A content server precomputes a hash value corresponding to content stored by the server. The server receives a request for the hash value from a first client device and provides the hash value to the first client device. The server receives a request for the content corresponding to the hash value from the first client device and provides the content to the first client device. The server receives a request for the hash value from a second client device and provides the hash value to the second client device, wherein the second client device obtains the content from the first client device or a local cache over a higher bandwidth connection.