Cargo Features

[dependencies]
bitcoincore-rpc = { version = "0.19.0", default-features = false, features = ["rand"] }
default = rand

The rand feature is set by default whenever bitcoincore-rpc is added without default-features = false somewhere in the dependency tree.

rand default

Enables rand of bitcoincore-rpc-json

bitcoincore-rpc has 2 features without comments.