> For the complete documentation index, see [llms.txt](https://corpus-core.gitbook.io/pap-colibri-stateless/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://corpus-core.gitbook.io/pap-colibri-stateless/the-problem/privacy-as-a-first-class-primitive.md).

# Privacy as a First-Class Primitive

## Failure of Trust-Based Privacy

Privacy solutions that rely on trusted intermediaries exchange one observation point for another. The RPC provider is replaced by a VPN operator, proxy, or relay — entities that observe the same request data under different commercial and legal circumstances. Whether these parties behave correctly, refrain from logging requests, or decline to correlate user activity cannot be verified.

These approaches therefore contradict the core design principle of blockchain systems: the elimination of required trust in third parties. Privacy mechanisms that require trust reintroduce exactly the dependency that trustless systems are designed to avoid.

## Privacy and Verifiability

Privacy cannot be treated as an isolated feature. In a trustless system, it must coexist with verifiability.

Verifiability ensures that retrieved data is correct, that state transitions are valid, and that no external party can manipulate results. Privacy ensures that access patterns are not exposed, that user intent is not observable, and that behavior cannot be reconstructed externally.

If privacy is achieved by hiding data behind a trusted service, verifiability is lost. If verifiability is achieved by exposing all data and access patterns, privacy is lost.

A valid Web3 architecture must provide both privacy and verifiability without introducing new trust assumptions. A system that sacrifices either property is no longer aligned with the trustless model.

## Requirements

From this constraint, three requirements emerge for any viable privacy model in Web3:

**Trustless**\
The system must not rely on trusted intermediaries. Any privacy mechanism must be compatible with independent verification and must not require assumptions about the behavior of infrastructure providers.

**Adaptive**\
Privacy requirements differ by context. A routine balance check and an institutional trade do not carry the same risk profile. A uniform level of protection is either excessive for low-risk operations or insufficient for sensitive ones.

**Resource-efficient**\
The solution must operate within realistic constraints. It must be usable in browsers, mobile environments, and resource-constrained devices. High overhead in computation, bandwidth, or latency makes a solution impractical.

These requirements define the design space for privacy in Web3. They exclude both purely trust-based approaches and purely theoretical maximalist solutions, and instead point toward adaptive, verifiable mechanisms.