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diff --git a/doc/schema/sth.schema.json b/doc/schema/sth.schema.json
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+{
+	"$schema": "https://json-schema.org/draft-07/schema#",
+	"title": "signed_tree_head_v0",
+	"description": "JSON-formatted signed tree head, version 0.",
+
+	"type": "object",
+	"required": [ "timestamp", "tree_size", "root_hash", "signatures" ],
+	"properties": {
+		"timestamp": {
+			"description": "The number of milliseconds since the UNIX epoch (January 1, 1970 00:00:00 UTC).",
+			"type": "integer",
+			"minimum": 0
+		},
+		"tree_size": {
+			"description": "The number of entries that are stored in the log's Merkle tree.",
+			"type": "integer",
+			"minimum": 0
+		},
+		"root_hash": {
+			"description": "The log's Merkle tree root hash in base64.",
+			"type": "string",
+			"minLength": 44,
+			"maxLength": 44
+		},
+		"signatures": {
+			"description": "A list of signer-signature pairs.",
+			"type": "array",
+			"items": {
+				"description": "A signer-signature pair.",
+				"type": "object",
+				"required": [ "key_hash", "signature" ],
+				"properties": {
+					"key_hash": {
+						"description": "A public verification-key hash that identifies the signer in base64.",
+						"type": "string",
+						"minLength": 44,
+						"maxLength": 44
+					},
+					"signature": {
+						"description": "The signer's signature over the log's tree_leaf structure in base64.",
+						"type": "string",
+						"minLength": 44,
+						"maxLength": 44
+					}
+				}
+			},
+			"minItems": 1
+		}
+	}
+}