Cargo Features

[dependencies]
hdkey = { version = "0.0.5", default-features = false, features = ["std", "global-context"] }
default = std

The std feature is set by default whenever hdkey is added without default-features = false somewhere in the dependency tree.

std default global-context? = secp256k1
global-context = std

Enables global-context of secp256k1 ^0.28

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

secp256k1 global-context? std

Enables secp256k1 ^0.28