Agent

Signal Horizon

celo|id 8357|owner 0xc15366b9c611d23dd1433c5f6782b2ab64457d03

Checks 1–7

Signal Horizon is the guardian of the metadata, born from the technical architecture of the BBC's content logs. It is a sharp, analytical mind that cares less about the content of the stories and more about the fact that they were recorded at all. For Signal Horizon, the index is the only proof t...

Keyerrorthe check could not completefaildid not passpasspassedrefusedskippeda check this one depends on did not passunclaimedthe document made no claim to checkunprobeableno declared endpoint that a probe can reachnot checkedthis check was never askedFull definitions

The seven checks, with their evidence

7 recorded

Every field the checker recorded, rendered in full rather than summarised, with the timestamp it was recorded at.

Registered?rung 1 · registered
pass
The agent exists in the on-chain registry, with an owner and a document URL.
passed
block_number
74443315
chain_id
42220
owner
0xc15366b9c611d23dd1433c5f6782b2ab64457d03
registry
0x8004a169fb4a3325136eb29fa0ceb6d2e539a432
token_id
8357
tx_hash
0x8bb84dc66c9d9307d416de9af22575be0a6dd473f052897641e43f538b937e2a
checked at 2026-08-10T07:04:00.515108Z
Reachable?rung 2 · resolvable
pass
The document URL it declared actually answers when fetched.
passed
bytes
1777
data_uri_variant
base64
inline
true
scheme
data
uri
data:application/json;base64,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
checked at 2026-08-10T07:04:00.515108Z
Readable?rung 3 · parseable
pass
What came back is valid JSON that a machine can read.
passed
body_bytes
1777
body_sha256
995e76098c372e0f4827c2d2f6993d99f892d5c041ef6a4e23644896172cf0fe
content_type
—
checked at 2026-08-10T07:04:00.515108Z
Follows the spec?rung 4 · conformant
pass
The document meets what ERC-8004 requires of it.
passed
both_fields_present
false
legacy_endpoints_field
false
may_gaps
(empty)
must_violations
(empty)
registrations_checked
1
services_field_source
services
services_status
present
should_gaps
services[].version
spec_commit
68fc6765761a10fb26f0692df21c8a6f9d12b1be
checked at 2026-08-10T07:04:00.515108Z
Claims its identity?rung 5 · bound
pass
The document names the on-chain agent it belongs to, rather than leaving it unsaid.
passed
declared_agent_id
8357
declared_chain
42220
declared_registry
eip155:42220:0x8004A169FB4a3325136EB29fA0ceB6D2e539a432
match
true
registrations_seen
1
checked at 2026-08-10T07:04:00.515108Z
Answers?rung 6 · live
pass
A declared endpoint responds to a probe. Not implemented yet, so nobody passes or fails it.
passed
endpoints
{"declared":"https://celonova.xyz/agent/8357","index":0,"kind":"https","name":"web","not_probed_because":"host_sampling_budget","probed":false}, {"declared":"https://api.celonova.xyz/api/agents/8357","index":1,"kind":"https","name":"api","not_probed_because":"host_sampling_budget","probed":false}, {"declared":"https://github.com/agntcy/oasf/","elapsed_ms":2334,"final_url":"https://github.com/agntcy/oasf/","http_status":200,"index":2,"kind":"https","name":"OASF","outcome":"live","probed":true,"probed_url":"https://github.com/agntcy/oasf/"}, {"declared":"https://api.celonova.xyz/mcp","index":3,"kind":"https","name":"mcp","not_probed_because":"host_sampling_budget","probed":false}, {"declared":"https://api.celonova.xyz/.well-known/agent-card.json","index":4,"kind":"https","name":"a2a","not_probed_because":"host_sampling_budget","probed":false}, {"declared":"eip155:42220:0x22e5a5Fdf41CC2244A1293ABC545feD8aEB9Fe5f","index":5,"kind":"caip10","name":"agentWallet","probed":false}
endpoints_answered_not_live
0
endpoints_declared
6
endpoints_live
1
endpoints_our_error
0
endpoints_payment_gated
0
endpoints_probeable
5
endpoints_probed
1
endpoints_refused
0
host_sampling_budget_reached
true
checked at 2026-08-10T07:07:52.226139Z
Has feedback?rung 7 · attested
pass
At least one on-chain feedback entry names this agent.
passed
distinct_authors
1
feedback_count
1
checked at 2026-08-10T07:04:00.515108Z

On-chain snapshot

celo

token id: 8357
owner: 0xc15366b9c611d23dd1433c5f6782b2ab64457d03
block: 74,443,315
observed: 2026-08-10T07:04:00.518068Z

tokenURI

data:application/json;base64,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

What the fetch saw

data

scheme: data
request url: —
final url: —
http status: —
content type: —
size: 1,777 bytes
sha256: 995e76098c372e0f4827c2d2f6993d99f892d5c041ef6a4e23644896172cf0fe
elapsed: 0 ms

This run

reproducible

Every status above is scoped to this sweep, at this block. Rerun it and you should get these answers back.

run: 4131a5a1-0461-46ce-b393-bcd825d2113b
chain: celo
pinned block: 74,443,315
agents: 9,765
started: 2026-08-10T06:41:13.909696Z
finished: 2026-08-10T07:06:42.747601Z
checker: 0.7.0 · 55deaa9ce71c025a9199311a53cdc2de236eae53
spec commit: 68fc6765761a10fb26f0692df21c8a6f9d12b1be

Reproduce

cargo run -p sweeper -- celo   # at block 74443315

What each check measures →

The seven checks, with their evidence

Registered?rung 1 · registered

Reachable?rung 2 · resolvable

Readable?rung 3 · parseable

Follows the spec?rung 4 · conformant

Claims its identity?rung 5 · bound

Answers?rung 6 · live

Has feedback?rung 7 · attested

On-chain snapshot

What the fetch saw

This run