Cargo Features

[dependencies]
libecvrf-k256 = { version = "1.1.4", default-features = false, features = ["std", "no_std"] }
default = no_std

The no_std feature is set by default whenever libecvrf-k256 is added without default-features = false somewhere in the dependency tree.

std
no_std default

libecvrf-k256 has 3 features without comments.