{
  "log_key": "sum.golang.org",
  "description": "Go checksum database",
  "operator": "Google, for the Go project",
  "checkpoint_url": "https://sum.golang.org/latest",
  "checkpoint_format": "c2sp_signed_note",
  "signature_scheme": "ed25519_note",
  "key_source_url": "https://raw.githubusercontent.com/golang/go/master/src/cmd/go/internal/modfetch/key.go",
  "limbs": {
    "log_listed_in_a_public_list": {
      "outcome": "ok",
      "listed_in": "named individually in the expectations file"
    },
    "public_key_obtained_independently_of_the_log": {
      "outcome": "ok",
      "key_source": "https://raw.githubusercontent.com/golang/go/master/src/cmd/go/internal/modfetch/key.go"
    },
    "checkpoint_endpoint_answers_without_credentials": {
      "outcome": "ok",
      "status": 200,
      "bytes": 188
    },
    "checkpoint_parses_in_its_declared_format": {
      "outcome": "ok",
      "format": "c2sp_signed_note"
    },
    "checkpoint_carries_tree_size_and_root_hash": {
      "outcome": "ok",
      "tree_size": 58590854,
      "root_hash": "c8b3fff227d09355c3d26b07866b192cd6d110c73a21da7bb45d936b0d704b36"
    },
    "checkpoint_carries_a_signature": {
      "outcome": "ok",
      "signature_lines": 1
    },
    "signature_scheme_supported_by_this_monitor": {
      "outcome": "ok",
      "scheme": "ed25519_note"
    },
    "signature_verifies_against_the_published_key": {
      "outcome": "ok",
      "scheme": "ed25519_note"
    },
    "checkpoint_carries_witness_cosignatures": {
      "outcome": "fail",
      "reason": "checkpoint_carried_no_signature_beyond_the_log_own",
      "attribution": "publisher",
      "note": null
    },
    "prior_batch_checkpoint_on_record": {
      "outcome": "ok",
      "prior_read_at": "2026-08-02T05:34:44.216728+00:00",
      "prior_tree_size": 58590582
    },
    "second_read_answered": {
      "outcome": "ok",
      "tree_size": 58590854
    },
    "tree_did_not_shrink_between_reads": {
      "outcome": "ok",
      "first_size": 58590854,
      "second_size": 58590854,
      "entries_added": 0
    },
    "consistency_proof_served": {
      "outcome": "not_applicable",
      "reason": "tree_did_not_advance_between_the_two_reads",
      "note": "There is nothing to prove between a size and itself. The two reads returned the same root, which is what a consistent log looks like over a quiet window."
    },
    "consistency_proof_recomputes_to_the_second_root": {
      "outcome": "not_applicable",
      "reason": "no_proof_needed_between_equal_sizes"
    }
  },
  "evidence": {
    "first_read": {
      "url": "https://sum.golang.org/latest",
      "status": 200,
      "error": null,
      "bytes": 188,
      "read_at": "2026-08-02T05:42:50.086248+00:00",
      "body_sha256": "f439ef4f4defcbae4e8b0480ed185886eda367a280b1361fa67eebc644314efd",
      "parsed": true,
      "format": "c2sp_signed_note",
      "origin": "go.sum database tree",
      "tree_size": 58590854,
      "signature_lines": 1,
      "extension_lines": [],
      "root_hash_hex": "c8b3fff227d09355c3d26b07866b192cd6d110c73a21da7bb45d936b0d704b36",
      "raw_body": "go.sum database tree\n58590854\nyLP/8ifQk1XD0msHhmsZLNbREMc6Idp7tF2Taw1wSzY=\n\n— sum.golang.org Az3grlBb0TFOcY8iD8eRK/yWWjPOROIkdVEmmxkCAcFbBKLcMOHmIDF6bghC1b2s7CUrohamI5P2PQNNar8yetSgfQU=\n"
    },
    "signature_check": {
      "supported": true,
      "verified": true,
      "scheme": "ed25519_note",
      "by": "sum.golang.org"
    },
    "prior_batch": {
      "log_key": "sum.golang.org",
      "read": "second_read",
      "read_at": "2026-08-02T05:34:44.216728+00:00",
      "tree_size": 58590582,
      "root_hash": "39790584467d52479e1b9ff841f506fde0c32d2923aaa57e918df477a2990584",
      "body_sha256": "0c2f75b79f0f87408a42bd9b8af0fff02816f788af9a458487c5ed2e3fc05f02"
    },
    "second_read": {
      "url": "https://sum.golang.org/latest",
      "status": 200,
      "error": null,
      "bytes": 188,
      "read_at": "2026-08-02T05:43:51.639879+00:00",
      "body_sha256": "f439ef4f4defcbae4e8b0480ed185886eda367a280b1361fa67eebc644314efd",
      "parsed": true,
      "format": "c2sp_signed_note",
      "origin": "go.sum database tree",
      "tree_size": 58590854,
      "signature_lines": 1,
      "extension_lines": [],
      "root_hash_hex": "c8b3fff227d09355c3d26b07866b192cd6d110c73a21da7bb45d936b0d704b36"
    }
  },
  "tree_advanced_between_reads": false,
  "entries_added_between_reads": 0,
  "checked_at": "2026-08-02T05:43:57.759029+00:00",
  "must_admit": true,
  "full_admit": true,
  "refuse_limb": null,
  "refuse_reason": null,
  "attribution": null,
  "must_limbs_failed": [],
  "should_limbs_failed": [],
  "receipt_filename": "sum.golang.org.json",
  "ledger": "https://geniusflow-federation.vercel.app/tlog/ledger.json",
  "ledger_digest": "1e9ae859e742abe6cfb6dabb7e5d337cba88d3f3cc0715ceb8a5a9bdc3821603",
  "expectations_digest": "78cb2f5444df2da26462e17070ab9e421ae85b30a8ec1ed672ea21cddeb34290"
}