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trezor-firmware/protob/common.proto

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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;
}