trezor-firmware/protobuf/bitkey.proto

enum Algorithm {
    BIP32 = 0;
    ELECTRUM = 1;
}
 
enum ScriptType {
    PAYTOADDRESS = 0;
    PAYTOSCRIPTHASH = 1;
} 

// Response: None or Features
message Initialize {
}

message Features {
    optional string version = 1;
    optional bool otp = 2;
    optional bool pin = 3;
    optional bool spv = 4;
    optional uint64 maxfee_kb = 5;
    repeated Algorithm algo = 6;
}

// Description: Test if another side is still alive.
// Response: None or Success
message Ping {
    optional string message = 1;
}

// Description: Response message for previous request with given id.
message Success {
    optional string message = 1;
}

// Description: Response message for previous request with given id.
message Failure {
    optional int32 code = 1;
    optional string message = 2;
}

// Response: UUID or Failure
message GetUUID {
}

message UUID {
    required bytes UUID = 1;
}

message OtpRequest {
   optional string message = 1;
}

message OtpAck {
    required string otp = 1;
}

message OtpCancel {
}

message PinRequest {
   optional string message = 1;
}

message PinAck {
    required string pin = 1;
}

message PinCancel {
}

// Response: OtpRequest, Entropy, Failure
message GetEntropy {
    required uint32 size = 1;
}

message Entropy {
    required bytes entropy = 1;
}

// Response: Success, OtpRequest, PinRequest, Failure
message SetMaxFeeKb {
	required uint64 maxfee_kb= 1;
}

// Response: MasterPublicKey, Failure
message GetMasterPublicKey {
    required Algorithm algo = 1 [default=BIP32];
}

message MasterPublicKey {
    required bytes key = 1;
}

// Response: Success, OtpRequest, Failure
message LoadDevice {
    required string seed = 1;
    optional bool otp = 2 [default=true];
    optional string pin = 3;
    optional bool spv = 4 [default=true];
}

// Response: Success, OtpRequest, PinRequest, Failure
message ResetDevice {
}

message TxOutput {
    required string address = 1;
    repeated uint32 address_n = 2;
    required uint64 amount = 3;
    required ScriptType script_type = 4;
    repeated bytes script_args = 5;
}

// Response: Success, SignedInput, Failure
message TxInput {
    repeated uint32 address_n = 1;
    required uint64 amount = 2;
    required bytes prev_hash = 3;
    required uint32 prev_index = 4;
    optional bytes script_sig = 5;
}

// Response: SignedTx, Success, OtpRequest, PinRequest, Failure
message SignTx {
    required Algorithm algo = 1 [default=BIP32];
    optional bool stream = 2; // enable streaming
    required uint64 fee = 3;
    repeated TxOutput outputs = 4;
    repeated TxInput inputs = 5;
    optional uint32 inputs_count = 6; // for streaming
    optional bytes random = 7;
}

message SignedTx {
   repeated bytes signature = 1;
}

/*
inputs = [] # list of TxInput
for i in inputs:
    for x in inputs:
        send(x)
        
	signature = send(SignInput(i))
*/

// Response: SignedInput, Failure
message SignInput {
	required TxInput input = 1;
}

message SignedInput {
	required bytes signature = 1;
}