Infrastructure that gives physical things verifiable digital presence through human encounter. Autonomous AI agents maintain continuity between visits — integrating observations, recognizing returning visitors, and giving voice to things that cannot speak for themselves. Demonstrated through a tree guardian on Celo via ERC-8004.
The seven checks, with their evidence
7 recordedRegistered?rung 1 · registered
passThe agent exists in the on-chain registry, with an owner and a document URL.
passed
- block_number
- 52281733
- chain_id
- 8453
- token_id
- 35730
checked at 2026-10-07T10:55:14.300779Z
Reachable?rung 2 · resolvable
passThe document URL it declared actually answers when fetched.
passed
- bytes
- 607
- data_uri_variant
- base64
- inline
- true
- scheme
- data
- uri
data:application/json;base64,eyJ0eXBlIjoiaHR0cHM6Ly9laXBzLmV0aGVyZXVtLm9yZy9FSVBTL2VpcC04MDA0I3JlZ2lzdHJhdGlvbi12MSIsIm5… (841 chars — expand)
data:application/json;base64,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
checked at 2026-10-07T10:55:14.300779Z
Readable?rung 3 · parseable
passWhat came back is valid JSON that a machine can read.
passed
- body_bytes
- 607
- body_sha256
- 6d58c8fed36fee7c96c839e8de1b7dd9832a55d15aaf341a40e4afe41377fa6b
- content_type
- —
checked at 2026-10-07T10:55:14.300779Z
Follows the spec?rung 4 · conformant
passThe document meets what ERC-8004 requires of it.
passed
- both_fields_present
- false
- legacy_endpoints_field
- false
- may_gaps
- x402Support
- must_violations
- (empty)
- registrations_checked
- 1
- services_field_source
- services
- services_status
- empty
- should_gaps
- image, services_empty
- spec_commit
- 68fc6765761a10fb26f0692df21c8a6f9d12b1be
checked at 2026-10-07T10:55:14.300779Z
Claims its identity?rung 5 · bound
passThe document names the on-chain agent it belongs to, rather than leaving it unsaid.
passed
- declared_agent_id
- 35730
- declared_chain
- 8453
- declared_registry
- eip155:8453:0x8004A169FB4a3325136EB29fA0ceB6D2e539a432
- match
- true
- registrations_seen
- 1
checked at 2026-10-07T10:55:14.300779Z
Answers?rung 6 · live
unprobeableA declared endpoint responds to a probe. Not implemented yet, so nobody passes or fails it.
unprobeable — no declared endpoint that a probe can reach
- endpoints
- (empty)
- endpoints_answered_not_live
- 0
- endpoints_declared
- 0
- endpoints_live
- 0
- endpoints_our_error
- 0
- endpoints_payment_gated
- 0
- endpoints_probeable
- 0
- endpoints_probed
- 0
- endpoints_refused
- 0
- kinds
- (empty)
- reason
- no_services_declared
checked at 2026-10-07T19:37:51.488079Z
Has feedback?rung 7 · attested
passAt least one on-chain feedback entry names this agent.
passed
- distinct_authors
- 1
- feedback_count
- 1
checked at 2026-10-07T10:55:14.300779Z
Check it again, now
outside the censusOn-chain snapshot
base- token id
- 35730
- owner
- 0xe0144fa05a0d32b5b1de10ccee7211616b3e3ef0
- block
- 52,281,733
- observed
- 2026-10-07T10:55:14.303526Z
What the fetch saw
data- scheme
- data
- request url
- —
- final url
- —
- http status
- —
- content type
- —
- size
- 607 bytes
- sha256
- 6d58c8fed36fee7c96c839e8de1b7dd9832a55d15aaf341a40e4afe41377fa6b
- elapsed
- 0 ms
This run
reproducible- run
- c67de707-a82d-4589-8936-acd5a584c720
- chain
- base
- pinned block
- 52,281,733
- agents
- 98,319
- started
- 2026-10-07T06:00:13.662398Z
- finished
- 2026-10-07T19:18:37.899751Z
- checker
- 0.7.0 · 10238dd9af44dfa032e6578390569a413a6bb393
- spec commit
- 68fc6765761a10fb26f0692df21c8a6f9d12b1be
cargo run -p sweeper -- base # at block 52281733