Recomputes every record hash from a canonical JSON representation of id, sequenc
Recomputes every record hash from a canonical JSON representation of id, sequence, timestamp, previous_hash and payload, then checks that each record points to the hash of the record before it. If a root_hash is supplied, the same computed record hashes are folded into a deterministic binary Merkle tree with the last leaf duplicated on odd levels.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
1165 msmedian answer time
$0.005listed price per call
$0.005price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://sicher.halowerk.com/v1/log-chain-verify
| Category | Everything else |
|---|---|
| Provider host | sicher.halowerk.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 1165 ms |
Example input (from the provider)
{
"body": {
"records": [
{
"hash": "7f07223905bb01a5b3f2eda8a61c69280b6e75c938712afcb187bbf2a0d696c4",
"id": "evt-001",
"payload": {
"action": "created",
"actor": "build-bot",
"subject": "release-2026.08.19"
},
"previous_hash": null,
"sequence": 1,
"timestamp": "2026-08-19T09:00:00Z"
},
{
"hash": "4584b3d398d3dd075f43d61a2c44991c61d3183c22243582c367cdccb1af664c",
"id": "evt-002",
"payload": {
"action": "approved",
"actor": "release-manager",
"subject": "release-2026.08.19"
},
"previous_hash": "7f07223905bb01a5b3f2eda8a61c69280b6e75c938712afcb187bbf2a0d696c4",
"sequence": 2,
"timestamp": "2026-08-19T09:01:00Z"
}
],
"root_hash": "f6e5b0a2eeed0102fcdd3480a6f7a851bb55679f2d3c7e532df3780f46c1b426"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"records": {
"description": "Audit records in chain order.",
"items": {
"additionalProperties": false,
"properties": {
"hash": {
"description": "Claimed SHA-256 hash of this record.",
"maxLength": 71,
"minLength": 64,
"type": "string"
},
"id": {
"description": "Stable event id.",
"maxLength": 160,
"minLength": 1,
"type": "string"
},
"payload": {
"description": "Event payload to include in the record hash."
},
"previous_hash": {
"anyOf": [
{
"maxLength": 71,
"minLength": 64,
"type": "string"
},
{
"type": "null"
}
],
"description": "Hash of the previous record, or null for the first record."
},
"sequence": {
"description": "Monotonic event position.",
"maximum": 1000000000,
"minimum": 0,
"type": "integer"
},
"timestamp": {
"description": "Event time as supplied by the log producer.",
"maxLength": 80,
"minLength": 1,
"type": "string"
}
},
"required": [
"id",
"sequence",
"timestamp",
"previous_hash",
"payload",
"hash"
],
"type": "object"
},
"maxItems": 500,
"minItems": 1,
"type": "array"
},
"require_monotonic_sequence": {
"default": true,
"description": "Require sequence numbers to increase by one.",
"type": "boolean"
},
"root_hash": {
"description": "Optional claimed Merkle root over the computed record hashes.",
"maxLength": 71,
"minLength": 64,
"type": "string"
}
},
"required": [
"records"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}