Show HN: PromptSign – Sigstore signing and verification for AI instruction files

Category: security

Tags: code-signing, sigstore, ai-security, prompt-security, supply-chain

Score: 6.3/10 (Innovation: 7, Technical: 6, Documentation: 4, Utility: 6)

PromptSign applies Sigstore-style keyless signing and transparency logging to AI instruction files (prompts, skills, agents), enabling verification of authorship and integrity. It addresses a growing supply-chain security gap in AI tooling by adapting established code-signing concepts to prompt artifacts.

Target audience: AI engineers, security engineers, platform teams deploying shared prompts/agents

Repository: https://promptsign.ai/

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