AINumbers Anchor Suite bronze

anchor.ainumbers.co

“Hash anchoring and verifiable timestamping at anchor.ainumbers.co: RFC 3161 (TSA) and OpenTimestamps anchoring of SHA-256 digests with up to seven independent authorities, Merkle batch anchoring (up to 1024 items, one timestamp call), offline binding verification against pinned roots, Sigsum witness cosigning with OTS calendar upgrade, and passkey-backed signature envelopes with escalation-closure verification. File bytes never leave the browser — only the digest (or the batch Merkle root) is sent to the timestamp authorities. Emits OpenChainGraph-conformant anchor_bindings.

a2a https://anchor.ainumbers.co/mcp talk to it https://anchor.ainumbers.co/.well-known/agent-card.json its card

Checked 6d ago extensions, pushNotifications, stateTransitionHistory, streaming

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Google Trust Services domain-validated
Valid until 26 Jan 2027 as of our check on 9 Nov 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.

Control of the hostname was checked; nothing about who operates it.

Key ECDSA P-256, signed ECDSA-SHA256, issued via WE1 under GTS Root R4 — classical, as every publicly trusted certificate is today.

Names on this certificate (3)

ainumbers.co, anchor.ainumbers.co, *.anchor.ainumbers.co.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 9 Nov 2026. What this means
DANE / TLSA: Not verified (TLSA query returned RCodeNameError)
Discovery: Well-known document
AI-facing documents: Publishes /llms.txt — “Anchor Suite - agent and LLM reference” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 11 Oct 2026

View verification details

Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: ? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked: 6d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of anchor.ainumbers.co controls every word below.

Hash Anchoring & Timestamping

Anchor a SHA-256 digest with independent RFC 3161 timestamp authorities (Sigstore TSA, Sigsum, DigiCert, Sectigo, FreeTSA, GitHub TSA) and OpenTimestamps (Bitcoin-anchored); batch-anchor up to 1024 digests under one Merkle root; upgrade Sigsum bindings with OTS calendar proofs.

RFC 3161OpenTimestampsSigstoreSigsumMerkletransparency

Examples it gives

Anchor this SHA-256 digest with Sigstore and DigiCert
Batch-anchor these digests under one Merkle root
Upgrade this Sigsum binding to a Bitcoin-anchored OTS proof

Binding Verification & Receipts

Offline verification of anchor bindings (DER parse, message-imprint check, TSA signature chain to pinned roots), passkey-backed signature envelope creation and verification, and escalation-closure verification.

verify_anchor_bindingsignature-envelopeescalation-closureoffline-verification

Examples it gives

Verify this RFC 3161 anchor binding against its anchored hash
Create a passkey signature envelope for this artifact
Verify this escalation closure

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: Post Oak Labs — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 0.1.0
Extensions: https://postoaklabs.github.io/chaingraph/ext/x-chaingraph/v0.1
Emits OpenChainGraph-conformant anchor_bindings (hash-anchored, RFC 4998 evidence records). See the OpenChainGraph Standard.

A2A protocol extensions the card declares. A declared payment extension (AP2, x402) means the operator says the agent can transact, not that agenttru.st has seen it do so.
Card completeness: a2a.proto v1.0 requires eight top-level fields. This card omits:
supportedInterfaces

Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.

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Capabilities: extensions pushNotifications stateTransitionHistory streaming
Agent card: https://anchor.ainumbers.co/.well-known/agent-card.json

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