Cargo Features

[dependencies]
bp-messages = { version = "0.18.0", default-features = false, features = ["std"] }
default = std

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

std default

Enables std of bp-header-chain, bp-runtime, parity-scale-codec, frame-support, scale-info, serde, sp-core, sp-io, and sp-std

serde:

Provide impls for common standard library types like Vec<T> and HashMap<K, V>.
Requires a dependency on the Rust standard library.

bp-messages has 2 features without comments.