I am facing ECDSAUtil - Curve not supported: secp256k1 (1.3.132.0.10) error when try to validate the XML invoice.
please do not use the private key that is being generated with the CSR, instead use the private key in the following path:SDK\Data\Certificates/ec-secp256k1-priv-key.pem
It was resolved by downgrading my Java version.