Attestix

Attestix, from VibeTensor, gives AI agents a verifiable identity and a tamper evident record of what they did. Each agent receives a decentralised identifier and a signed identity record before its first action, and every subsequent action is appended to a hash chained audit trail signed by the Attestix instance, so any later edit breaks the chain. Regulators, auditors or other agents can check that evidence themselves. It is built for teams running agents in regulated or accountable settings. Attestix connects to LangChain through a callback, and to CrewAI, the OpenAI Agents SDK, Claude Code and any MCP client through its MCP server, which exposes 47 tools across nine modules, including compliance tools and GDPR erasure. It builds on open standards: W3C Verifiable Credentials and Decentralized Identifiers, Ed25519 signatures, Merkle hashing and delegation modelled on UCAN. Credentials issued in Python verify offline in JavaScript, with verifier SDKs for Go, Rust, Java and R sharing the same test vectors, and a browser verifier uploads nothing. The open source release is free under Apache 2.0 and contains every cryptographic feature. Hosted plans add operations: Cloud Free is $0 with one capped workspace, up to 2 team members and 100 testnet anchors per month; Cloud Pro is $99 per month per workspace, uncapped, with up to 10 members and role based access, webhooks, EU or US data residency and email and Slack support; Cloud Enterprise is priced per deployment and adds SSO, SCIM, custom residency and an SLA. Self serve billing is not live yet. Cloud Free is a waitlist, the Pro price is described as the launch target, and customers are onboarded directly for now.