Bitcoin Forum

OPENDIMETM

Opendime is a small USB stick that allows you to spend Bitcoin like a dollar bill. Pass it along multiple times. Connect to any USB to check balance. Unseal anytime to spend online. Trust no one.

- Lots of info here https://opendime.com/
- Video here https://www.youtube.com/watch?v=1LrKLsZYGjQ
- FAQ https://opendime.com/#faq
-First batch order sold out (SHIPPED!)
- Order Second Batch HERE  (https://opendime.com/cart)  
-v1.1 Multi-language user interface: 中文, 日本語, English, Portuguese, Français, Deutsch, Pyccкий


FEATURES:

USB DRIVE: Acts like a read-only USB flash drive. Works with any computer, laptop, and phone. A QR Picture and Text file inside contain Bitcoin address and support.

ULTRA SECURE: The private key is generated inside the device, and is never known to any human, not even you!

COMPATIBILITY: The Bitcoin world changes fast but Opendime is built on the fundamental Bitcoin features that haven't changed in five years.

NO TRUST: Give an Opendime to anyone and they don't need to worry that you can take back the funds later. You've got the private keys in the device.

FREE TO USE: This is physical Bitcoin as it was meant to be: just hand it to someone and they've got it. Pass it on multiple times! Simple as a handshake. No miner fees, no confirmation delays.

OPEN STANDARDS: Uses Bitcoin message signing, normal (non HD) bitcoin payment addresses and private keys in WIF format.

...

nvK, thanks for opening a thread on Opendime.  I have been following occasional news on it for about a month or so.

I look forward to user reviews.

What I THINK I like about it is its minimalist design and one task use.  That will keep costs down and make it less vulnerable to security problems (those more knowledgeable about security, PLEASE comment!).

The opendime looks like it will fill a nice little niche: buy BTC once, pass the device around as payment,and anytime the owner wishes to be paid there it is.

That's spot on.

Update: Shipping Opendime first batch 2 weeks ahead of schedule, w00t!

Get on the second batch: https://opendime.com/

The original holder doesn't know the private key, so the receiver can still pass it along again.

UPDATE, First batch shipped today!

https://twitter.com/coinkite/status/727628795663011841


https://pbs.twimg.com/media/ChkOiFVVEAALNL7.jpg

Many have already received their Opendime! Unboxings http://blog.coinkite.com/post/143942909006/opendime-unboxings

I am interested, but would very much welcome reviews (especially re moving the BTC out of the unit when once broken open).

nvK:

The information at opendime.com is not very clear (to a relative newbie like me) as to how move the BTC!  Yes, I read about the private keys (etc.), but maybe you could write here (or at your website) more information on exactly how that is done (ie "for dummies").

You might get more sales...  :)

I think we can make it more clear on the site.

But the device once broken shows you the private key, you can just sweep that with Copay for example.


https://i.imgur.com/lNxiZz9.png

https://i.imgur.com/VUXJidq.png

We are finalizing the next firmware version, feedback welcome!

Feel free to send it here support@opendime.com

Why didnt I think of that!? Great idea.

Updating firmware is a problem for me.  Often I have bad results no matter what the device is.

Simplicity..............  "K.I.S.S." is a good saying for a reason.

And please let us know when you will take Bitcoin as payment.  Last I looked, it was not an option.

Thanks, and the best of luck with your product.  Done correctly, you will fill a wonderful niche.

We are looking for feedback for the next batch.
Opendimes are not upgradable, for security reasons you cannot flash them. The firmware is "burned" in.


On the todo list, hopefully soon.

I'm very interested in buying a few of these, but you guys only accept Credit Cards. Any possibility to pay with Bitcoin?

---

---

I might try and do a group buy for these as well. Seeing as they are relatively cheap and I'm sure a few people would like them.

I spent some time on Opendime site trying to figure out how much this piece of hardware cost.
And it turns out it is only visible if you are filling out shipping information, not the best idea imo.
Also as others already pointed - I was disappointed to see you are accepting only credit cards payment.
Because of that I won't be able to buy it unfortunately as I don't have credit/debit card.

We will have a Bitcoin solution soon, we are swamped with other stuff right now.


If you'd like we can process a couple orders by hand, just send your quantity and shipping address to support@opendime.com and we will send you a bitcoin address to pay.

Alright, sounds good! I'll boot up a group buy and get back to you (but please reserve three already, as I want some for sure). ;D

Cool, please start a thread with support will help with the count.

...

I'm just about to leave town, so will have to check in when I get back.  Please have that BTC payment option up & running if possible when you can.

Your device looks like it will work very well in its niche, there apparently is nothing else like it.  I look forward to test-firing it sometime.

That's really nice ! But does the computer that will receive the USB stick will need to be connected to the internet in order to receive the money ?

In that respect it's similar to a paper wallet, it doesn't have to be online to get that private key. But like any other wallet, once you want to make a transaction, you need to broadcast online.

The privacy advantage here is to be able to give this to another person, and another person and so one without having to go online to sweep the key

It is quite sad that you still do not even accept bitcoin for purchases. I wanted to get in on the first batch but you did not support bitcoins then and still dont now.

We are swamped, haven't had a chance to build a combo shopping cart yet. Soon...

Price is kind of high but good idea.

It's the cheapest hardware wallet out there and can be used multiple times before it's unsealed!

I like your project... I've been thinking about getting some and either using them as a crowdfunding reward.

Suggestions:
Add the bitcoin logo  ;D

Thanks for the suggestion, space is tight but its a great idea. Maybe on the version after.

I really like these!  I think they could be used to initiate newbs to storing and transferring bitcoin.  Or just to have a cheap disposable wallet!

My biggest issues is my paranoia about any kind of hardware wallet device, whether it is this or trezor, etc: that there may be malicious code built in to steal the bitcoins. 

I know I am paranoid.  I will freely admit it.  So, how can you guarantee that my btc are safe?

Thanks!  I know it must be tough convincing someone like me, but I definitely would buy some if I was pretty certain they were safe.

The FAQ on their website should answer your question:

On top of that, you could unseal and get the WIF (private key) offline and never connect the Opendime to anything after that. Since the OD does not connect to the internet, it's not possible for it to move funds without you

A quick note, the second batch will have multi-language user interface!

中文 • 日本語 • English • Portuguese • Français • Deutsch • Pyccкий

...

nvK

It sounds like your new wallet is moving along very well.  Congratulations!  I strongly suspect that once several reviews of OPENDIME appear here at this forum (reddit too I suppose), that your sales will be excellent.

But, I agree with above comments that as soon as possible you should have a Bitcoin payment system for purchases.  I hope to be one of the first to order once you have a secure system in place.

I mentioned your product once at Zero Hedge a few weeks ago.  Even though ZH members tend to be against Bitcoin, s knowledgeable member or two thought that your product was a most excellent idea.

Get that production cranked up, resolve the security doubts that some here have, and offer BTC payment as an option, and I suspect your product will FLY....

Thanks OROBTC, we've been taking a bunch of new sales for BTC manually via support and hope to start coding a new shopping cart soon.


On a another note, we have the release notes for this next batch!

1.1.0

• Download Example  (https://opendime.com/downloads)
• Added 6 translations: 中文 • 日本語 • Portuguese • Français • Deutsch • Pyccкий
• The red LED briefly flashes in startup mode (was off before)
• A 32-byte, binary user-supplied message can be signed over a new USB EP0 interface.
• New code in advanced/trustme.py to test multiple signatures, and more low-level checks.
• Bugfix: Updated URL for Bitaccess.co (was .ca)
• Bugfix: Drive didn't always eject/reappear properly on El Capitan
• Bugfix: Advanced/variables.json showed PRIVKEY_XX... when sealed, now blank instead
• Performance: disk read performance has been improved.

Neat!

https://twitter.com/jgarzik/status/741275585939267584

https://twitter.com/jgarzik/status/741281079265370112

I like the idea only problem I see is if you use this long term and it malfunctions there is no back up

Yeah, it's not recommended for long term storage since there's no way to backup the private key (at least in the current version) according to the FAQ. Still a good solution for those looking for something between a physical coin and a paperwallet.

The lowest price Opendime package is a pack of three Opendime for $37.50. With Postal Mail shipping to US total cost is $46.20. That works out to a cost of a little over $15 per Opendime. In comparison you can get a full featured Ledger HW.1 hardware wallet shipped free to US for $18.

I do not understand the logic of making a customer start to place an order before price can be seen. Also, you really should have integrated bitcoin payment using Bitpay or Coinbase from the start.

Opendime is not a direct competitor to Ledger, is meat for a completely different use. In this model, no user knows the private key! So it's less of a wallet and more of a bearer bond.



Our bitcoin shopping cart is almost ready, we've been taking orders via orders@opendime.com for Bitcoin. We've sold a lot in bulk to resellers too, which will likely sell in brick and mortar "retail near you" with no shipping cost. We are looking for a better carrier deal, but this product is not paper thin like ledger so it is not as cheap to ship.


@BitcoinNewsMagazine I would strongly suggest you take a close look at our FAQ and other material on https://opendime.com, a lot to be learned there.

Second batch update!
The new boards are being populated at the factory this week.

https://i.imgur.com/nospUD2.jpg


If you haven't reserved yours, do it soon! (https://opendime.com/cart)

If you don't want to pay via CreditCard, we've been taking orders for BTCitcoin via orders@opendime.com until the new shopping cart is ready.

Sorry no interest here in OpenDime. I do have some experience marketing and selling on the web, just pointing out that your potential customers want to see the price up front and pay with bitcoin. You probably have lost customers by not making the web site clearer and incorporating bitcoin payments from the start. Good luck with your project.

We have sold-out the first batch in the first few weeks and have sold the second batch (much bigger) extremely well.

I don't disagree, we have the bitcoin cart on the way :)

Pull Request to add it to Bitcoin.org open!

https://github.com/bitcoin-dot-org/bitcoin.org/pull/1319

Production Updates
2nd batch of @OPENDIME on the way from the factory! ✈️  (https://twitter.com/opendime/status/753243404679516160) Get yours opendime.com (https://opendime.com)

https://twitter.com/opendime/status/753243404679516160


https://i.imgur.com/yuW9owh.png
https://i.imgur.com/zamBHgl.png

...

That is very good news, nvK.

A low cost and easy to use hardware wallet is likely to do well.  I hope that we get some reviews.  If your product works well, you may want to start planning your third and fourth production runs.

When do you expect to be able to ship this new batch?

2nd Batch completely shipped,

and now we have Opendime IN STOCK!

Order here https://opendime.com/cart

...

Hi NvK

I just ordered some OpenDime wallets.  I look forward to experimenting with them.  :)

*   *   *

At your website, you write that "properly stored" the OpneDime should be OK for decades.  But, not meant for long-term storage.

I would LIKE to store some of my BTC for a long time!  I would appreciate your comments, it's OK to write them here for the BTC Community here at bitcointalk.

*   *   *

It is still not crystal clear to me how it works (from the user standpoint), I have watched the video.  I'll ask more specific questions later if I still have them.  It may be easy to figure out once I have them in hand.

Please PM me with a phone number "just in case".  I do have a "secret word" should I ever have to call.

Because you can't make a backup of the key, it's not advisable to use it that way.

A nice review by Beatyon; Exquisite OpenDime https://medium.com/@beautyon_/exquisite-opendime-ad1195a2790e



 read whole post (https://medium.com/@beautyon_/exquisite-opendime-ad1195a2790e)

Neat fan made video by the Friends of Satoshi

https://www.youtube.com/watch?v=9UFF9d3Y1BY

...

I received my Opendimes today, and had time to try one out.

Ordered July 27, paid by Bitcoin.  Arrived today (Aug 8th).

Device measures about 4.5 cm by 1.0 cm.  Small!  The Opendime fit right into my USB on my laptop.

Several files and a couple of folders are visible upon clicking open the device.  The README file is the important one at this stage.

I had to input text and spreadsheet files to reach the 256 kb for the device to generate the public/private key pair.  Pictures of 2 MB not accepted!  After doing that, you can open a small file to see the wallet address and another to view a QR-code.

*   *   *

Taking the funds out was more difficult for me.  I was hoping that either my Trezor or my Ledger Nano would have a procedure to import private keys, but in BOTH cases I could not do it (or could not find out how).  So I had to use my blockchain.info wallet (which does have a way to import keys).  It was a little hard for me to navigate my way around the *new* blockchain.info wallet, but the instructions are in there.  Once I imported the public key (wallet address "on" the Opendime), I then asked for a transfer of BTC to my regular blockchain address.  blockchain then asked for the private key (Opendime), which I pasted in.

Bingo, transfer made.

Device works.  I bought six of them for $94.80 in BTC, works out to US$15.80 each (total, including shipment).

*   *   *

My only suggestion to Opendime would be to write their instructions more clearly for relative beginners (like me).

You probably will need another wallet on other devices (on your PC, other hardware, or an online wallet) that accepts importing public & private keys.

So it is expected that you would pay with these devices in the absence of Internet access (offline mode of operation), right? But how the other party can check if bitcoins are still there, they haven't been spent, and you are not going to spend them later after you give away the devices (read you still have the keys)?

Keep in mind that everything happens in offline mode (i.e. without Internet access)

...

Hiya deisik,

You are asking questions that are perhaps best asked of nvK or someone else there at Opendime.  I am not a programmer or computer pro, I had to learn as an autodidact (I got very little help, and NONE of my friends are into this) to just get this far w/ BTC...

Nonetheless, this is how I will probably use them:

-- Put in a "round amount" (say, BTC1.000) into one or more of them.  Now I have an Opendime with +/- $585 in it.
-- When the occasion arrives, I will "pay" or give BTC away by just giving the Opendime itself to the lucky recipient.
-- You can get the Public Key (wallet address) by putting the Opendime into any normal USB slot, and reading the little file.
-- Then you can check the balance of that address (so, yeah, you would need Internet access to do that).
-- The PRIVATE KEY is unknown to anyone (as it is generated when you paste stuff in to initialize it), so cannot be spent until:
-- Whoever the owner is who wants to SPEND the BTC then breaks off that central stick-shaped piece (w/ the small gold "lock" logo).
-- Then you can go read the Private Key in a small file, then you can import that Public & Private Key to a wallet that can IMPORT them.
-- As Opendime says at their website, you DO need a wallet that can "sweep" or will import the keys (blockchain's will work).
-- And once you take out the BTC (preferably very soon after breaking the stick-shaped piece), then you chuck the unit (no longer secure).

So, it's really more of a "wealth preservation" device, you can get the BTC out, but not by spending them in the normal manner.  The idea is to load some BTC, then give the DEVICE away as payment (or partial payment).  In that sense, no BTC is transferred on the blockchain, you are giving away the device, but you (no one) knows the Private Key until that stick-piece is broken off (there is a video showing that at their website).

You could give one or more of them away to loved ones very quietly for example (assuming you mixed the BTC before sending them to the Opendime).  With imagination, you could come up with all kinds of interesting uses or situations where Opendime is just what you would want....

My explanation might not be very good.  Ask nvK, or order a three-pack and see for yourself.

Okay, thanks for explanation. In general I got how it works, it is like those gold physical Bitcoins with the difference being that you can "preload" them with an arbitrary amount of bitcoins. In any case, they are not suitable for a trade in an offline mode when the parties don't trust each other, can't check if the funds are really there as well as check if that address really belongs to the wallet on the device (i.e. it actually has the private key of that address inside). In this way, it still requires the blockchain and access to a computer. But then you could just transfer the money from one online wallet to another without using such a device (which you can lose or break with the coins lost forever)...

The use case is probably to give bitcoins to someone who doesn't yet have an online wallet

It's one of those things that is hard to pigeonhole. People use differently, but a good example is that it can be passed along multiple times. So you'd get n transactions offchain. 

Get a package and play around, because it's a whole new thing. It's much more interesting to play and figure out what you can do with it than try to explain :)

I got it. But how can we check that the private key on this gadget really belongs to the address the balance of which we can check on the blockchain without revealing it? In other words, is it possible to "authenticate" the wallet on the device without "compromising" it? If it is not possible to do without showing the private key, you can't accept it from someone without risking a double-spend or give it to someone else unless you give it "blindly", i.e. without knowing the private key and whether the wallet is authentic. Thereby, you can pass this wallet only once offchain, then you will have to use the blockchain again (at first to check and then to reset the stick)...

But the idea still seems to be viable (for small sums, at least) since it allows to transfer funds without confirmations (even if only once per "cycle")

There is a whole FAQ on authenticity and validation here https://opendime.com/#faq . It also ships with a few open source validation python scripts for advance users. But better yet, the Electrum plugin will be merged soon and you will be able to do "paranoid" check right from Electrum!

I read the FAQ on your page, and this part clearly states that Opendime units are expected to be used only once:


That means that you can't make n-transactions offchain as you at first stated. What did I miss?

You can deposit more and pass it along multiple times like a bearer bond if sealed. They can only be unsealed once.

Offchain means that the bitcoins are still in it, unspent in the blockchain.

I got that, but this is precisely the point I'm trying to clarify. Say, you are given a stick which allegedly has some bitcoins on it (you are told so). Okay, you know the address, and you can check on the blockchain how many bitcoins belong to this address, but you don't know the private key (until you unseal the device), thereby you don't know if the stick does actually contain the wallet with that address (and its private key)...

In this way you are required to break the seal to make sure it is authentic (i.e. get the private key), but after that the device is no longer usable

Opendime will sign a message using it's private key; can be verified with any wallet

That means that the key is internally readable without unsealing the device, and as such can be read by whoever gets access to it, right? So it would be possible to extract the private key (maybe programmatically) and then try to double spend the coins loaded in the wallet...

Take it as a warning, if your device takes off in serious, someone will hack it eventually

Similar to Trezor or Ledger, to remove the private key you'd need to spend a few hundred thousand dollars to peel open the micro and read with an electron microscope. By it's nature, the private key for Opendime has to reside inside the device.

Yeah, but they are not intended to change hands, and (I hope) the private keys are encrypted with a passphrase in them (I don't really know). So even an electron microscope won't help a would-be hacker. If you add this feature (as an option), that would make the wallet by far more resistant to a possible hack, and no one will be able to grab your coins if you accidentally lose the stick. In any case, now I understand how the device works. If it can confirm the address with a signed message, you can rest assured that it has the right key and the address of the wallet is indeed authentic...

Thanks for sparing your time

Happy to answer questions :)

Fun mention on Bitcoin Uncensored Podcast!

https://soundcloud.com/bitcoinuncensored/e45-midget-drug-dealers-081516 (min 38:40)

...

Update on my use of OPENDIME hardware

I bought six of them, tried one out to learn the device within a day or so of arrival.  The instructions and device lay-out were "good enough" for me to load the device with random input, later to "load" the wallet with BTC.  Later, I broke the small stick (in center with lock logo) to get the private key, and had the small amount of BTC there swept to my blockchain.info wallet.  (More detail upthread, this was a summary).

*   *   *

I have since gone on to load up two more with somewhat larger amounts of BTC with the idea of keeping them as "cold storage" devices (not really recommended by nvK, but they're my devices now, smile).  The OPENDIMEs are now ready to be issued as "payment" or as a gift (two of the uses foreseen by their website).  YES, there is no way to securely backup the Private Key (it's hidden in my unbroken devices), but they are securely locked away, as one would lock up gold or CA$H.

One nice thing about them is that I will never have to "update firmware", as I have had to do with both Ledger and Trezor.  In both cases I was nervous during the update process...  But, I was forced to do so with the Trezor, else it would not work (not even open to see amount).

...

Actually, another question just occurred to me, nvK.

Based on what I read at your website (FAQs), it looks like the OPENDIME does not need to be in any communication with your website (no communication via the Web implies greater security for us users).  Doing the deeper security checks is beyond my capability.

Is that correct (no communication of the device with opendime)?

Perhaps readers of this thread may be interested to know that it looks like both Trezor and Ledger both require connection to their sites (not sure, but I believe that is the case).

No firmware updates and no connections back to opendime.com are big positives in my book.

Is it like a paper wallet where anybody that has your private keys can spend it?

If the opendime gets stolen, the thief can spend the coins?

Yes, he can. That's why I proposed to use a passphrase (as an option) to encrypt the private key. If this option is implemented, and you make use of it (i.e. encrypt the key), you would have to pass the thingie with a passphrase, for example, written on paper. Yes, that would make using opendimes a bit cumbersome, but in this case there will be less incentive for thieves to steal them. In case you lose one, you won't be as much frustrated (since no one will be able to appropriate your coins)...

And the one who finds it will feel like returning it to you for a reward (you could stick your address to it)

...

Interesting proposal, deisik, re a password to protect Opendime.

*   *   *

But, my question for nvK today would be how an Opendime's balance could be accessed if all wallets in the future become HD wallets.

My (poor) understanding is that HD wallets do not permit importing Private Keys.  This may be a problem if there is no way in the future to "sweep" balance from an Opendime to and HD wallet.


How do we move BTC "from" an Opendime to an HD wallet (for that matter, to a Ledge Nano or a Trezor) or other wallets in the future?

This is Perfect!!! is it open source? also do you know the precise deimentions please?  How many do you have? I would be interested in 50 but need precise deimentions 1st please :)

Also lets say you put in 10 BTC and it gets lost... there is no back up or way to redeam it right? what if it malfunctions or something. Hmm its interesting but with out a back up I would be pretty worried. But with a back up its pointless. Hmm this is really interesting idea but there must be something as a fail safe. IE. removable memory or something. Is there anything?

The only safe back-up of sorts that I can come up with is to split your bitcoins between two sticks. On the other hand, this increases the cumulative risk of one device malfunctioning two times, wtf...

So it still seems to be six of one and half a dozen of the other

Yeah... It would be good enough for me if there was a tamper proof piece of memory that contained the private key or something. Personally I would feel very not safe putting 10 bitcoin on here. Although its a great concept just this slight bad feeling I got about it.

Damn its just Almost perfect :) Im still gonna buy some.

maybe they come in a pair of 2 with the same address... You can use either to withdraw the bitcoin...

That would work. It  would double the price per transaction but it would be safer and work. So if you ever accept one you have to take 2.

As the rep has said, opendimes are not intended for keeping coins. Their primary purpose is to give (sell or gift) bitcoins to a person without making an actual transaction on the blockchain...

So if you don't trust these devices with 10 bitcoins (I wouldn't either), use the plain old blockchain

How would you know that exactly this batch of opendimes is not supplied as triples, to provide for an even better reliability? And you would actually need to take all three of them to avoid a double-spend...

Or would it be a triple-spend already?

lol I know.. I think something like this is a great idea though. I make physical cryptos like Casascius and was always wanting something like this. I suppose for a 1st attempt its awesome. I certainly would put a shrine up in my living room and worship someone who has made this. I just wouldnt use it really I would only keep it as something cool to have.

Yeah, I was rather skeptical myself about these devices at first, but if they polish this technology of transactionless money transfer in the future and make it as cheap as dirt and as reliable as a Swiss watch (and recyclable at that), then it might get traction as well as widespread recognition and popularity after all...

For example, between retail merchants and suppliers

Cool video by NODE https://www.youtube.com/watch?v=ypQHc3EQVfE

"OpenDime: Real Life Cyberpunk Cred Sticks"

I would like to purchase an open dime from the first batch. Please pm me if you have an unused first batch unit that you would be willing to parti with. I am willing to pay shipping and a modest premium.

Sorry, nothing left.

Oh I know. I'm hoping one of the previous purchasers will resell to me.

*edit* By the way. Your project is AWESOME.

Pre-Black Friday OPENDIME Deal Started!!



Ann: https://twitter.com/opendime/status/801156846786584576

Shop: https://opendime.com/#preblackfriday

https://pbs.twimg.com/media/Cx5H557VIAATrKV.jpg
 (https://opendime.com/#preblackfriday)

New Telegram group for Opendime https://telegram.me/opendime

Also, don't miss today's Opendime BlackFriday Sales! https://opendime.com/#blackfriday

Neat, 3D print your own Opendime case http://www.thingiverse.com/thing:1934145

http://thingiverse-production-new.s3.amazonaws.com/renders/75/9d/63/c9/f5/d843ef6f9fa00fe447fd7e7d725d817e_preview_featured.jpg

Well scored Opendime unboxing lol

https://www.youtube.com/watch?v=OaYUzxEOAvQ

Cool device! Have thought to get some in time for Xmas, but I was waaay too late.

Here's an idea: how about adding a BIP 122 blockchain: link in a addition to the predefined Block Explorers to check the balance?
See BIP 122 for details: https://github.com/bitcoin/bips/blob/master/bip-0122.mediawiki

Thanks!

We are looking into it, if we can make it  happen, it will be on the next version.

Brilliant! Thanks.

So is there going to be some sort of boxing day sale just like what you got for black friday?
Might be interested in getting one of these then if can be had for some bits off. ;D

ULTRA SECURE: The private key is generated inside the device, and is never known to any human, not even you!

So what happens when you "Damage" the device? and do not have the key?

Funds lost forever??

How Is the device protected?

Is the source code (open source) or has the code been reviewed by anyone?

Looks a interesting product but not knowing the private key.. That could become problematic.

I noticed you said that a hacker would have to spent $100's to do any digging into the device. In the world of cybercrime we live in these days there are many reversing / hacking groups out there. a few 100 $ is not a lot to work out how to hack a hardware bitcoin wallet. You must always think there is someone smarter with a bigger budget round the corner reversing your work.

- 100's of thousands to digg into a single device
 
a good video here https://www.youtube.com/watch?v=ypQHc3EQVfE and FAQ here https://opendime.com/faq

Very interesting technology!

Any idea when the next lot will be available?  Would love to have a dig into this!

The next batch is planned for late February, but we are taking pre-orders :)

Announcing: OPENDIME v2 – Now *Genuine Verified* Bitcoin Credit Stick

http://blog.opendime.com/post/155026798632/announcing-opendime-v2-now-genuine-verified

http://68.media.tumblr.com/765def5ab8c5ea2432faecc07dde396a/tumblr_oius0wbLt11uo3k2so1_540.png (http://blog.opendime.com/post/155026798632/announcing-opendime-v2-now-genuine-verified)

Jon Matonis compare these to bearer bonds with plausible deniability. I agree

...

The new version 2 looks very nice, I will order some in due course.  It really looks great!

But, I have an observation: Opendime is already more than half way there to being a hardware wallet.  Yes, I understand the "bearer bond" nature of the Opendime, but perhaps the time should come soon for an Opendime Hardware Wallet.  I like the idea very much of simplicity and a cheap device.

The only issue I have with the devices (and I have some Opendimes) is that once you get the Private Key by breaking the seal, you have to import the keys into another real wallet, and apparently some wallets (HD?) will not allow importing Private Keys...  Am I wrong on this? 

Perhaps a +/- $20 Opendime Wallet that is is simple and cheap would be a great seller.  Even if the device would only be used once or just a few times, a real wallet would likely be of interest to me.

Question:

Once the hole is popped , It can still be used as a wallet  , funding and withdrawing multi times at will ...??  correct...

I wonder if NFC could be incorporated into these in the future....

Electrum and Copay have no issues sweeping the private key from an Opendime.


Technically yes. If you deposit again, it's just a private key you control. You can re-sweep it.

Hello.

Here is the Release Candidate for Opendime v2 and a White-paper draft.

https://github.com/opendime/opendime/tree/master/v2

Feedback welcomed!

Thanks

when do these ship?

We are planing to start shipping units mid march.

All shipped.

V2 now in Stock!

The part that scares me: If I plan to use it as a long term storage equipment, how I can be sure that the NAND flash will store the private key without loosing it as it could happen with a standard usb drive left in the drawer for a long time?

You can always unseal it and backup the private key.

I can also generate an offline seed and backup it on a uncompromised machine...

The point is: opendime, wonderful idea, but what about the long term security without exposing the private key?

I would never accept an opendime as a payment, cause is basically a deteriorable asset

You can't have both. It's either a never exposed private key or it has a backup.

Let me explain with a decent example. I don't know if you have already heard of the Ledger Nano. Basically in the setup process, the nano output once the seed to your computer (that is supposed to run a live distro), so you can have peace of mind even in the case that the nano is destroyed.

I know that the opendime is supposed to be a security token that you can pass to other users and cannot have this function, but the insecurity caused of random (and systematical in large production batches) malfunction is really a deal breaker to me.

However I wouldn't hide that the idea of testing one of them is really appealing, i like the concept!

We have recently discussed this matter in depth

What you are telling is the same when you have a backup. In that case the whole idea of whatever device you are using is losing its major aim (i.e. keeping your coins safe). It could be argued that it is still better than, say, a web wallet, but your coins are still not 100% safe. On the other hand, Opendimes are exactly that, if it breaks you lose the coins, so no way back. But these devices are in fact not assumed to be used for long-term storage, to begin with. They are there to enable off-chain, hand-to-hand transactions when you want to buy something but don't want to leave a footprint on the blockchain. In other words, you put your coins there and then give this piece to someone who can do with the coins whatever he wants

Yes, they are cool! (Honestly if there was a discount or something like a coupon to have them for a lower price, I'd buy a couple to do an audit on the durability in tough conditions)

My point is: the trade-off on leaving a blockchain footprint vs single point of failure is worth enough for real use cases?

First use case:

- WOW, with opendime i CAN actually do microtransactions!!! I load them once and I can have peace of mind about not being harassed by slow blockchain and costly fees!
- Ahh crap, I'm handing out a 15 bucks device for my coffee transaction, definitely not worth it :/

Second use case:

- Opendime is super nice, finally I don't have to wait confirmations when I'll buy my private yacht
- Craaaap, I have plugged in multiple times my opendime and It's definitely dead!!! How can I recover my 50 BTC loss :/

IMHO; Yes, it's worth it. Hard to put a price on real privacy/fungibility.

You can equate it to carrying a large pile of cash/gold for an in-person exchange. There is always risk.

There is certainly a third use case

Basically, when the average transaction fee rises above the price of one OpenDime device (or comes pretty close to it). This thread has been inactive for some time, but now when the fees are skyrocketing together with the Bitcoin price, it is active again, and this is not a mere coincidence. It could eventually make sense to buy a dozen OpenDime devices to pay for your yacht in a more or less safe way, without someone closely following your online transactions which you would have to make otherwise, and without risking much in case of a device failure

Damn dude this is an apocalyptic scenery! One should keep his stack separated in different devices to be sure that at least a part of them should run properly. As I stated before I like the concept but maybe they are a little expensive in the actual situation.

I think alexrossi's criticism come from not fully understanding how it works or never handled one in hand.

alexrossi if you ever actually try one, you will probably change your mind.

Well what I know is that with electronic devices there is always a percentage of dead on arrival devices and instable devices that will die a little later. You know, private key on an unlucky opendime could be worth thousands and totally lost, without possibility of recovery.

Yes, I haven't tried one yet, that's true. In my opinion the seller should give the opportunity to buy just one, to take confidence with these devices and eventually do a bigger step after by buying many others.

We test the hell out of this devices and discard the factory DOAs, then we program them and re-test them.
Is it possible someone breaks theirs? Yes.
But I deal in facts not hypotheticals; This is the 3rd batch of devices, thousands sold and 0 returned this far.

Well, this is good to hear. May I ask if it's possible to have a discount in case of group buys? Many users in Italy could be interested in a device like (me too)

Just gather a few folks and place an order :)

And that's the whole point of these devices

There is no way back once you give away your Opendime or it gives away you! It is not like those hardware wallets when you can restore your key even if they break (or someone else could do without ever physically touching your wallet), which, as to me, undermines the whole idea behind them (i.e. storing your coins safely). If you need safety just use a paper wallet instead. Though I agree with you that you can't be sure that such a device doesn't malfunction, I think you could discard erratic devices by test using them for some time (i.e. without actually writing the key to a specific unit). In any case, these device are expendables and you shouldn't in the first place be using them for storage (again, use a paper wallet if you need that)

nvK, as stated before I'm truly looking forward to setup a small group buy (24 pieces) of opendimes here in italy. Just a couple of questions that i post here because they can be useful also to other people:
1) Italy is considered as western europe or eastern europe?
2) Tracked shipping is just a registered mail from canada with the local post office or is done with a shipping carrier?
3) If the question #2 is registered mail, is there the possibility to use a faster shipping carrier like DHL or UPS?

NP.

1. Western Europe
2. Canada post, "business light package" registered (Aside from customs delay, it usually takes 5-10 days to Italy)
3. Yes for orders over 99 (33x 3 packs)

Folks, we've made a Experimental Google Chrome App.
It only works in Chrome Dev mode of Chrome OS.

Installation instructions here: http://blog.opendime.com/opendime-chrome-extension/

http://blog.opendime.com/images/posts-img/chrome-extension-big.png

Looking good nvK! Guess I'll have to get a few second batch ones as well. ;D

It's in stock! :)

Hi,

I was thinking of giving an opendime to each of my university teachers to introduce them with bitcoin and load some money into it. I have a question, what is the average lifetime of the hardware against dust and etc...

Thanks, let me know

Is it a subtle way of bribing them?

Are you afraid that they won't be able to spend their satoshi and will punish you? Regarding your question specifically, I guess the same rules apply here as to usual memory sticks. Dust is not very dangerous to them, unlike high and low temperatures as well as fast transitions between such temperatures. Apart from that, these devices should be considered as expendables anyway as has been explained in the thread, i.e. they should not be used for long term storage

New N.O.D.E video of Opendime V2 https://www.youtube.com/watch?v=1LrKLsZYGjQ


https://i.imgur.com/aK10GMe.png
 (https://www.youtube.com/watch?v=1LrKLsZYGjQ)

Some user performed stress tests to Opendime.

Freeze, Bake  and Washer Tumbling.

https://twitter.com/bois_i/status/876081639759261696 https://pbs.twimg.com/media/DCh3mWHW0AAdNed.jpg

https://twitter.com/bois_i/status/876129830827425792 https://pbs.twimg.com/media/DCijbeCW0AErEW2.jpg https://pbs.twimg.com/media/DCijbd_XkAAPVQh.jpg

https://twitter.com/bois_i/status/876701904830595072 https://pbs.twimg.com/media/DCqruoLXoAE_OfZ.jpg

So, you are creating a coin and a blockchain where only the software itself has the private keys, assuming that the devs have not given themselves access.  It is one thing when an online wallet or exchange gets stupid about controlling the keys to your wallets, but what you are talking about is zero control, zero failure fallback and an outright Skynet wallet that will not take over the world, just simply not give you any control.

Decentralized means just that, the users, the wallets and the people have the control, not a USB stick. I do not see anything wrong with that setup. If used carefully, i think it is worth it.

Isn't that exactly how Bitcoin network itself operates?

In fact, if you made this post in some other thread (discussing Bitcoin in general), I would have thought that you are asking not about a certain device like OpenDime but about Bitcoin and decentralized currencies as such. With Bitcoin it is exactly like that, no single individual or group of individuals is given or has taken complete control over the coin, so it could be loosely claimed that software itself is having all the control. Though I don't know if it has anything to do with SkyNet

I'm sorry posternat, but what are you talking about? This is not some kind of Altcoin project nor is a new coin or blockchain being created. This is a Bitcoin Hardware "Wallet" that generates a private key when it's inserted for first time into a computer, which means that the creators do not have access to it as it's generated on your computer. Yes, if you lose your OPENDIME, you lose your Bitcoins, so just keep it in a safe place.

I came across this and I must say, It definitely looks interesting. I have some concerns though:

1. If the USB stops working? I will lose everything or there is a way to recover?
2. Is it possible to sign addresses directly (without importing the private keys somewhere else)? If yes, the wallet must be sealed or not?
3. If unsealed, the private keys become directly visible on the first page or a button must be clicked?
4. I kinda know the answer, but just to confirm, If OpenDime goes down or something, I'm good since everything is on the device, right?

Even though I didn't get answers for my questions, I ordered the product anyway with hesitation.

---

The support was online I believe because I got an instance answer. I asked them for a refund and they told me It just got picked up and I was provided by a tracking number (I'm not sure what are the chances that the product actually got shipped when I asked for a refund). I checked easypost with the tracking code I was given, the results are "Unknown" and "No Estimated Delivery Date" since I ordered the product. I asked the support and they said It should get updated in a few hours, It's being three days and nothing yet.

I'm not really accusing anyone of anything but is possible that the item didn't even get shipped yet and I have been given a fake tracking number just because I asked for a refund? I have no doubts that I will eventually get the product as OpenDime and Coinkite are reputable companies but If the item didn't get shipped, I'd prefer a refund instead of waiting more.

You will lose everything, no way to recover


Correct. You own a sealed Bitcoin private key

It is a great idea that people transfer private key instead of transfer bitcoin.
But
For a throwaway wallet, it is just too expensive. The wallet it self would take a great part of the value it transfered.

Have you consideing of replace the chip with much cheap ones.
I think atmegaA8 or similar MCU can do the private and public key generation jobs quite well.
And the cost of final product might be reduce to about 1-2 dollars.

Yes, the idea is great, now the project need to be much cheaper and have more marketing. I consider buying, except that there is no option to do that currently :( As I would love to make a video about it...  I will wait as there is no-one reselling it in my country.

How many weeks to the second batch?

It is still a pretty useful product even in its current state. Just not as a cred stick style cash substitute for face to face transactions (which makes a lot of sense as a goal). But its still a good way to store your bitcoin offline or give them as a gift or sell bitcoin in bulk at a shop.

I like to see the new LTC versions are added. Maybe more cryptos will be added ?! :)

We have units in stock again :)

v3 ?

In the title of your latest post.

If this is a new unit, please let us know!  Also, how it might be different than v2.

V3 is here, check out the blog post http://blog.opendime.com/opendime-v3-announcement/

What’s new in V3?
This change is a hardware bump, with minor firmware changes:

Improve the Japanese language text (thanks to Vis Virial for the pull request)
New batch certificate (#2) for first build of version 3.0 hardware.
Look for version “2.2.0” in the firware with checksum: 753ec10262f92c6bbe4f9a01e440278c36c2c8352ed897a75aabb0993d63ab9a and complete version string: 2.2.0.20170721.115213
The real news is on the hardware side, where we made a number of changes to improve reliability and manufacturability:

The device is now 47mm long, up from 40mm. The extra length solves an issue we saw with some USB ports that didn’t allow proper and complete insertion.

Protective plastic is now applied into a narrowed section of the board, which better secures it, makes the product look more “finished”, and generally should improve the quality and appearance of the product.

We moved the “unseal” hole a little further under the plastic, just in case.

The edge of the board will be more smooth with less rough spots due to changes to how we make the PCB.

Board is marked in gold with “v3.0” and “r.A” (for revision A).

I have an opendime that is not seen by any PC at all, (as in the USB port does not even notice that it's there).
I'm assuming the answer is no but, is there is a way to recover the funds?
Thanks,
Dave

If it works like a read only usb stick then you could take it to somewhere that deals with data recovery from usb? Is it’s not recognised it might be the controller that’s broken or just a loose connection which can be fixed.

You have tried other pcs etc?

I guess it all depends on the value of the balance in the stick?

Contact support support@opendime.com

I currently have 3 Opendime v3 sticks. They are pretty cool.

Hi, I made a topic explaining how the opendime works in the Portuguese section of the forum. I did not find any other Portuguese topic explaining it. Do you know if any already existed?

Opendime Portuguese (https://bitcointalk.org/index.php?topic=4010218.new#new)

Btw, Do you think it's safe to participate in a contest like this one (https://bitcointalk.org/index.php?topic=3444625.msg37619078#msg37619078), where they distribute opendimes?


Thank you.