Constant-Size Accumulators Unlock Truly Stateless Blockchain Architecture ∞ Research

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Briefing

The core research problem is the critical state bloat that threatens the decentralization of blockchain networks by imposing prohibitive storage costs on full nodes. This paper proposes a foundational breakthrough ∞ novel batching techniques for cryptographic accumulators in groups of unknown order, which allows for the non-interactive aggregation of numerous membership proofs into a single, constant-sized witness. This mechanism fundamentally changes the storage complexity of a full node from being linear with the state size (O(N)) to a constant size (O(1)), providing the single most important implication of cryptographically guaranteeing the feasibility of a truly stateless blockchain architecture.

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Context

The prevailing limitation in decentralized systems is the “state problem,” where the set of all unspent transaction outputs (UTXOs) or account balances grows perpetually, demanding storage proportional to the network’s history. Before this work, authenticated data structures like Merkle trees offered logarithmic proof sizes (O(log N)), which was insufficient for achieving true statelessness, as nodes still required significant storage to verify the Merkle root and process proofs, creating a centralizing pressure on the network’s validating set.

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Analysis

The core idea is the development of a universal accumulator that operates without a trusted setup by leveraging groups of unknown order, specifically RSA groups. The new mechanism is a set of succinct proof systems that allow a prover to generate a single, constant-sized proof that simultaneously validates the inclusion or exclusion of a large batch of elements against the accumulator commitment. This fundamentally differs from prior approaches, which required a separate proof for each element or a proof size that grew with the logarithm of the set size, by using advanced zero-knowledge proofs of correct exponentiation to non-interactively aggregate these witnesses.

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Parameters

Node Storage Complexity ∞ O(1) – The required storage for a full node to participate in consensus is reduced to a constant size, independent of the total state size.
Membership Proof Size ∞ Constant Size – The aggregated proof for any number of elements remains fixed, enabling highly efficient on-chain verification.
Proof Verification Operations ∞ Constant Number – The verification of the aggregated proof requires a fixed number of group operations, independent of the batch size.

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Outlook

This foundational work unlocks a strategic roadmap toward ultra-lightweight, high-throughput decentralized systems. In the next 3-5 years, this primitive is expected to be integrated into next-generation blockchain state layers, enabling mobile devices to act as full validating nodes and eliminating the storage bottleneck for rollup state verification. The research opens new avenues for constructing highly efficient Interactive Oracle Proofs (IOPs) and developing more robust, decentralized public key infrastructure without relying on trusted intermediaries.

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Verdict

This cryptographic primitive is a decisive architectural breakthrough, resolving the long-standing state bloat problem and mathematically guaranteeing the path to fully decentralized, constant-storage full nodes.

Cryptographic Accumulators, Groups of Unknown Order, Stateless Blockchain, Constant Storage, Proof Aggregation, Batch Verification, Vector Commitments, Non-Membership Proofs, Succinct Proof Systems, Zero-Knowledge Proofs, Decentralized Storage, State Bloat Mitigation, Full Node Efficiency, Constant Time Verification, Universal Accumulator, RSA Accumulator, Public Key Infrastructure Signal Acquired from ∞ IACR ePrint Archive