BLOCKCHAIN-BASED ROLE-BASED ACCESS CONTROL FOR DISTRIBUTED CLOUD SYSTEMS

Abstract

This study presents a blockchain-backed Role-Based Access Control (RBAC) service for distributed clouds, addressing auditable authorization under multi-region latency and consistency constraints. Although end-to-end costs and tail impacts of permissioned ledgers in RBAC are under-quantified, the present study implements a multi-region deployment with Istanbul Byzantine Fault Tolerance (IBFT), batched commits, and an off-chain cache, with evaluation against centralized and event-sourced baselines, throughput reported in requests per second (RPS), and calibration via Expected Calibration Error (ECE) and Brier Score using multi-seed runs and moving-block bootstrap. At the target load, the candidate achieved 145.0 +/- 4.6 ms 95th percentile (p95) latency and 1008 +/- 13 RPS while meeting the 150.0 ms Service Level Objective at 1000 rps; the 99th percentile (p99) policy-update consistency lag measured 1750.0 +/- 150.0 ms. Connectivity remains the bottleneck. The parts are familiar; the sequencing is not, combining ledger finality with cache-assisted reads and bounded block intervals to narrow the gap to centralized designs under controlled failures. These findings indicate that tamper-evident auditing can be added with modest overhead for enterprise security operators planning multi-region cloud authorization.