---
language: en
tags:
  - eigengram
  - kv-cache
  - fingerprinting
  - retrieval
license: apache-2.0
---

# Eigengram Protocol

Persistent KV cache semantic fingerprinting for large language models.

**Status:** Pre-release. Model assets coming soon.

The Eigengram Protocol defines the `.eng` binary format for Fourier-decomposed
KV cache fingerprints enabling cross-session, cross-model semantic retrieval.

- [GitHub](https://github.com/eigengram-org/eigengram)
- [Python SDK](https://github.com/eigengram-org/eigengram-python)
- [Specification](https://github.com/eigengram-org/eigengram-spec)