The private key (D) is 4.
No joke.
Verification:
openssl pkey -in key.pem -pubout -outform DER | openssl dgst -sha256
openssl x509 -in cert.pem -pubkey -noout | openssl pkey -pubin -outform DER | openssl dgst -sha256

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The private key (D) is 4.
No joke.
Verification:
openssl pkey -in key.pem -pubout -outform DER | openssl dgst -sha256
openssl x509 -in cert.pem -pubkey -noout | openssl pkey -pubin -outform DER | openssl dgst -sha256
-----BEGIN EC PRIVATE KEY-----
MIGkAgEBBDAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAASgBwYFK4EEACKhZANiAAQTglHNUqySmMHIqtl3Mh3rl+cJvQtMoKyl
XcitUdz8nRWJoVl+OlEg4e/WMcY+GDXKyuKYaaYuFjHoooGBq1ZhbcRdkYq8CfOr
DmPPeSqk3O1zh743u6VpVJ8cArJw7Wc=
-----END EC PRIVATE KEY-----