This message is intended only for participants using automated communication with CS OTE.

On 12 May 2026 at 15:00, the CS OTE authentication certificate will be replaced.

The certificate is used primarily for the following purposes:

• securing SOAP web services using a BinarySecurityToken within WS-Security,
• verifying signatures of responses sent by CS OTE,
• TLS authentication of communication in the OTE → participant direction.

The certificate is CN = CS OTE auth, and the certification authority remains unchanged.

To maintain functional automated communication with CS OTE, it is necessary to verify that the new certificate will be trusted and correctly processed in your systems.

The new certificate is available for download HERE .