The ECDSA public key for this cert is calculated from the ECDSA private key initialized by bootrom. Boot ROM decrypts [[OTP Registers]] and writes the private key and Nintendo's signature of this certificate to [[Memory_layout#ARM9_ITCM|ARM9 ITCM]]; the public key is computed from the private key.
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Boot ROM decrypts [[OTP Registers]] and writes the private key and Nintendo's signature of CTCert to [[Memory_layout#ARM9_ITCM|ARM9 ITCM]]; the public key is computed from the private key.