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SPHINCS+ is a post-quantum digital signature algorithm designed to address the potential threats posed by quantum computers. It is renowned for its unique ability to resist quantum attacks by using a hash-based signature structure, ensuring long-term security without relying on traditional number-theoretic assumptions. SPHINCS+ prioritizes security over speed or signature size, making it suitable for applications requiring high stability, long-term guarantees, as well as efficiency. The creation of this standard is the result of years of global efforts to combat the threats posed by quantum computers, SPHINCS+ algorithm was developed by an international team and selected as one of the post-quantum cryptography standards in July 2022. Associate Research Fellow Ruben Niederhagen from the Institute of Information Science, Academia Sinica, Taiwan is one of the team members and contributed to the update and revision of the SPHINCS+ program. Another two main members, Dr. Tanja Lange from the Eindhoven University of Technology, Netherlands and Dr. Daniel J. Bernstein from the University of Illinois Chicago, USA, are visiting professors in the Institute of Information Science, Academia Sinica. The standardization signifies a significant milestone in the field of post-quantum cryptography, as SPHINCS+ has become the standard of NIST on Aug. 2024, which is poised to be a widely adopted global standard.