Future Blockchain Infrastructures: Cross-Chain Interoperability, Privacy-Preserving Computation, and Decentralized Digital Trust
Main article
Abstract
Blockchain technology has evolved from a single-purpose cryptocurrency ledger into a foundational substrate for decentralized digital infrastructures spanning finance, identity, supply chains, energy, and healthcare. Yet three intertwined obstacles continue to constrain its next phase of maturation: heterogeneous chains rarely interoperate, on-chain transparency conflicts with confidentiality requirements, and centralized identity providers remain the de facto standard for digital trust. This review consolidates recent research into a single forward-looking framework organized around three pillars—cross-chain interoperability, privacy-preserving computation, and decentralized digital trust. Drawing on more than eighty studies indexed between 2015 and 2025, we examine architectural paradigms, cryptographic mechanisms, and deployment patterns; we analyze publication trends across the three pillars; and we synthesize comparative evaluations of notary schemes, sidechains, hash-locking protocols, zero-knowledge proofs, secure multi-party computation, homomorphic encryption, differential privacy, and self-sovereign identity. We argue that the next generation of blockchain infrastructure will be defined less by improvements within any single chain and more by the seamless composition of trustworthy, privacy-preserving services across heterogeneous chains, edge devices, and human users. A research agenda organized around scalable bridging, application-aware privacy budgets, regulator-compatible identity, and energy-conscious consensus is proposed.
