There will be 5 on-chain colors again. Black, green, blue, yellow and rarest red.

source: me, we develop this stuff together with post

Right now, the best option to get those is the classic online store.
All OnChain aspects are visible only with a Web3 Browser. The very limited edition of 500 OnChain store is now basically sold out due to the price increase. There is a secondary market on opensea

My company developed all the blockchain aspects around this.

you know that there is a bot that hands out testnet coins for free (virtual trader)

i am pretty certain multibit HD is fully compatible with the mycelium seeds, and it uses a completely different implementation stack and infrastructure. so you will be able to use it, even if mycelium servers completely vanish.

using the trezor together with mytrezor.com is another option with another distinct stack.

no it does not. mycelium only queries the index servers when it is shown on the display. you see the "sync" icon on the top right spinning when its happening.

mycelium does a 20-address lookahead on the main chain. if you would do the same trick with an index further out, it does not work.

thanks a lot for bringing this to our attention.

Mycelium iOS and Android have unfortunately different xPubkeys:

for the first account, Android uses
    while iOS gives you
    These pubkeys have different purposes: the Android Pubkey allows tracking of all incoming addresses and change addresses.
The iOS Version excludes the change addresses and only provides the "external chain".

We talked about this internally, and the iOS version will change, Since the m/44'/0'/0' version has a few usages today, and of course we want compatibility.

The master private key is always 256 bits. A 12 word backup has 128 bits of entropy. https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki

The strength of ECDSA inversion from pubkey is 2^128. So some people (including me) think 12 words / 128 bit is sufficient, and longer wordlists may otherwise lead to people not doing backups.

The default for mycelium is 12 Words. At the first startup, If you import a wordlist from an external source you can chose 18 or 24 words also, with optional password.

nice, i think this architecture is much better than the old greenaddress html thingie.

some remarks:
i sent 100 mBTC from mycelium to greenbits. it came over as "100.000" bits, while it displayed "$ 21.61" so the "thousand-mark" was the same char as the comma - incorrect and confusing.

the time received was "59 minutes" although it was just 10 seconds ago.

i wondered why it could not generate new deposit addresses offline

the qr code is "blurry"

there was no way to switch the unit bits to full bitcoins or mbtc. ( after testing more, i was able to change it in "send" but i really expected it in settings)

when trying to send back recently confirmed coins (2 conf) - i got the error msg "you need to wait 6 confirmations" - this was likely because i checked the "instant confirmation" - if this is not possible why not hide it/grey it out

when entering amounts (10 mbtc) my phone turned the screen off and on - it was changed to 9.96.. something. (also when rotating phone)

when ending the wallet i have to type in the full 24 wordlist - if i had just checked the button without actually doing the backup my coins would be gone now. i suspect the next thread will be "please help me recover my funds from greenbit" - many people just check boxes without reading it - or they make a mistake in writing down the pw. there seems to be no way to actually test the seed before depositing money.
the default should be to remember the seed and just check for pin (which i did not set)

yes, this is planned for the next version. you will be able to select any number of fiat currencies, including 0.

yes, this is a known bug. it could be fixed - but it is some work to do so and it is harmless.

if you want to contribute to the translations, drop me a pm with your email, i can send you an invite to our crowdin system. if you do it via pull request it is a bit harder for us to integrate.

in the next beta version 2.2 which is planned in january.

note: you made the backup in june it was still for the 3.x version of A.S. Bitcoin Wallet. Mycelium did include an importer for single private keys from that time. if you download mycelium 1.3.3 for example from http://mycelium.com/assets/btcwallet/mbw-prodnet-release-1.3.3build133.apk you might be able to get back your key (start mycelium->accounts->add key->import schildbach wallet) i did not got through the whole thread but it might help you.

use an emulator to restore your funds, maybe move your funds to a fresh paperwallet or fresh seed.

legacy accounts are single address accounts - i recommend you move your money to an HD account and keep the 12 word backup safe. if you are still receiving money on the legacy account, you can make a seperate backup of those keys by looking in "settings", there is an option to export all non-HD keys.

We had multiple crash reports from Nexus 6 devices, with out of memory.

Since we don't own any N6 yet, it would be great to hear how it is possible to reproduce a crash.

v2.1.0 has been released to https://github.com/mycelium-com/wallet , https://mycelium.com/bitcoinwallet , beta channel and very soon also staggered release to general channel.

Changenotes from 2.0 to 2.1:

*) Optimized output selector that omits dust from transactions and makes fees smaller on average
*) Fallback geocoder
*) New NFC function to push payment request
*) Show total amount of coins in accounts view
*) Customizable fees
*) Pin reset function with a 7 days enforced delay
*) Fix crash if you don't have a flash on your device
*) Preview of secret sharing import/cold storage - Compatibility for Mycelium Entropy
*) Ability to delete Mycelium Local Trader accounts and trade sessions
*) Bugfix for synchronizing single address accounts with a zero balance: now allows you to view the history
*) OKHttp - connection pooling for faster syncing (preparation for orchid integration)
*) Button for each account to manually resync (in case of possible malleabilty, or otherwise getting strange sync edge cases)
*) Removed permissions no longer needed due to version upgrades (account, SDcard)
*) Now requires Android 4.0 - 2.2 is explicitly no longer supported.

There is a minimum limit for standard outputs, 5460 satoshis. if such an output is part of a transaction it is considered nonstandard and will by default not be relayed. (and thus not mined)
Mycelium makes sure that your transactions have a chance of working and does not produce change outputs that are smaller than this limit, so the rest <= 5460 satoshis is included in the mining fee.

the reason is, on average such outputs can not be spent economically because they make the transaction bigger. some more background info is here:
https://www.reddit.com/r/Bitcoin/comments/1drocs/to_everyone_wringing_their_hands_over_the_recent/

there is a bug that leads to android 2.2 being unable to multiply big numbers _sometimes_. previously this mostly just lead to wrong TX being generated, that were rejected by the network. annoying, but no huge risk.

now with HD wallets it is possible to generate a wrong address from a seed that has no matching private key. this is bad. therefore, quit using it we had one case where a user reported this, and we strongly think android 2.2 was the reason.