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Question about hardware-sdk passphrase flow

I noticed in the passphrase docs that entering the passphrase through keyboard requires the user-facing wallet to request the passphrase from the user https://github.com/OneKeyHQ/docs/blob/main/connect-to-hardware/hardware-sdk/passphrase.md#enter-the-passphrase-in-the-software. This seems incorrect to me, as the purpose of the hardware wallet is to ensure that the user-facing wallet does not know anything about the PIN or passphrase. Shouldn't this be handled by the bridge software instead? This is what Trezor does, for example.

low level method to sign with ecdsa

Hi team,

I've read the doc about how to sign a BTC transaction https://developer.onekey.so/connect-to-hardware/hardware-sdk/api-reference/bitcoin/btcsigntransaction. It requires passing a struct to describe the transaction

HardwareSDK.btcSignTransaction(connectId, deviceId, {
    inputs: [
        {
            address_n: [(44 | 0x80000000) >>> 0, (0 | 0x80000000) >>> 0, (2 | 0x80000000) >>> 0, 1, 0],
            prev_index: 0,
            prev_hash: 'b035d89d4543ce5713c553d69431698116a822c57c03ddacf3f04b763d1999ac',
        }
    ],
    outputs: [
        {
            address_n: [(44 | 0x80000000) >>> 0, (0 | 0x80000000) >>> 0, (2 | 0x80000000) >>> 0, 1, 1],
            amount: '3181747',
            script_type: 'PAYTOADDRESS',
        }, {
            address: '18WL2iZKmpDYWk1oFavJapdLALxwSjcSk2',
            amount: '200000',
            script_type: 'PAYTOADDRESS',
        }
    ],
    coin: 'btc'
});

I'm wondering if there's a way to call a method to sign with ECDSA, directly passing the sighashPreimage instead of a struct tx, so that we can call like

HardwareSDK.signEcdsa(connectId, deviceId, {
    path: "m/44'/0'/0'",
    sighashPreimage: "xxxxxxxxxx"
});

this method would return the result of the DER signature 3045xxxxxxx, or the raw ECDSA signature (r, s).

Thank you.

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