Blockchain applications ensure data integrity through their decentralized, immutable nature. Each transaction or entry is recorded in a distributed ledger that is secured with cryptographic techniques, making alterations nearly impossible without consensus from network participants. This transparency fosters trust, as all parties can independently verify data without a central authority. Additionally, blockchain facilitates traceability, ensuring stakeholders can audit transactions and track data provenance. Such features are particularly beneficial in industries like supply chain management and finance, where trust and security are critical to effective operations and compliance.