Primary Algorithm: The primary algorithm is Elliptic Curve Digital Signature Algorithm
(ECDSA) as defined in (ISO/IEC 14888–3:2006) section 2.3, using the P–256 parameters as defined in appendix D (D.1.2.3) of (FIPS PUB 186–4) in combination the
SHA–256 hash algorithm as defined in (ISO/IEC 10118–3:2004) function 4.
This corresponds to the COSE algorithm parameter ES256.
Secondary Algorithm: The secondary algorithm is RSASSA-PSS as defined in (RFC
8230) with a modulus of 2048 bits in combination with the SHA–256 hash algorithm as
defined in (ISO/IEC 10118–3:2004) function 4.
Primary Algorithm: The primary algorithm is Elliptic Curve Digital Signature Algorithm (ECDSA) as defined in (ISO/IEC 14888–3:2006) section 2.3, using the P–256 parameters as defined in appendix D (D.1.2.3) of (FIPS PUB 186–4) in combination the SHA–256 hash algorithm as defined in (ISO/IEC 10118–3:2004) function 4. This corresponds to the COSE algorithm parameter ES256.
Secondary Algorithm: The secondary algorithm is RSASSA-PSS as defined in (RFC 8230) with a modulus of 2048 bits in combination with the SHA–256 hash algorithm as defined in (ISO/IEC 10118–3:2004) function 4.
So not exactly 512 bit RSA.