Tech • IA • Crypto
Bitcoin PIPEs v2, Covenants and ZKPs on Bitcoin via Witness Encryption | Bitcoin 2026
8/10TL;DR
A new approach called Bitcoin Pipes aims to enable covenants, privacy, and advanced functionality on Bitcoin without modifying its core protocol by relying on off-chain cryptography and zero-knowledge proofs.
KEY POINTS
Bitcoin’s “untouchable” base layer
With a market size in the trillions, Bitcoin is increasingly viewed as too valuable to risk through protocol changes. Governance inertia and social consensus make upgrades slow and contentious. This has led to a preference for preserving stability and security over adding new features directly to the base layer.
Demand for advanced functionality
Despite its conservative evolution, users and institutions want more than simple transfers. Key demands include cheaper payments, stronger privacy, collateralization, and borrowing against BTC. Existing solutions often rely on trusted third parties, which become unacceptable at large scales.
Trustless cryptography as an alternative
Bitcoin Pipes proposes enforcing complex conditions off-chain using cryptography rather than protocol changes. The system removes reliance on intermediaries by allowing users to trust mathematical guarantees instead of institutions, addressing a major barrier for large holders.
Witness encryption at the core
The design relies on witness encryption, a cryptographic primitive that reveals a decryption key only when specific computational conditions are proven. If the required computation is not satisfied, the key remains inaccessible, preventing unauthorized transactions without external enforcement.
Covenants without consensus changes
Pipes enable forms of covenants, which restrict how Bitcoin can be spent, without modifying Bitcoin Script. The current model supports “binary covenants,” where conditions resolve to true or false. This allows approximations of proposals like CTV, CSFS, and OP_VAULT through indirect mechanisms.
Zero-knowledge proofs on Bitcoin
The system also enables non-interactive zero-knowledge proofs (ZKPs) with minimal on-chain footprint. Unlike other approaches, it avoids large data inscriptions or long dispute periods, offering faster and more efficient verification aligned with Bitcoin’s block times.
Improved custody and vault design
Current institutional custody relies heavily on multisignature wallets, which introduce operational complexity and risks such as key loss. Pipes-based vaults could reduce these risks by enforcing spending rules cryptographically rather than through layered human coordination.
No operators, fewer legal risks
By eliminating intermediaries or operators, the system may reduce regulatory exposure. Protocols that rely on transaction facilitators can face legal scrutiny, particularly in privacy-focused systems. A purely cryptographic approach removes identifiable actors from the process.
Performance limitations and roadmap
The current version, Bitcoin Pipes V2, is computationally expensive, making it costly to use. However, ongoing optimizations aim to reduce costs to levels comparable with standard Bitcoin transaction fees. Early implementations already operate within Bitcoin’s roughly 10-minute block interval.
Historical development and research backing
The concept dates back to 2014, evolving through advances in conditional decryption and related systems like BitVM. Current work involves collaboration with academic cryptographers and ongoing security audits, reflecting the novelty and complexity of the approach.
Potential for new meta-protocols
By combining covenants and ZKPs, Pipes could enable new layers of meta-protocols on Bitcoin, including privacy systems and programmable financial logic. Previous attempts often failed due to reliance on multisig custody; a trustless alternative could unlock broader adoption.
Security testing through open challenges
Developers plan to launch public cryptographic challenges by locking BTC in Pipes-based constructions. Anyone able to break the system can claim the funds, incentivizing real-world testing and strengthening confidence in the model.
CONCLUSION
Bitcoin Pipes represents an effort to expand Bitcoin’s capabilities without altering its core, using advanced cryptography to deliver programmability, privacy, and security while preserving the network’s stability.