> ## Documentation Index
> Fetch the complete documentation index at: https://docs.truthlocks.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Truth Explorer
> Browse checkpoints, search the transparency log, validate proof bundles, and view issuer profiles.
The [Truth Explorer](https://transparency.truthlocks.com) is a public portal for inspecting the Truthlocks transparency log. Anyone can browse checkpoints, search by attestation ID or leaf hash, validate proof bundles offline, and view the issuer directory — no account required.
Use it to independently verify that an attestation exists in the append-only Merkle tree, confirm checkpoint integrity, or audit issuer trust status.
## Checkpoint timeline
The home page shows a live timeline of every checkpoint recorded in the transparency log. Each row displays:
| Column | Description |
| :--------- | :---------------------------------------------------------------------- |
| Checkpoint | The tree size at the time of the checkpoint, linking to its detail page |
| Age | How long ago the checkpoint was signed |
| Root hash | The Merkle root hash (truncated, with copy-to-clipboard) |
| Signer | The key ID of the signer |
| Status | Whether the checkpoint carries a valid signature |
Four summary cards at the top show the current **tree size**, log **status**, total **checkpoints**, and the age of the **latest** checkpoint.
## Searching the log
Type an attestation ID or leaf hash into the search bar at the top of the timeline. The search auto-detects the query type:
* **Attestation ID** — any non-hex string that identifies a specific attestation.
* **Leaf hash** — a hex string (16+ characters) identifying a leaf in the Merkle tree.
When a match is found, you see the attestation ID, leaf index, event type, and a link to the corresponding checkpoint.
## Checkpoint details
Click any checkpoint number to open a detail view. The page shows:
* **Tree size** — number of leaves at this checkpoint.
* **Timestamp** — when the checkpoint was recorded.
* **Merkle root hash** — the full hex root hash with a copy button.
* **Signature** — the Ed25519 signature (if signed).
* **Signer key ID** — the key that signed the checkpoint.
* **Log ID** — the unique identifier for this log instance.
Checkpoint details confirm log integrity without revealing individual attestation contents. The transparency log is an append-only structure — once a leaf is anchored, it cannot be modified or removed.
## Validating proof bundles
The `/validate` page lets you verify a proof bundle entirely in your browser. No data is sent to any server.
Drag and drop (or click to select) a `proof-bundle.json` file. The maximum file size is 5 MB.
The validator runs four checks automatically:
1. **JSON schema and content integrity** — parses the bundle, verifies the `bundle_hash_b64url` integrity hash, and cross-checks attestation and log metadata.
2. **SHA-256 Merkle inclusion proof** — recomputes the Merkle root from the leaf hash and audit path using the RFC 6962 algorithm, then compares it to the root hash in the checkpoint.
3. **Ed25519 checkpoint signature** — verifies the checkpoint signature against the signing public key using the Web Crypto API.
4. **Network confirmation** — fetches the live checkpoint from the transparency log API and compares root hashes.
A pass/fail banner appears at the top, followed by a step-by-step checklist and summary cards showing the attestation ID, leaf index, and tree size.
Steps 1–3 run entirely offline using browser-native cryptography. Step 4 contacts the transparency log API to confirm the checkpoint is still live. If you are offline, the first three checks still provide strong integrity guarantees.
## Issuer directory
The `/issuers` page lists every issuer in the Truthlocks trust registry that has opted in to the public directory. You can filter by name or issuer ID. Each entry shows:
* **Name and logo** — with a **Verified** badge for issuers that have completed governance review.
* **Website** — a link to the issuer's public site.
* **Verification tier** — **Basic** (default for new issuers) or **Verified** (assigned after governance review). See [transparency settings](/guides/transparency-settings#verification-tiers) for details.
Click an issuer to view their full profile, including their issuer ID, verification tier, status, and when they were registered. To upgrade from Basic to Verified, submit an [issuer application](/guides/issuer-applications). Issuers with a private profile show a note that their signatures are valid but identity details are not public.
## When to use Truth Explorer
| Scenario | What to do |
| :------------------------------------------------- | :----------------------------------------------------------------- |
| Verify a proof bundle someone shared with you | Go to `/validate` and upload the `proof-bundle.json` file |
| Check whether a specific attestation is in the log | Search by attestation ID on the home page |
| Audit the log's checkpoint history | Browse the checkpoint timeline or click into a specific checkpoint |
| Look up an issuer's trust status | Open the `/issuers` directory and search by name or ID |
## Related
Schema and field reference for `proof-bundle.json`.
How to protect content and generate proof bundles.