Mycelium Bitcoin Wallet

[Rassah]

Did anyone notice that it disappeared from the iOS app store a few days ago?
And, the app itself does sync, but you can't send bitcoins from it.  (issue started when the app disappeared)

Yeah, Apple screwed up our AppStore submission. We had to pull it because the updated version would lock up user's bitcoins and prevent them from spending. We found the problem, though, and should have a fixed one soon.

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[Michail1]

Yeah, Apple screwed up our AppStore submission. We had to pull it because the updated version would lock up user's bitcoins and prevent them from spending. We found the problem, though, and should have a fixed one soon.

Good thing I have it on android and only used the iOS version as a watch. 
Thanks for the response.

[Gisado]

I just read this issue on github and I'm considering moving to other wallet... It's a big no-no if it depends on proprietary services. _{Though I know sometimes there is no alternatives, but thats not the case here.}

[Rassah]

I just read this issue on github and I'm considering moving to other wallet... It's a big no-no if it depends on proprietary services. _{Though I know sometimes there is no alternatives, but thats not the case here.}

1. We have no issues with anyone contributing to Mycelium codebase, just as long as the final code is implemented in the main Mycelium version. If for whatever reason development stops, that would be either because the project is abandoned (it would be opensourced), or the company folded (it would likewise become opensourced).
2. Agreed, though we still have independent developers helping out at times. Ideally, of course, we would love a whole lot of independent developers helping.
3. So far Mycelium is way way way ahead of all other bitcoin wallets, so that's not a problem.
4. F-Droid is one app store. You can just download Mycelium directly from our website, so it's not that big of a deal.

While we do depend on a proprietary server, that's only to receive address balances, broadcast transactions, and for our LocalTrader function. We may also eventually use our servers for CoinJoin announcements, so people can easily mix their coins. And we do plan to add SPV support so that the wallet is still usable if our servers become unavailable for whatever reason. Other than that, we are actually trying to be more open, not less. The Trusted Computing thing is actually us opening the wallet for two third-parties to add their own code to it to allow our wallet to use TEE built into phones. Just as we have added support for Trezor, and are allowing Ledger to add support for their wallet.

All that said, as Jan mentioned, we are trying to push to switch to open source license.

[elasticband]

can the devs enable a statistic where the buyer can see the named exchange price used and the % added..... transparency and all.

I have my price set at a certain % but i have a regular buyer who i offer a discounted % and i always must adjust the price for him but for the sake of being transparent i also show him me making the % adjustment on my screen and then offer him to accept the new price. I just think the buyer should see the % gain without having to break out his calculator..... transparency!

[Gisado]

I just read this issue on github and I'm considering moving to other wallet... It's a big no-no if it depends on proprietary services. _{Though I know sometimes there is no alternatives, but thats not the case here.}

1. We have no issues with anyone contributing to Mycelium codebase, just as long as the final code is implemented in the main Mycelium version. If for whatever reason development stops, that would be either because the project is abandoned (it would be opensourced), or the company folded (it would likewise become opensourced).
2. Agreed, though we still have independent developers helping out at times. Ideally, of course, we would love a whole lot of independent developers helping.
3. So far Mycelium is way way way ahead of all other bitcoin wallets, so that's not a problem.
4. F-Droid is one app store. You can just download Mycelium directly from our website, so it's not that big of a deal.

While we do depend on a proprietary server, that's only to receive address balances, broadcast transactions, and for our LocalTrader function. We may also eventually use our servers for CoinJoin announcements, so people can easily mix their coins. And we do plan to add SPV support so that the wallet is still usable if our servers become unavailable for whatever reason. Other than that, we are actually trying to be more open, not less. The Trusted Computing thing is actually us opening the wallet for two third-parties to add their own code to it to allow our wallet to use TEE built into phones. Just as we have added support for Trezor, and are allowing Ledger to add support for their wallet.

All that said, as Jan mentioned, we are trying to push to switch to open source license.

Ok, thanks for the long answer;

The problem is, if whatever reason development stops, someone can take the code, implement SPV (instead of proprietary server), but he cannot publish it because the license forbids it. "The freedom to view the code" is not enough, we need "the freedom to redistribute the change".

[elasticband]

can the devs enable a statistic where the buyer can see the named exchange price used and the % added..... transparency and all.

I have my price set at a certain % but i have a regular buyer who i offer a discounted % and i always must adjust the price for him but for the sake of being transparent i also show him me making the % adjustment on my screen and then offer him to accept the new price. I just think the buyer should see the % gain without having to break out his calculator..... transparency!

maybe?

[jdebunt]

Been putting off using Mycelium for no other reason than pure laziness, but as I'm looking for a better Bitcoin wallet than Blockchain.info, I might need to give this a try sooner rather than later.

[molecular]

I have to congratulate the mycelium coders for an awesome implementation of trezor support. Fits right in!

Thank you!

[EstefanTT]

Hey guys,

I have the Mycelium for a few month and I've used it to send a couple of Bitcoin in a crowdfunding.

In order to claim my share (for the crowfunding) I need to export out of Mycelium an WIF private Key to enter in the client.

I'm kind of lost because I saw that I have 24 private keys in my account, each one produced with for a single transaction.

I try to go to My account > export > private > there I have a very long string of number and letter. Not a classical private starting by 5.

Here is a example I made (obv, it's not mine )

xprv9yeLA9Z8kueAeFhWu4rK6uJjkSEUT3oXZarqQvVHZxcqSdjbuAA42ftgetYLHeXDtLgDjXGoSb2 Qr82Ga3nAJGUCZfy7RoqwkoR22hsmRL10

Is it that the wif key ? I've imported it in the client but nothing happenned.

[Michail1]

Uhhhh, real fast response.

There is absolutely NO reason to give someone your private key.
Not only does that give them access to spend any funds in your account, it puts your private key over the internet where it could be intercepted or accessed if the website you post it to is hacked at anytime.

Are you sure this is your intent?

Also, your private key is to the account, not to a specific address in the account.   mycelium doesn't export a specific private key to a certain address in the account.  You need to use a tool like pycoin to get a key to a certain address.

[madmat]

Hey guys,

I have the Mycelium for a few month and I've used it to send a couple of Bitcoin in a crowdfunding.

In order to claim my share (for the crowfunding) I need to export out of Mycelium an WIF private Key to enter in the client.

I'm kind of lost because I saw that I have 24 private keys in my account, each one produced with for a single transaction.

I try to go to My account > export > private > there I have a very long string of number and letter. Not a classical private starting by 5.

Here is a example I made (obv, it's not mine )

xprv9yeLA9Z8kueAeFhWu4rK6uJjkSEUT3oXZarqQvVHZxcqSdjbuAA42ftgetYLHeXDtLgDjXGoSb2 Qr82Ga3nAJGUCZfy7RoqwkoR22hsmRL10

Is it that the wif key ? I've imported it in the client but nothing happenned.

Could you give any link to this crowdfunding ?

[trasla]

If you need to prove ownership of the address, please just sign a message with the corresponding private key. This will show you own the key without revealing the key. To do so, select the account in mycelium and then select "sign message" from the action bar menu. You will get to pick the address you want to use, and can then proceed to sign something like "I, <your name> want to claim my share of <xyz>". Send the signed message over to prove your ownership.

If you share the key starting with xpriv, you grant whoever gets it access to _ALL_ current and future private keys in that account, as described in the warning you see when exporting it. So if you later receive funds to that account, they will be able to steal them. Mycelium does not allow to export single keys from HD accounts, if you really really want to do that and perfectly understand what you are doing, you will need to use an external tool for that.

[btchris]

Mycelium does not allow to export single keys from HD accounts, if you really really want to do that and perfectly understand what you are doing, you will need to use an external tool for that.

As I'm sure trasla and the other Mycelium devs know, exporting a single private key has hidden dangers which can lead to a loss of some or even all funds stored in the account. The conscience decision to not support this feature is a very wise one.

EstefanTT, if you're not familiar with using external tools as trasla mentioned, you're likely not aware of the dangers involved (so just don't do it )

[EstefanTT]

Thanks everyone for such great explanations.

The crowdfunding is done since january. It was for BitShares Play. A decentralised platform aiming implementation of games using token and needing provably fair random numbers. It's powered by BitShares (obv )

I'm not giving the private key to anyone. In the client on my computer, protected by my password, there is a place where you enter the private key you use to send the BTC during the crowdfunding to claim your PLS (token of the platform). It's basicaly like importing a private Bitcoin key from a wallet to another.

There is a place to import with a WIF key.

The only thing I still don't fully understand is what is that long string of letter and number Mycelium give mi as "private" info when I try to export.

Is it some kind of WIF key from Mycelium. Is there a way to convert it in a WIF key.

[trasla]

The key you get when exporting the private info from an account is the account root, so called xpriv key. Its not in WIF, because it is not like a single prvate key - instead, it is the key from which all private keys in that account are derived.You could use a tool like this: https://dcpos.github.io/bip39/ to input a master seed word list, and see the xpriv key and all the addresses and private keys generated by it. DONT JUST INPUT YOUR WORD LIST ON THAT SITE! If you really want to do that, at least store the site offline. Please make sure you understand the security implications and risks of typing in your master seed or a private key into some application on some computer.
If I were you, I would first ask the provider of that crowdfunding tool to please allow to prove ownership via a signed message instead of providing the key. Maybe signing a message is all that desktop tool you got actually does. Second best option might be to move all your funds away from the wallet based on that master seed to another one (backup first) and then extract the key you need with some tool. Then never use the old wallet again. Unless you are very good at IT security, you should always suspect that your pc is compromised and you will compromise your bitcoin wallet by typing in backups / word lists / keys.

[molecular]

I'm not giving the private key to anyone. In the client on my computer, protected by my password, there is a place where you enter the private key you use to send the BTC during the crowdfunding to claim your PLS (token of the platform). It's basicaly like importing a private Bitcoin key from a wallet to another.

That's not such a good idea.

You probably should've generated a single private key for paying to the crowdfund. But it is what it is now.

Maybe the devs can switch things over to a new key you provide if you prove ownership of the key you used to send initially. I would explain to them that you don't want to export a private key that is part of a hd wallet because of the security implications.

[EstefanTT]

That wallet is not imortant, I don't have funds in it. I will probably erase it and make me a new one after it.
I just need to exctact the private key from the wallet.

I try offline the " https://dcpos.github.io/bip39/" with the mnemonic words from my account.

It generate a lot things. Also a lot of address, public and private.
I'm aware of the risks of what I'm doing.

I'm almost there but I still doesn't understand something. How do I find the private key with all the information this script is giving me from the mnemonic words?

I have the public key I used to send the money. Do I need another tool or can I use this script to find it ?

[btchris]

I'm not giving the private key to anyone. In the client on my computer, protected by my password, there is a place where you enter the private key you use to send the BTC during the crowdfunding to claim your PLS (token of the platform).

I'm sure you're sick of hearing this , but any dev who developed a system like this in lieu of a signature scheme probably doesn't know what they're doing... I'd be very wary.

I try offline the " https://dcpos.github.io/bip39/" with the mnemonic words from my account.

Make sure you click the BIP44 tab. If you have multiple Accounts in your Mycelium wallet, you'll need to modify the account # on that page as well (the number 0 corresponds to what Mycelium calls "Account 1", the number 1 corresponds to "Account 2", etc.).

I have the public key I used to send the money. Do I need another tool or can I use this script to find it ?

Do you have the public key, or the address? A Mycelium address starts with a 1 (as I'm sure you know). A Bitcoin public key typically starts with a 02, 03, or 04, but it depends on the encoding used.

If you have the address, simply find it in the displayed list. The WIF-encoded private key is to its right.

[Michail1]

It generate a lot things. Also a lot of address, public and private.
....
How do I find the private key with all the information this script is giving me from the mnemonic words?

What?  You see the private keys, but you're looking for the private keys?

Please explain how you see it, but you don't see it.