Platform neutral computation description language is a Layer 0 component.
Example EVM WASM * UTXO
Ethereum Virtual Machine (EVM) is the virtual machine executed on the Ethereum network.
WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable target for compilation of high-level languages like C/C++/Rust, enabling deployment on the web for client and server applications.
An unspent transaction output (UTXO) is an output of a blockchain transaction that has not been spent, i.e. used as an input in a new transaction. Bitcoin is the most famous example of a cryptocurrency that uses the UTXO model.
This section pertains the UTXO-based state machine of blockchains that Bitcoin-like.