The Subsidiary Body for Scientific and Technological Advice (SBSTA), at its nineteenth session, requested the secretariat, subject to the availability of resources, to consider possible ways of facilitating ongoing cooperation among administrators of registries and the transaction log and to provide a progress report on its work on registry systems to the SBSTA at its twentieth session. These registry systems are to facilitate the mechanisms under Articles 6, 12 and 17 and the accounting of assigned amounts under Article 7, paragraph 4, of the Kyoto Protocol. This note outlines possible forms of cooperation among administrators of registries and the transaction log. It also describes progress in elaborating the specifications of the data exchange standards and in developing and implementing the transaction log, including measures taken to reduce the resources required to develop the transaction log. The SBSTA may wish to consider the information in this note and prepare a draft decision for consideration by the Conference of the Parties, at its tenth session, in relation to the specifications of the data exchange standards and the establishment of measures to facilitate cooperation among administrators of registries and the transaction log.