> ## Documentation Index
> Fetch the complete documentation index at: https://docs.obsidianlog.com/llms.txt
> Use this file to discover all available pages before exploring further.

# obsidianlog verify

> Traverse and validate the full hash chain for tamper-evidence.

This walks each service's SHA-256 hash chain from genesis and confirms
it's intact, proof that nothing archived has been modified, reordered,
or removed since it was written. It never decrypts log content to do
this.

## Flags

| Flag               | Description                                                                      |
| ------------------ | -------------------------------------------------------------------------------- |
| `--service <NAME>` | Restrict verification to a single service's chain. Omit to verify every service. |

Plus the global [`--config <FILE>`](/cli/overview#global-flags).

## Exit codes

`verify` exits **non-zero on any break** in any checked chain, and zero
otherwise, designed to be gated on directly in CI or a cron job:

```sh theme={null}
obsidianlog verify || alert-on-call "hash chain broken"
```

## Example

```sh theme={null}
# Verify everything.
obsidianlog verify

# Verify just one service.
obsidianlog verify --service api
```

For a chain that fails, `verify` prints which service and where the break
was detected (a missing chunk, a corrupted chunk, or a head mismatch),
rather than just a pass/fail.