{
  "set": "c2sp-cosignature",
  "retrieved": "2026-10-22",
  "note": "Ed25519 cosignature/v1 vector from sigsum-go (independent implementation). 0x06 (ML-DSA-44): no independent vector found as of 2026-10-22; torchwood and transparency-dev/formats only round-trip freshly generated keys, and the C2SP spec text carries no signed example.",
  "sources": [
    {
      "repo": "https://github.com/sigsum/sigsum-go",
      "commit": "ada02e666e763ca9b947e9203bbe28afacbe782c",
      "licence": "BSD-2-Clause",
      "licence_file": "LICENSE",
      "files": [
        {
          "path": "sigsum-go/LICENSE",
          "upstream_path": "LICENSE",
          "bytes": 1336,
          "sha256": "6a1e3378dcd18baade08ac30ec4ba33b72d1b1697c00226ef85b9c9cefdb4e65"
        },
        {
          "path": "sigsum-go/pkg/checkpoint/checkpoint_test.go",
          "upstream_path": "pkg/checkpoint/checkpoint_test.go",
          "bytes": 8480,
          "sha256": "ce9cb21bc8a2699c62f23d1395f46bf2536247af0761bfec7add00559b7ab19a"
        }
      ]
    },
    {
      "repo": "https://github.com/C2SP/C2SP",
      "commit": "fea9004f73fbec8cf7a8b1936430e2487eb23b55",
      "licence": "BSD-1-Clause",
      "licence_file": ".github/LICENSE-BSD-1-CLAUSE",
      "files": [
        {
          "path": "C2SP/.github/LICENSE-BSD-1-CLAUSE",
          "upstream_path": ".github/LICENSE-BSD-1-CLAUSE",
          "bytes": 1052,
          "sha256": "ccea66763c12f526fb366431906603820e94e705779a99e5fdf8182f9e9807f9"
        },
        {
          "path": "C2SP/tlog-cosignature.md",
          "upstream_path": "tlog-cosignature.md",
          "bytes": 10715,
          "sha256": "9cf3f0ef2690319697fcbb4d1e823b593d90a1769912fdcb859ab89a3f924fbe"
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}