"URI Extension Block"
-This block is a bencoded dictionary. All buckets hold an identical copy. The
-hash of the serialized data is kept in the URI.
+This block is a serialized dictionary with string keys and string values
+(some of which represent numbers, some of which are SHA-256 hashes). All
+buckets hold an identical copy. The hash of the serialized data is kept in
+the URI.
The download process must obtain a valid copy of this data before any
decoding can take place. The download process must also obtain other data