Trezor cannot send to bech32 addresses

[lzsaver]

File -> New/Restore -> Standard wallet -> Create a new seed -> Segwit

I'm getting bc1-addresses, is it okay? I thought I should get 3-addresses.

[SomberNight]

Yes, that is expected. Electrum "segwit" seeds have native segwit outputs with BIP173 ("bech32") addresses.

electrum/RELEASE-NOTES

Lines 12 to 24 in 91ed74a

	- Native segwit scripts are supported with Electrum software
	wallets, using a new type of seed. Segwit seeds have version
	0x100. Note that the wizard will not create Segwit seeds by
	default; users must opt-in with the segwit option.
	- Native segwit scripts are represented using bech32 addresses,
	following BIP173. Please note that BIP173 is still in draft
	status, and that other wallets/websites may not support
	it. Thus, you should keep a non-segwit wallet in order to be
	able to receive bitcoins during the transition period. If BIP173
	ends up being rejected or substantially modified, bech32 wallets
	may have to be restored from seed. This will not affect funds
	sent to bech32 addresses, and it will not affect the capacity of
	Electrum to spend these funds.

[lzsaver]

Oh, I did not read BIP173. It seems that it has not been accepted yet. Thanks.

[lzsaver]

Traceback (most recent call last):
  File "/home/user/electrum-good/lib/python3.5/site-packages/electrum_gui/qt/util.py", line 589, in run
    result = task.task()
  File "/home/user/electrum-good/lib/python3.5/site-packages/electrum/wallet.py", line 1138, in sign_transaction
    k.sign_transaction(tx, password)
  File "/home/user/electrum-good/lib/python3.5/site-packages/electrum_plugins/trezor/plugin.py", line 70, in sign_transaction
    self.plugin.sign_transaction(self, tx, prev_tx, xpub_path)
  File "/home/user/electrum-good/lib/python3.5/site-packages/electrum_plugins/trezor/plugin.py", line 248, in sign_transaction
    outputs = self.tx_outputs(keystore.get_derivation(), tx, keystore.is_segwit())
  File "/home/user/electrum-good/lib/python3.5/site-packages/electrum_plugins/trezor/plugin.py", line 368, in tx_outputs
    addrtype, hash_160 = b58_address_to_hash160(address)
  File "/home/user/electrum-good/lib/python3.5/site-packages/electrum/bitcoin.py", line 315, in b58_address_to_hash160
    return _bytes[0], _bytes[1:21]
TypeError: 'NoneType' object is not subscriptable

I can't send coins to the bc1-address. Tested on 088b1e6 and 91ed74a + your patch.
It seems to be trezor-specific (not implemented in Trezor?).

By the way, is it good idea to use BIP173 by default while it is just a draft?

[SomberNight]

It's likely not implemented in Trezor (or at least the Trezor plugin). I think this warrants a separate issue.

[lzsaver]

I'll check it with your b1167e9 patch.

[lzsaver]

It does not work with the b1167e9 patch, and it does not work on dd006b5. It seems to be trezor-related.

[lzsaver]

By the way, is it good idea to use BIP173 by default while it is just a draft?

It seems they are going to accept it, bech32 support was added to Bitcoin Core.

[ecdsa]

I added this blind fix: 0df24d9
it still fails for me, but it might work on recent firmware

[ecdsa]

still failing after firmware update

[ecdsa]

trezor/trezor-common#15 (comment)

[jhoenicke]

FYI, I finished my implementation of bech32 in TREZOR firmware trezor/trezor-mcu#236.
Electrum doesn't need any changes to send to bech32 addresses with the TREZOR with the new firmware: https://www.blocktrail.com/tBTC/tx/f7236e1da665db69bfb931ed2d0e7cd3c46f2d36fc6cc5c7199ca317c04c45d1

It would need some changes to use a wallet with bech32 addresses with Trezor, but I think we don't want to go that way soon.

Now I need a blockexplorer that shows the address.

[lzsaver]

Now I need a blockexplorer that shows the address.

Blockchain.info shows bc-addresses if you click 'Show scripts & coinbase'.

[lzsaver]

Thank you. It works (tested on Trezor 1.6).