The International Transaction Log (ITL) connects registries and secretariat systems that are involved in the
emissions trading mechanism defined under the Kyoto Protocol and its Doha amendment. One of the key mandates
of the ITL is to ensure an accurate accounting and verification of transactions proposed by registries in
order to support the review and compliance process of the Kyoto Protocol.
In practical terms, registries send transaction proposals to the ITL, which assesses each proposal against a
set of defined checks, derived from the Kyoto Protocol, its Doha amendment and other relevant COP/CMP
decisions. The ITL then responds to registries’ transaction proposals by clearing them for further
processing. If a transaction proposal is approved, the registry completes the transaction; if the transaction
proposal is rejected, the ITL sends an error code indicating which ITL check has failed and the registry
terminates the transaction.
The full specifications of the ITL system are defined in the
Data Exchange Standards (6517 kB) (DES). The DES describes the technical requirements for the
communication between the ITL and registries. It also provides the list of all the checks performed by the
ITL.The UNFCCC secretariat in its capacity of the ITL administrator has awarded a contract for the development,
hosting and technical support of the ITL to leading IT services companies. The technical arrangements for the
ITL include adequate provisions to ensure high-availability of the system and secure communications between the
ITL and registries. A service desk team, operating 7 days a week, is also in place to assist the administrators
and operators of systems connected to the ITL.