Bitcoin Forum

OK folks, I have them in hand.  

cost is .10 0.15206813 per unit.  please send btc to 1Ex5CHXBPGSw93LSpMUeZxwt71XYaANMzv
I will not PM you any payment addresses.  Use only the address posted here.  (scammers/imposters will try to contact you)

email me a shipping label to canary.btc@gmail.com
The from and to addresses are both yours. Designate shipping from 60181 zip code.
also you must send btc from an address you can sign a message with.
when emailing me a pdf shipping label, in the body of the message include one of the input  addresses and sign your tracking number.  so that might look like this (example only):

1Ex5CHXBPGSw93LSpMUeZxwt71XYaANMzv
9361589178306211219122
IJ3gQyVz1vqg04bV2HjyPFCYzLiOlEFMfr3a9lveoOp+c9UwiF/CEdgxnM5QUtvf+AilrPHJ6jMDC39lBLjcLJU=

8 units fit into a small priority flat rate box

the first people who have first priority are those who posted here expressing interest.  I've PMed you.

list of printers that had been tested by the maker:
https://www.reddit.com/r/Bitcoin/comments/2xp6ss/mycelium_entropy_update_for_monday_march_2nd/

Delivery depends on Mycelium production dates, I have no control over them.
Currently scheduled for October 2014

now in hand and shipping

lol. 2 please

5 please

2 please.

  when do you want the funds?

when I open the group buy, if I do

I'd buy one for $27.

Put me down for 2

I would take one or two.

In for one.

Super interested (4-5)

Yea sure!

Yup. One at least.

interested (2)

I should be receiving them hopefully by week's end.  Will update OP with price info etc...
Also, you can get one for free via a reddit giveaway: https://www.reddit.com/r/Bitcoin/comments/2z9b9k/win_a_mycelium_entropy_usb_paper_wallet_generator/

I would be interested in one.

If it's still possible :P

That looks like a fun thing to have. Though I'm not sure whether there are a lot of people who need to print several of them :)

The only issue with the concept device is the fact that some printer has a buffer which contains the printed data and it won't be deleted.

They don't talk about it but they are saying "use it on a printer that you can trust".

Well, maybe if you print out some dummy pages after printing the paper wallet, the buffer'll forget an eventually compromising cached page.

They are arriving tomorrow if USPS delivers as expected...
Once I get them and all looks good, I'll post more info in OP...
I'll contact folks here who've expressed interest, the rest of inventory will be first come first serve...

Sounds like an interesting device.

Looking forward to the details to pick one up.

I'm still interested in a couple.


Printer buffers are usually stored on the computer sending print jobs. If a printer has a buffer of its own, it would most likely be stored in volitile memory and cleared once you power off the printer. For maximum safety, you could always throw the printer in a fire after printing your wallet ;)

I'm more concerned about the technology producing the entropy. I'm not really familiar with static RAM cell power states as a source of randomness, but hope that the technology was implemented correctly and is generating truly random numbers.

some printers have hard drives, so you'd want to carefully examine your printer's features to make sure you don't end up with a copy of your wallet on a printer's hard drive.
this post is a good starting point:
https://www.reddit.com/r/Bitcoin/comments/2xp6ss/mycelium_entropy_update_for_monday_march_2nd/

Besides using static RAM, we have also added the built-in RNG chip, and gate noise as sources of entropy. You can also add your own Diceware salt to it just to be doubly-sure, and it will print out a hash along with the paper wallet to prove that the salt was used correctly.

Sent the btc and the address in a signed message to the email, thanks canary!

thank you! shipped out.

I decided to (with lead in my shoes) to pay up to Zeushash to make sure my GHs I contracts weren't cancelled there so at this point I won't be buying one, sorry.

Hi, Do you have any left?

Yes, they are available... If and when they run out, I will close this thread.

Just emailed for 1.

Thanks!

thanks! shipped out

Received the mycelium, thanks canary; Do you know how can i check the flashed firmware? Got no answers on the support subforum here.

Thanks.  Received Saturday.  Plugged into printer and hit print.  Works!!

I think you're looking for this: https://github.com/mycelium-com/entropy/tree/master/verify

These are still available if anyone is interested in them...

updated price to .1 per unit

Still available? and is .1 still the price?

Yes, still have some!

Shipping to EU?

I don't but you can probably find a re shipping service

Do you ship to Canada?

And I will like to understand a little bit more entropy. I know its to make paper wallet but how can you create a wallet offline? Not sure to totally understand.

Thanks

If you can ship to EU im intrested in a big lot of these

The little USB device is actually a computer, with a processor, memory, and storage. When you plug it into a printer's USB port (the one used to print photos off of), the computer powers up, grabs a bunch of sources of entropy to create a HUGE random number, then uses that number to generate a private key and bitcoin address. Then it created a JPG image with that key and address on it, along with QR codes, and presents itself as a plain USB drive with a photo on it. Your printer detects a photo, and asks if you want to print. After you print the paper wallet and pull the Entropy out, its memory is cleared and that JPG with your wallet is gone for ever. Only your paper copy remains.

https://www.indiegogo.com/projects/mycelium-entropy#/story

Thanks for the explanation. I do understand this part. The part that I dont understand is how you can create a bitcoin address offline?  :-\
And be sure that this address doesnt exist already?

You take a random number - between 1 and ridiculously large (7.237*10^75 and change) -
https://en.bitcoin.it/wiki/Private_key#Range_of_valid_ECDSA_private_keys
( Tip: don't 'randomly' choose the number 1.. or probably anything between 1 and a relatively small number, as those are probably in a lookup table somewhere.. you'll want to pick a number somewhere in the ridiculously large range )

That's your private key.  Use ECDSA to get the public key.  Then you hash that, hash it some more, double-hash that some more for an error correction chunk, concatenate bits together, base-58 encode it, and you've got an address.
https://en.bitcoin.it/wiki/Elliptic_Curve_Digital_Signature_Algorithm
https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses
https://en.bitcoin.it/wiki/Base58Check_encoding


You can't be 100% sure, but let's say I pick up a grain of sand, call it 'mine', and now I drop it from a plane somewhere over land, somewhere in the world, and now you go pick up a grain of sand yourself.  What are the odds of you picking up my grain of sand? (7.5*10^18)
Now realize that the odds of you generating an address already used by somebody else are even smaller (7.923*10^28).  At least, as long as the code is solid :)

To add to that, the Bitcoin network doesn't care what address you send money to. It doesn't bother verifying if the address is legitimate or exist. The only thing it cares about is that the address you are sending from has a matching signature made by the private key. So when you send to paper, it doesn't care, but when you spend from paper, that's when you use the private key on that paper, and is the only time it cares.

Thanks to both of you. That clarify a lot of thing!  ;D Nice metaphore realsteve!   ;)

Are these still for sale?

Yep, still have some

Sent payment, mailing label and signed message, thanks!

shipped out. thanks!

Great service, thanks for the very fast shipping!

Very cool little device.

Security seals were broken (as expected), flashed firmware and added a salt, working great.

https://i.imgur.com/OQsKDu3.jpg

why broken security seals are expected?
are there instructions re use-i am not sure which firmware you were flashing and why (update from mycelium?)
how one adds salt?

thanks

The security sticker on the box is a foil circle on the side, pretty much any pinch on the box (or just general handling) can make a seal look broken.

The security seal is an afterthought, entropy is secure without it.

To flash the firmware to the latest version (with signature verification) follow these instructions:

https://mycelium.com/assets/entropy/me.html#_firmware

To add a salt (and I don't know why you would not) follow these:

https://mycelium.com/assets/entropy/me.html#_salt

Edit:

The up to 32 byte salt looks like this:

e6 db 7a 87 f1 8f 4c 15 05 df 11 7f 77 39 22 32 3f 81 28 ea 77 69 15 21 c8 d5 a2 c7 d9 bc 9a 40

Random sample: https://www.random.org/cgi-bin/randbyte?nbytes=32&format=h

and can be generated any way you want...

When using a salt Entropy displays it's own entropy on the printed paper wallet allowing you to verify that your salt was included in the entropy for the keys printed (see bottom of image above).

Limited supply remains.  If you've been thinking about getting one, you should do so soon.  They are almost gone...

I'm wondering, is this product already sold out or still available to buy???

I have a few left

I have 1 unit remaining.

pm sent if one is still available let me know

you got the last one and this group is now CLOSED.