Evidence row 1051886

What was observed

{
  "count": 5,
  "tools": [
    {
      "description": "Decode every Delta Signal layer from a WAV, MP3 or M4A (AAC) file at an https URL: heartbeat cipher, spectral glyph, prime count, watermark (needs the seed used to render), ggwave, modem text and SSTV pictures (returned as PNG).",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "layers": {
            "items": {
              "enum": [
                "heartbeat",
                "primes",
                "glyph",
                "watermark",
                "ggwave",
                "sstv",
                "modem"
              ],
              "type": "string"
            },
            "type": "array"
          },
          "seed": {
            "maxLength": 64,
            "type": "string"
          },
          "url": {
            "description": "https URL of a WAV, MP3 or M4A (AAC) file (convert other formats first)",
            "format": "uri",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "name": "decode_audio"
    },
    {
      "description": "Free. Describe Delta Signal: layers, stings, defaults, limits and prices.",
      "inputSchema": {
        "properties": {},
        "type": "object"
      },
      "name": "describe_engine"
    },
    {
      "description": "Free. Render the SSTV signature card image for a message (PNG) so you can see what the picture sting will carry.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "text": {
            "description": "Up to 38 characters",
            "maxLength": 38,
            "type": "string"
          }
        },
        "required": [
          "text"
        ],
        "type": "object"
      },
      "name": "preview_card"
    },
    {
      "description": "Render a Delta Signal audio signature (WAV, 48 kHz) that hides your message: in the heartbeat rhythm, as text in the spectrogram, as an inaudible watermark, and optionally as an SSTV picture, a ggwave data chirp or modem tones. Returns a download link (kept 7 days) and a manifest. Survives YouTube-grade AAC/Opus.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "duration": {
            "description": "Seconds of signature body (default 60)",
            "maximum": 600,
            "minimum": 3,
            "type": "number"
          },
          "layers": {
            "additionalProperties": {},
            "description": "Per-layer options: bed, heartbeat, primes, glyph {band: mid|hi}, watermark {payload}",
            "propertyNames": {
              "type": "string"
            },
            "type": "object"
          },
          "message": {
            "description": "Printable ASCII, up to 32 characters",
            "maxLength": 32,
            "type": "string"
          },
          "seed": {
            "description": "Watermark key; keep it to verify later",
            "maxLength": 64,
            "type": "string"
          },
          "stings": {
            "items": {
              "additionalProperties": {},
              "properties": {
                "at": {
                  "anyOf": [
                    {
                      "enum": [
                        "start",
                        "end"
                      ],
                      "type": "string"
                    },
                    {
                      "minimum": 0,
                      "type": "number"
                    }
                  ]
                },
                "mode": {
                  "description": "sstv: robot36|robot72|martin1; modem: 1200|300|rtty",
                  "type": "string"
                },
                "protocol": {
                  "description": "ggwave: audible-normal|audible-fast|audible-fastest|ultrasound-*|dt-*",
                  "type": "string"
                },
                "text": {
                  "maxLength": 140,
                  "type": "string"
                },
                "type": {
                  "enum": [
                    "sstv",
                    "ggwave",
                    "modem"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            },
            "maxItems": 8,
            "type": "array"
          }
        },
        "required": [
          "message"
        ],
        "type": "object"
      },
      "name": "render_signature"
    },
    {
      "description": "Verify a Delta Signal audio signature at an https WAV URL: returns which hidden layers are present (found_layers) and whether the audio matches an expected message (matches: true/false, or null if no expected_message given). Cheaper than full decode — use it when you only need to confirm presence or identity.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "expected_message": {
            "description": "Message you expect to find; omit to discover what is present",
            "maxLength": 32,
            "type": "string"
          },
          "seed": {
            "description": "Watermark key used when the signature was rendered",
            "maxLength": 64,
            "type": "string"
          },
          "url": {
            "description": "https URL of a WAV file",
            "format": "uri",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "name": "verify_signature"
    }
  ]
}

What the leaf hashes

{"body":"2f586bf2e366da651c52cf92382388fbd9deb391fac8df802e8d5cf12ddef230","id":1051886,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793302663080493,"prev":1006281,"subject":"a78e26dd-cb19-43ce-abf7-652e747698db","subject_kind":"endpoint"}

Proof

Its day has not closed yet. A day closes ten minutes after midnight UTC; the proof appears here then.