METHOD FOR MAINTAINING INTEGRITY AND TRUST IN TRANSACTION PROCESSING RESULTS IN BLOCKCHAIN SYSTEMS WITH CRYPTOGRAPHICALLY VERIFIED RECORDING OF DECISIONS MADE

Abstract

The article develops and substantiates the method for maintaining integrity and trust in transaction processing results in blockchain systems with cryptographically verified recording of decisions made, aimed at ensuring evidentiary integrity, traceability of origin, and reproducibility of decision-making results without interfering with the basic consensus mechanisms of the network. The proposed approach considers the service decision as a reproducible engineering artifact and involves the formation of a structured record with fixation of the risk class, risk indicator, hash commitments for the feature vector, model versions and processing policy, timestamp, and cryptographical linking of the sequence of log records. Based on canonical serialization, a hash of the record is calculated, which is signed by a trusted service, while a minimal anchor of the decision is fixed in the blockchain transaction, which allows independent verification of immutability and authenticity. An audit procedure is proposed that includes recalculation of the hash, verification of the digital signature, and control of the integrity of the log history. Experimental verification was performed on the open Bitcoin Heist Ransomware Address dataset with chronological partitioning to prevent information leakage. Risk assessment was implemented using gradient boosting over decision trees with threshold optimization by F1-measure. The experimental results confirmed that all generated solutions successfully pass cryptographic verification, and any attempts to modify the solution content or violate the record binding are reliably detected during the audit. The obtained results demonstrate the suitability of the method for use in security-critical blockchain architectures, where a formally verifiable combination of off-chain analysis and on-chain commit is required. The method for maintaining integrity and trust in transaction processing results in blockchain systems with cryptographically verified recording of decisions made also ensures the traceability of solutions over time by fixing the versioning of the data used, models, and processing rules, which increases the manageability of security policies and the validity of the results during independent verification.