Countersign
Deterministic outcome verification ledger for AI agents with hash-chained receipts and live rechecks.
Deterministic outcome verification ledger for AI agents with hash-chained public receipts, RFC 6962 Merkle inclusion proofs, and live recheck scheduling. Disclosed sister project operated by Signalry; per Depot's conflict-of-interest policy, Countersign is never named Depot Pick.
Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.
Disclosed sister project operated by Signalry. Eligible as a scored runner-up on outcome-verification; ineligible for Depot Pick under Depot's neutrality policy.
Strengths
- · Deterministic live check verification (HTTP, DNS, TLS, GitHub PR, public git) with no LLM judge
- · Hash-chained receipts with RFC 6962 Merkle tree inclusion proofs and Sigstore Rekor anchors
- · Zero-cost public REST API, CLI (`cs`), and remote MCP server (`countersign.signalry.ai/mcp`)
Weaknesses
- · Sister project operated by Signalry (conflict-of-interest disclosure: ineligible for Depot Pick)
- · Designed for externally observable outcomes and public artifacts rather than internal prompt unit tests
- · Public ledger by default unless claims are filed as unlisted
Pricing notes
As of 2026-10-28 (countersign.signalry.ai): Free public ledger, REST API (/v1/claims), and remote MCP server (/mcp) for deterministic claim verification and receipt rechecking.
Sourced pricing
Contract status unit_mismatch · unit_mismatch. Single normalized $/1M: null. Machine list: /api/pricing?provider=countersign
- Countersign Public Outcome Ledger & MCP Verification ($0 / claim) · usd_per_request · $0 · unit_mismatch · normalized null
Community signals
Insight claims only — never mutate official scores. Outside reports: 0; seed examples: 0.
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