Blockstream launched Simplicity on the Liquid Network, enabling smart contract programability on Bitcoin’s infrastructure.
According to a July 31 announcement, the idea was first proposed in 2017 by researcher Russell O’Connor. Simplicity was designed as a clean-slate smart contract language that is more expressive than Bitcoin Script yet tighter and safer than general-purpose platforms.
With this launch, developers gain a new venue to build financial applications on Bitcoin’s rails.
The announcement noted that Simplicity differs from languages like Solidity or Rust, as it is not Turing-complete.
Programs describe finite functions, exclude unbounded loops, and avoid global mutable state. Those constraints are deliberate, aiming to enable static analysis so every execution path and fee cost can be known in advance, support formal verification, and favor compact programs that can be accelerated with implementation “jets.”
The objective is predictable behavior for contracts that secure real value, rather than open-ended computation that invites hidden edge cases.
The feature arrives on Liquid in an alpha phase, which Blockstream frames as a pragmatic stepping stone to a wider rollout.
The announcement stated that demand for Bitcoin programmability is rising with broader adoption, and Liquid aims to provide a production environment to ship audited, high-assurance contracts.
High-level language
The firm also said that Simplicity can power covenants, vaults, and delegation schemes for enterprise controls. As a result, it enables market primitives such as cash-settled derivatives, pooled wallets, and even exchange logic that avoids platform tokens.
Since raw Simplicity is intentionally low-level, Blockstream is shipping a Rust-like high-level language, rebranded from Simfony to SimplicityHL, so developers can write readable contracts that compile down to the formally specified core.
Additionally, the roadmap highlighted that the next primary goal is activation on a Bitcoin test network, keeping experimentation off mainnet while steering the ecosystem toward verifiable, resource-bounded smart contracts.
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