trezor-firmware/protob/common.proto

syntax = "proto2";

/**
 * Structure representing BIP32 (hierarchical deterministic) node
 * Used for imports of private key into the device and exporting public key out of device
 */
message HDNodeType {
    required uint32 depth = 1;
    required uint32 fingerprint = 2;
    required uint32 child_num = 3;
    required bytes chain_code = 4;
    optional bytes private_key = 5;
    optional bytes public_key = 6;
}