diff --git a/types/meta.go b/types/meta.go
new file mode 100644
index 0000000..767a485
--- /dev/null
+++ b/types/meta.go
@@ -0,0 +1,59 @@
+package types
+
+type MetadataExtension int
+
+const (
+	MetadataExtensionLicenses           MetadataExtension = 0x0B
+	MetadataExtensionDonationKeys       MetadataExtension = 0x0C
+	MetadataExtensionWikidataClaims     MetadataExtension = 0x0D
+	MetadataExtensionLanguages          MetadataExtension = 0x0E
+	MetadataExtensionSourceUris         MetadataExtension = 0x0F
+	MetadataExtensionUpdateCID          MetadataExtension = 0x10
+	MetadataExtensionPreviousVersions   MetadataExtension = 0x11
+	MetadataExtensionTimestamp          MetadataExtension = 0x12
+	MetadataExtensionTags               MetadataExtension = 0x13
+	MetadataExtensionCategories         MetadataExtension = 0x14
+	MetadataExtensionViewTypes          MetadataExtension = 0x15
+	MetadataExtensionBasicMediaMetadata MetadataExtension = 0x16
+	MetadataExtensionBridge             MetadataExtension = 0x17
+	MetadataExtensionOriginalTimestamp  MetadataExtension = 0x18
+	MetadataExtensionRoutingHints       MetadataExtension = 0x19
+)
+
+var MetadataMap = map[MetadataExtension]string{
+	MetadataExtensionLicenses:           "MetadataExtensionLicenses",
+	MetadataExtensionDonationKeys:       "MetadataExtensionDonationKeys",
+	MetadataExtensionWikidataClaims:     "MetadataExtensionWikidataClaims",
+	MetadataExtensionLanguages:          "MetadataExtensionLanguages",
+	MetadataExtensionSourceUris:         "MetadataExtensionSourceUris",
+	MetadataExtensionUpdateCID:          "MetadataExtensionUpdateCID",
+	MetadataExtensionPreviousVersions:   "MetadataExtensionPreviousVersions",
+	MetadataExtensionTimestamp:          "MetadataExtensionTimestamp",
+	MetadataExtensionTags:               "MetadataExtensionTags",
+	MetadataExtensionCategories:         "MetadataExtensionCategories",
+	MetadataExtensionViewTypes:          "MetadataExtensionViewTypes",
+	MetadataExtensionBasicMediaMetadata: "MetadataExtensionBasicMediaMetadata",
+	MetadataExtensionBridge:             "MetadataExtensionBridge",
+	MetadataExtensionOriginalTimestamp:  "MetadataExtensionOriginalTimestamp",
+	MetadataExtensionRoutingHints:       "MetadataExtensionRoutingHints",
+}
+
+const MetadataMagicByte = 0x5f
+
+type MetadataType uint8
+
+const (
+	MetadataTypeMedia        MetadataType = 0x02
+	MetadataTypeWebApp       MetadataType = 0x03
+	MetadataTypeDirectory    MetadataType = 0x04
+	MetadataTypeProof        MetadataType = 0x05
+	MetadataTypeUserIdentity MetadataType = 0x07
+)
+
+var MetadataTypeMap = map[string]MetadataType{
+	"Media":        MetadataTypeMedia,
+	"WebApp":       MetadataTypeWebApp,
+	"Directory":    MetadataTypeDirectory,
+	"Proof":        MetadataTypeProof,
+	"UserIdentity": MetadataTypeUserIdentity,
+}