For example: I need details of tls-sni authorization.
I have checked https://ietf-wg-acme.github.io/acme/ and find description of tls-sni-02. But it isn’t supported by server yet.
I have checked https://tools.ietf.org/html/draft-ietf-acme-acme-02 it describe tls-sni-02 too only.
draft-ietf-acme-acme-01 - describe tls-sni-01. But implementation in official client and other libraries different from description: they create first certificate only instead of number of certificates for each of many hash iterations.