About UXSTM

Overview

UXSTM — Universal eXtensible STack Machine is a next-generation stack architecture built on UXSISC (SISC) as its baseline ISA. UXSTM is designed as a native hardware substrate for stack semantics across modern runtimes and protocol-validated execution environments, including smart contracts.

UXSISC — Universal eXtensible Stack Instruction Set Computer defines a stack-native ISA and a processor class aimed at eliminating structural overhead that occurs when stack execution models are forced onto register-centric architectures. In SISC, the stack is established as a first-class architectural interface rather than a secondary abstraction reconstructed by compilers or JIT translators.

UXSTM targets three priority domains: acceleration of mainstream stack VMs (primarily JVM, WebAssembly, and EVM), acceleration of blockchain execution (including native EVM execution), and scalable AI/HPC through ISA- and microarchitecture-level extensibility.

UXSTM-processor can be realized across multiple deployment forms: as an on-die coprocessor integrated into x86/Arm/RISC-V SoCs, as a PCIe accelerator for server and edge offload, as a standalone processor (CPU), as an MCU-class core for embedded, and as a CXL-device.

Why it matters

  • Alignment with dominant execution models. Major stack VMs are formally stack-defined.

  • Reduced translation overhead. A stack-native ISA can map common stack effects more directly, reducing the structural cost of reconstructing stack semantics through register-centric pipelines in interpreters and JIT lowering.

  • More predictable VM performance. Treating the stack as an architectural interface enables tighter control of hot operands and reduces implicit reshaping, improving determinism at the VM boundary.

  • Extensibility without breaking the model. Domain accelerators can be introduced as orthogonal extensions over a stable stack execution contract.

Workloads

1) Stack VM acceleration

UXSTM targets stack bytecode ecosystems where the operand stack is the execution interface:

  • JVM.

  • WebAssembly (Wasm).

  • EVM.

  • Other stack VM.

Additional stack-native contract environments:

  • TON TVM.

  • Algorand AVM / TEAL.

  • Tezos Michelson.

  • Bitcoin Script.

2) Blockchain execution targets

UXSTM accelerates blockchains by accelerating their execution surfaces:

EVM execution surface (EVM bytecode)

  • Ethereum

  • BNB Smart Chain

  • Polygon PoS

  • Avalanche C-Chain

  • Celo

  • Arbitrum

  • Optimism / OP Stack

  • Base

  • Gnosis Chain

Wasm execution surface (WebAssembly modules)

  • NEAR

  • EOSIO

  • Casper

  • CosmWasm ecosystem (Cosmos SDK)

  • Substrate pallet-contracts (Polkadot ecosystem)

  • MultiversX

  • Filecoin FVM

  • Internet Computer (ICP)

  • Stellar Soroban

3) AI & High-Performance Compute

AI/HPC is treated as an ISA and microarchitecture extensibility track:

  • scalable vector/tile primitives for data-parallel and tensor-like kernels,

  • mixed precision and integer-heavy pathways for inference,

  • cryptography and wide-integer primitives as a system foundation for blockchain throughput.