakeholders is often missing. While software is common in the industry, reliance on a single central database creates a single point of failure. An administrator can silently edit or delete records, leaving no evidence of the change. This work investigates how to secure data integrity in such environments without slowing down daily operations. The proposed system uses Hyperledger Fabric but adapts it for practical performance. Storing massive BIM files directly on a blockchain is not feasible. Instead, a hybrid approach keeps the heavy files in a standard database while locking the security on the ledger.