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  ],
  "signed_tree_head": {
    "payload": {
      "issued_at": "2026-09-25T00:00:00Z",
      "log_id": "proofhouse-demo-2026-09-25",
      "root": "04318fd73aaa6c99cd39854982ac9184a3cee2cacadd64fadbb74984704a23e3",
      "tree_size": 12
    },
    "algorithm": "ed25519",
    "key_id": "demo-tree-head-2026-09-25",
    "key_label": "DEMO KEY",
    "signature": "7ab3a4fd1a1fc57d62e6e0b2e3fee73f87f78f30de899d95d13f3b48b4b4d9981025dc73a1614b9831c8c39e71c892526e584a41b0383ceae277c5d6dbd3c802",
    "note": "DEMO KEY. This staging ledger is signed with a pinned Ed25519 demo key. The signing key stays off the site. Fingerprint is published in the page footer, /.well-known/proofhouse-keys.json, and proofhouse/site/README.md."
  },
  "demo": true
}