Just like the title says. 10BTC or nearest offer. Buy from a trusted source! Free express shipping worldwide.

Just like the title says. Five brass halfs, straight off the roll. No cases, ungraded, never touched with bare hands.

Auction ends exactly 7 days from the time you see up there ^

Just like the title says: the empty roll that my 1BTC Casascius coins came in. I have no use for it, maybe someone else will appreciate it.

As you can see from the stickers, this is roll 1Ag1-C: the third roll from the first batch of 2013 Silvers.



Entertaining all offers! Includes the plastic case and the little foam discs that padded the ends of the roll.

[THE ONLY VALID PAYMENT ADDRESS: 15KfDo1Tg7DGNjHaxGBuQuR3zjhnWVh5Q2]

Just like the topic says!



The only payment method is BTC.

The cost is the BTC equivalent of $30 to USA/Canada or $35 worldwide, using the winkdex (!) rate at the time you place your order.

Shipping is included in the price, and will commence the week of September 28.

First 12 customers only.

Sizes available: S-XXL (XXL $2 extra)

Anvil 100% Organic Cotton tees, nice fit.

THE ONLY VALID PAYMENT ADDRESS: 15KfDo1Tg7DGNjHaxGBuQuR3zjhnWVh5Q2

Hey folks!

I've got ten (10) 2013 Casascius 0.5 BTC Brass physical bitcoins for sale. No cases, second owner, fresh off a full roll, never touched by bare hands, etc. See my other threads for pictures; they look like coins  

I'd like to sell these ten (10!) coins in a single lot, for 7 BTC. Free tracked worldwide shipping is included, of course.

Pull up your socks and dig out your wallets, buy some coins and get yourself a free prize included in your package!

How could you resist?

Ten (10) 2013 Casascius 0.5 BTC Brass physical bitcoins. Purchased from original owner CanaryInTheMine, evidence here. In my possession ever since.

Ungraded, unslabbed. 8 BTC, firm; so firm that this thread is locked already! PM for details.

Subject says it all. I used to like browsing this sub, now it's unusable.

Looking for people to help with a postering campaign that will be focusing on large cities. Location does not matter, population does!

Your job is to securely adhere Bitcoin-themed posters to poles and other cool spots, and send me pictures of your work. You will be compensated for the cost of printing the posters, and for your time spent affixing them in fun, conspicuous locations.

Bonus points for interesting locations and places that uniquely identify your location (Eiffel Tower in background, etc).

Pictures of the design can be found here: https://bitcointalk.org/index.php?topic=756955.msg8618397#msg8618397

[THE LEAD-UP:]

THE LEAD-UP:
Most of you know me from dealing with Casascius coins, but some of you may know that I also run a silkscreen printing business. I've recently been commissioned by a client to design and print a "What is Bitcoin?" poster, and we've decided to produce some extra copies for sale to the general public.

THE POSTER:
5-color silkscreen print on 18x24" white Cougar acid-free art paper.
Limited edition of 100, with 50 being reserved for the original client's use. The remaining 50 are for sale to the general public.

THE TIMELINE:
Posters are being silkscreened this week, with the preparatory work already started. It's estimated that the print run will be complete by Friday, August 29.

THE PRICE:
Pre-order pricing is over! The price for this poster is $45, plus shipping to your part of the world. Shipping is estimated at around $20 for North America and western Europe.
The only payment address is 1CiVT9uRrfdqupH1exx5jtPAS9NHPATLqi. If someone tells you to send to another address, it is a scam.

THE CATCH:
I've produced digitally-printed proofs of the poster design, but I'm not sharing photographs until the actual print run is completed, because a digital proof and a real silkscreen print are so very different that one would not serve as a fair substitute for the other. I'll reveal detailed photographs of the actual silkscreened posters once the print run is complete, but PRE-ORDERS WILL BE PURCHASING THIS POSTER BLIND.
Pictures here: https://bitcointalk.org/index.php?topic=756955.40

HOW DO WE KNOW THIS ISN'T A SCAM?
Good question! You should check my trust ratings here on the forum, as well as my OTC Web of Trust ratings.

HOW DO WE KNOW THE POSTER ISN'T GOING TO SUCK?
It's the best Bitcoin poster. You're going to love it. Not sure? Just wait for the pictures! The discounted early-bird price is a thanks for going out on a limb, but any remaining posters that haven't been claimed by Friday at noon will be available for sale, with lots of pretty pictures so you know exactly what you're going to get.
By checking out pictures here: https://bitcointalk.org/index.php?topic=756955.40

WHERE DO THE PROFITS GO?
The lion's share of the profits will go towards an international postering campaign, where we pay a network of postering crews to produce digital prints of the design and post them in cities all over the world as a public service to the Bitcoin community.

THE COUNT:
As of right now, ALL 50 posters have been sold, 0 remain. THANKS, EVERYONE!

I'm always on the lookout for Casascius coins, but it's hard finding coins with a verifiable (via PGP) chain of custody.

Do you have Casascius coins for sale? Were you the original recipient? You can ask Casascius to provide you with PGP-signed documents stating that you are the original owner of the coins. These documents can be the basis of a chain of custody that tracks the owners of a given coin, providing evidence of the coin's legitimacy.

Not the original recipient, but still have PGP custody docs? This is okay too!

No PGP docs and not willing or unable to get them? This isn't the thread for you

No idea what I'm talking about? Start reading here: https://bitcointalk.org/index.php?topic=268965.msg4627318#msg4627318

Please post pictures and asking prices below!

[(1)]

I've got some Casascius coins that I'd like to sell.

(1) 2011 1 BTC Brass series-1 hologram - 4 BTC
(1) 2011 1 BTC Brass series-2 hologram (MS-64, mintage of approx. 500) - 4 BTC
(1) 2013 1 BTC Silver series-3 hologram (from the third roll ever produced: Roll 1Ag1-C) - 3 BTC
(19) (16) (11) 2013 0.5 BTC Brass series-2 hologram - 1 BTC


Silvers come in air-tite cases. Shipping from Canada with very discreet packaging.

PGP-verifiable chain of custody (from Casascius, through me, to you) is included with all silver coins, free of charge. Not sure what this means? Read here:

Nubbins, how did you extend the chain of custody on your coin?

Easy peasy. I take Mike's signed document, append text after his signature that identifies the new buyer, and sign the whole thing with my key.

For sake of illustration, Mike's original document is in blue, and mine is in red.

---Begin PGP doc---
- ---Begin PGP doc---

I, Mike Caldwell, sent coins a,b,c to nubbins,
and his PGP fingerprint is ABCD EFGH.

See attached document scanned-coins.pdf
with MD5 checksum blahblah

- ---Begin PGP sig---
234C%#@4fv524 <---PGP signature for Mike's key
- ---End PGP sig---

I, nubbins, sent coin b to zipmaster,
and his PGP fingerprint is IJKL MNOP.

---Begin PGP sig---
@%$Y#H/Rgef4e <---PGP signature for my key (ABCD EFGH)
---End PGP sig---

Then I just take this block of text and scanned-coins.pdf and send them along to the new owner.

Silver 1 BTC coins are from the very first batch: Series-3 holograms with the 1Ag1 prefix. I choose not to have my coins graded, so as not to break the chain of custody (the coins have never left my possession), but a previous buyer has graded a coin he received from me and it was given an MS67 rating. Here is a photo I took of two of my coins:


And here's a photo of the left coin, graded and slabbed:


Brass 1 BTC coin with Series-1 hologram contains a spelling error in the word "Casascius", light patina from handling and a few minor marks on the holo:



Check out my forum trust here...

And my OTC Web of Trust ratings here.

Thanks for looking!

Just like the subject says! I'm looking to buy one, maybe two, of these. Interested sellers, please list your price.

[1]

I've got some Casascius coins that I'd like to sell.

(10 7 3 1) 2013 1 BTC Silver series-3 hologram (1Ag1) - 2.75 BTC
(1) 2013 1 BTC Silver+Gold series-3 hologram - 2.25 BTC
(20 19) 2013 0.5 BTC Brass series-2 hologram - 0.9 BTC
( 4 3  2) 2013 0.5 BTC Silver series-2 hologram (only 45 made) - 7.5 BTC
(2) 2013 1 BTC Brass series-3 hologram - 1.5 BTC
(1) 2011 1 BTC Brass series-1 hologram - 4.5 BTC

Prices are negotiable if you purchase more than one coin! The silver coins come in air-tite cases; the brass coins will be wrapped in 100% cotton acid-free art paper.

Shipping from Canada. I've sold coins on the forums here before, and my packaging is very secure and discreet. All customs forms list contents as "collectible token" with a stated value / insurance coverage of your choice.

[Only 45 of these coins exist]

I'm selling a super rare Casascius coin: A Series-2 0.5 BTC Silver.

While there are many 0.5 BTC silver coins in existence, almost all of them feature the Series 3 hologram. This coin is unique in that it features a Series 2 hologram. Only 45 of these coins exist, which I believe is the lowest mintage of any coin/sticker combo aside from the 500+ BTC coins.

This coin comes with a PGP-signed chain of custody: I'll provide the buyer with a PGP-signed document from Mike Caldwell stating that I'm the original owner of the coin, and I'll also provide my own PGP-signed document, using the same fingerprint, stating that I've transferred ownership of the coin from me to you. I'll add your PGP fingerprint to my message, in case you'd like to sell this coin later on. Years from now, a chain of custody will be crucial in discerning real coins from fakes; this is a great opportunity to cover your bases.

Pictures of the coin can be provided to serious buyers. The coin is currently in an airtite case in a safety deposit box.

Asking price 10 BTC.

[grilled cat identity USB mining machine!!!]

grilled cat identity USB mining machine!!!

Well blame Google Translate, obviously it is not perfect.

This is the THIRD group buy for these shirts; check out the first successful group buy (29 shirts!) here: https://bitcointalk.org/index.php?topic=230843.0 and the second one (18 shirts!) here: https://bitcointalk.org/index.php?topic=246518.0

For all you AM fans out there, here's a professionally-silkscreened tee for you to wear! This shirt features a single-color white print on a 100% cotton t-shirt of a random color! Mens sizes are available, from S to XL; ladies junior fit (you've been warned!) are available in some sizes only, so you'd better ask.

Shirt colors available include black, sky blue, olive green, brown, and whatever else we have on-hand!
Roll the dice and see what color you get!



Cost:
The cost per shirt is $12 plus shipping.

In previous group buys, shirts were $15 with a promise to return $5 to all buyers if we reached a certain number of orders; rather than deal with the organizational mess of such a setup again, I've decided to offer a flat-rate price for all shirts.

I'll start printing and mailing orders when we reach 13 shirts, or on November 1 if we don't reach 13 shirts.

Shipping:
Shipping to Canada: $4
Shipping to USA/Int'l: $10
Please add $3 extra shipping for each additional shirt.

At today's prices:
Total for 1 shirt including shipping is in Canada and to USA/International.
Total for 2 shirts including shipping is in Canada and to USA/International.
Total for 3 shirts including shipping is in Canada and to USA/International.

How to order:
1) Calculate your total cost, with shipping included, and send the equivalent BTC amount to 1CXK1j9sk3xz48svhtWzcTkLzjvk7NwPFs.
2) Post your size (S, M, L, XL), and transaction id to this thread.
2) PM me your mailing address.

Final total: 3 shirts

Orders:
nubbins; 1 Mens XL; BTC0.077 (local); TXID:---------------; PICKED UP
pankkake; 1 Mens M; BTC0.106 (intl); TXID: 6408a6d56ba3775d279d178dad59d873e33e5556fdeadfde77dfd888d651aa58; ADDRESS RECEIVED
hlynur; 1 Mens L; BTC0.104; TXID: 826844a11fcfff267dbe03deb0f61f1475d9a357786ac6469ff402d534297283; ADDRESS RECEIVED

[-Lowball bids will be ignored (seriously, don't waste your time)]

Thanks to Tafelpoot; as we're essentially auctioning the same thing, I liberally borrowed from his earlier post.

I'd like to sell my 3 shares in the groupbuy by SilentSonicBoom here: https://bitcointalk.org/index.php?topic=225851.0

Each share represents 1/80 output of a KnC Jupiter miner for 2 years; hosting costs are covered by SilentSonicBoom.

This miner is extremely early in the queue, order number between 200 - 250.

I have 3 shares = 3.75% of the Jupiter miner output.

Bidding starts at 3 BTC for the 3 shares.
Action stops at high noon UTC on October 13.

Rules of bidding:
- The auction starts now and will end on 2013-10-13 at 12:00:00 UTC. The end time will not be extended unless the winning bidder fails to pay.
- When the auction ends, contact me by PM with your email address and your BTC deposit address.
- You will be given 48 hours to pay, beginning from the moment I request payment. Once your payment clears, I will PM SilentSonicBoom to update the payout address for the 3 shares.
- If you fail to make payment within 48 hours, I reserve the right to either cancel the sale, or to extend your payment window.
- Prices must be stated in BTC.
- When you post a bid, the bids in your previous posts are considered to be automatically canceled.
- If two people bid at the same price, the person who bid first takes precedence.
- I reserve the right for asking some of newbie or other bidders to present evidence or pay deposit to prove his/her bid is sincere.
-Lowball bids will be ignored (seriously, don't waste your time)

In an attempt to keep all of the discussion in one place, this isn't an actual cross-post; it's a link to the original thread. I realized after posting that my chosen subforum might not have been the right one.

So, without further ado: why aren't we sweeping?

https://bitcointalk.org/index.php?topic=291904.0

[So why don't we start doing things in a way that makes sense? Why don't we make sweeping private keys the default way to conduct a face-to-face transaction?]

There's no doubt that Bitcoin is wonderfully convenient for online transactions; it's fast, easy, and convenient. However, physical transactions involving BTC have always been a bit messier: how do you physically send digital money to someone with whom you're interacting face-to-face?

There have been a few attempts to find solutions to this problem.

The most low-tech method has been the static QR code, on display near the point of sale: the purchaser simply scans the vendor's QR code, sends the funds, and the transaction is complete. Pretty straight-forward, but not without its problems: the vendor must manually check to ensure the funds have arrived; the funds from all transactions are being sent to the same address, which quickly becomes a disorganized mess for bookkeeping. Also, the purchaser must have a smartphone capable of sending BTC, which is not always the case (many people have issues with blockchain.info for iOS, for example).

Hardware wallets like the TREZOR offer security and convenience for the purchaser; private keys never leave the device, so unless you physically lose it, your funds are reasonably safe. However, they're inherently dangerous for the vendor, because they have to plug foreign USB devices into their POS all day. All it takes is one bogus device loaded with malware to permanently change a vendor's mind on accepting funds in this manner.

Paper wallets are another solution, but they're not convenient, nor are they particularly secure: the address QR and the private key QR are on the same piece of paper (or plastic, metal, etc), which means that your funds are at risk from the moment you reveal the private key to the moment you've either spent all the funds in the wallet, or someone else has spent them for you. The vendor doesn't particularly mind this method of payment, as he can immediately import and sweep the funds from the private key. However, unless the purchaser is spending the entire contents of the paper wallet, the issue turns into where the change should be sent -- you don't want it sent back to the address for which you've just revealed your private key.

So why don't we start doing things in a way that makes sense?

Why don't we make sweeping private keys the default way to conduct a face-to-face transaction?

Here's a few examples of how this would work:

Alice
Alice wants to go to a cafe for lunch. She knows that a coffee and a sandwich will cost 0.1 BTC. She creates a new wallet address, sends 0.1 BTC to it, and prints out the QR code for the private key. When she places her order, she hands the cashier her QR code. The cashier sweeps the funds from the key, and no change is necessary.

Bob
Bob wants to buy some new clothes at the mall. He is planning to visit several stores, and he doesn't know how much money he will spend at each store. He has a budget of 2 BTC for this shopping trip. Bob creates 10 new wallet addresses, sends 0.2 BTC to each, and prints a QR code for each private key. He then creates a "change" wallet address, and prints the QR for the public key only.

Bob visits his first store and purchases a pair of sunglasses for 0.15 BTC. He provides the cashier with a QR code for 0.2 BTC, which is swept; he then provides the QR code for his change address, to which the cashier sends his change, 0.05 BTC.

Bob then visits another shop, and selects a pair of pants that cost 0.45 BTC. He presents the cashier with three QR codes for 0.2 BTC each, and then presents the QR for his change address. The cashier sweeps 0.6 BTC from the three keys, and sends 0.15 BTC to the change address.

Cathy
Cathy also wants to go to the mall to buy a television, earrings, and some lunch. She isn't sure how much money the earrings and lunch will cost, and she doesn't want to send a large amount of her money to a change address back home. She creates one wallet address with 3 BTC that she will use to buy her television, and creates several extra wallet addresses for her smaller purchases: some loaded with 0.05 BTC and others loaded with 0.01 BTC. This way, she can let the cashier sweep the funds without having to send too much change back home.

Dave
Dave wants to purchase 3 BTC worth of gifts for his wife. He creates ten wallet addresses, and loads the first with 3 BTC. He then transfers the QR codes for both the public and private keys to a smartphone app that can display them at will. He makes his first purchase by presenting the QR code for the private key with 3 BTC; he presents the public key of his next address in order to receive his change. With each subsequent purchase, he presents the QR for the private key that currently holds the balance of the funds, the cashier sweeps the funds, and Dave receives his change to an address of his choosing. As long as he has created enough addresses to cover all of his purchases, he can continue doing this until all of his money is spent.

Such a smartphone app would be trivial to create; it needn't even be specific to Bitcoin. This is handy for iOS users, as Apple disallows Bitcoin wallet apps, but obviously cannot ban an app that only displays QR codes. Users could create QR codes using bitaddress.org or a tool of their choice; importing the codes to a phone is as easy as capturing each one with the phone's camera.

I'm sure there are many, many other usage scenarios beyond the four presented here; I'm also having a difficult time finding any drawbacks in this system. Discussion is welcome!

A reply of yours, quoted below, was deleted by the starter of a self-moderated topic. There are no rules of self-moderation, so this deletion cannot be appealed. Do not continue posting in this topic if the topic-starter has requested that you leave.

You can create a new topic if you are unsatisfied with this one. If the topic-starter is scamming, post about it in Scam Accusations.

"Bitcoin Megastore"

not accept bitcoins as payment.

Store is on-hold for now

Bump!

It sucks that self-moderated endless-bump topics like this get to take up real estate on page 1. This is spam, pure and simple.

As reported by Mike Caldwell (http://casascius.wordpress.com/2013/08/04/defcon-21-successful-compromise-of-the-hologram-reported/), the hologram on Casascius physical bitcoins was compromised a few days ago by security researchers at DefCon 21.

While I've seen many people react to this news with dismay that their coins have lost all resale value, I'd like to offer a differing opinion, in the hopes of getting a discussion going.

Let's use the 1oz / 1 BTC silver round as an example.

Currently, this coin can be bought directly from Casascius for BTC2.5. Since the face value is BTC1, one could make the assumption that the rest of the coin (the silver round itself, plus the intact hologram) has a nominal value of BTC1.5.

Redeeming the face value of the coin by removing the hologram would destroy the BTC1.5 nominal value of the coin, as collectors don't want to purchase coins that are no longer in mint condition. It's not hard to imagine that the removal of (or visible tampering with) the hologram would cause a steep decrease in the nominal value of the coin: say, from BTC1.5 to BTC0.5 (essentially, spot price of silver plus a premium for the scarcity of the rounds).

I can think of only three reasons for removal or tampering of the hologram:

(1) curiosity (some people want to know what it looks like underneath),
(2) honest redemption (some people may wish to spend the BTC contained within), and
(3) fraud (some people may wish to redeem the BTC and then resell the coin as if it were intact).

For the purposes of the argument, we're really only interested in (3). Situations (1) and (2) would result in a visibly tampered (most likely fully removed) hologram.

Situation (3) is a more interesting situation, in that it's impossible to know when purchasing a coin from a third party whether or not they possess the private key -- that is, until you check the balance and find that it's been transferred to another address.

Now, a coin which has been successfully tampered with (i.e. no evidence of tampering is present) still retains a nominal value of BTC1.5, even without the added BTC1 face value.

Given that the holograms will likely be given an upgrade in the near future, the value of existing coins as collectibles will likely increase; but by how much?

For numismatic purposes, a successful, no-evidence tamper would not result in any decrease in value from a non-tampered, unredeemed coin; or would it?

I'm much less worried about this situation than I originally was, but I'd still love to get the opinions of other people on the subject.

Thoughts?