ECDSA certificate not NIST/HIPAA compliant, SERVER CERTIFICATES ARE SIGNED WITH A WRONG ALGORITHM (sha256WithRSAEncryption instead ecdsa-with-SHA256).
https://www.immuniweb.com/ssl/?id=cRcQCUmb
Why you sha256WithRSAEncryption instead ecdsa-with-SHA256?
Let’s Encrypt only provide leaf ECDSA certificates, signed by RSA intermediates. (or leaf RSA certificates, signed by RSA intermediates)
It will provide in the future, ECDSA certificates, signed by ECDSA intermediates: https://letsencrypt.org/upcoming-features/
Thank you for the quick response! 
I will wait for this support!
Tell me, please, do you support the signature of ECDSA certificates created using the X25519 curve?
No, Let's Encrypt doesn't support EdDSA. Mostly, I think, because it isn't allowed by the CA/B Forum.
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