ZEC Cabochons are up for purchase!

Twitter @CryptoCabochon

Introducing ZEC Cabochon, a Crypto x Art collaboration with artist J.N. Shinde and his Journey of life collection of paintings during the 1960s-80s in India.

The ZEC Cabochon is carefully assembled by engineering a 6061 aluminium alloy bar to hold an archival quality print of the painting behind a Plexiglas™ enclosure & a Zcash Sapling (zs…) private key inside an anodized plate that is locked for permanence. The back of the plate has the corresponding z-address public key engraved.

Each 7 ZEC unit is engraved with Zebra pattern and the Zcash genesis block text. Both 7 ZEC & 21 ZEC Cabochons are anointed with a SWAROVSKI™ 1088 & 1028 XIRIUS CHATON Crystal in white & black diamond, yellow, light rose and fuschia colors on the top; sparkling the light of cryptographic value contained inside with a spring-steel locking mechanism.

NOTE: The units are sold unloaded and do not contain any cryptocurrency. It is up to the buyer to send memo/value transactions to the artwork which is readable with the viewing key that is provided with each unit.

For your privacy (and to enable interesting applications) the viewing key is not engraved. You can fund the ZEC Cabochon using the engraved public key, but only those privy to the viewing key (or the secret key locked inside) can determine the Zcash value held by the artwork.

The 7 ZEC denominated Crypto Cabochon

Units in edition: 57

Painting of people gathering in meatspace;

A quiet place in the forest, I have named this Satoshi’s disciples.

On August 11, 2010 Satoshi was part of a bitcointalk.org discussion about adding privacy to Bitcoin.

Satoshi said “The challenge is, how do you prove that no other spends exist? It seems a node must know about all transactions to be able to verify that. If it only knows the hash of the in/out points, it can’t check the signatures to see if an outpoint has been spent before. Do you have any ideas on this?

It’s hard to think of how to apply zero-knowledge-proofs in this case.

We’re trying to prove the absence of something, which seems to require knowing about all and checking that the something isn’t included.

If a solution was found, a much better, easier, more convenient implementation of Bitcoin would be possible.”

Zcash was born on October 28, 2016 by implementing innovations from zk-SNARK proofs on top of Bitcoin and maintaining the same 21 million cap for a sound monetary policy.

The 21 ZEC denominated Crypto Cabochon is titled “Temple of Idolism”

Units in edition: 10

Look closely and you will see the details surrounding the wall with flowers in vase, petals, peacock feathers and chakras.

The art has depth in texture and a mystical magic about it!


How much does it cost?

The 21 ZEC marked CryptoCabochons are for sale for 21 ZEC each.
The 7 ZEC marked CryptoCabochons are for sale for 7 ZEC each.
Worldwide shipping & tracking (when possible) is included.

Q: Why is this not pre-funded?

Selling pre-funded art is problematic in the US (and Casascius was warned by FinCEN that it requires a money transmitter license).

NOTE: There are no plans to change the price of the 7 or 21 ZEC Cabochons even if the market value of ZEC fluctuates. The units are priced for final sale.

How many units will be made?

10# of 21 ZEC units & 57# of 7 ZEC units.
All units will be marked with serial numbers and sold on a first-come-first-serve basis.

Who is it for?

Art collectors, ZEC whales/hodlers, and curious individuals who want to experiment with a locked up paper wallet.

How do I place an order?

Please send your alias, mailing address & phone number via a shielded memo to zs1xm4mfqtgc3pewvlfzutr37707gtz8a4vmh27a85m3mgmrhtr0neugjz73e8uar4qj4ssjccwylf along with 7 ZEC or 21 ZEC for the specific units to order. You will receive confirmation for your order within 7 days or refund if the units are sold out. The availability of the ZEC Cabochons will be posted on the website. To obtain ZEC for making the purchase, see Zcash exchanges

e.g. If you want to place order for 2 units of 7 ZEC Cabochon, Send a memo “2 x 7 ZEC Cabochons for Markus Maximalus, 900 Boylston Ave, APT 101, Boston, MA 02115 USA +1 617 400 999” along with value of 14 ZEC to zs1xm4mfqtgc3pewvlfzutr37707gtz8a4vmh27a85m3mgmrhtr0neugjz73e8uar4qj4ssjccwylf

e.g. If you want to place order for 1 unit of 7 ZEC & 1 unit of 21 ZEC(and ask artist to purge viewing key), Send a memo “1 x 7 ZEC (keep viewing key), 1 x 21 ZEC Cabochon (purge viewing key) for Akiara Ube, 9392-1146, Akasaka Akasakabizutawa(18-kai), Minato-ku, Tokyo, 107-6318 JAPAN +81 9038402790” along with value of 28 ZEC to zs1xm4mfqtgc3pewvlfzutr37707gtz8a4vmh27a85m3mgmrhtr0neugjz73e8uar4qj4ssjccwylf

Additionally, you can pay via your coinbase account or via USDC, DAI & BCH on www.cryptocabochon.com

How do I use it?

Each unit comes with a shielded public key engraved on the back of the unit and a viewing key on a paper.
You can send Zcash(equal to the marking of 7 or 21 ZEC) to the shielded address and verify the funds have been received by the address by checking the viewing key.
You could also use the CryptoCabochon as a memo note diary and keep sending messages to it over time, to pass it to your next generations!
Zcash light client such as Zecwallet Lite (zecwallet.co) to import the viewing key
You could treat it as a collectible art and put it in your showcase or lock it up and never ever look at it again! (except for the times to enjoy your precious treasure)

Who has access to the public keys, viewing keys and private keys?

Both Public Keys and Viewing Keys are known to the buyer and the artist (seller).
You can send in a request(along with your order) to delete the artist’s copy of the viewing key (which will primarily be used to know the number of units that are funded with ZEC and sharing that statistic at art exhibitions in the future).
The only copy of the private key is present on the piece of paper inside the artwork, it starts with “secret-extended-key-main…” and is more than 200 characters long.
The 70-80 character code you see on the back of the ZEC Cabochon is the Shielded Address. You can fund the ZEC Cabochon using the engraved public key.
Zcash goes above and beyond other cryptocurrencies. With Zcash, you control what information you share. Shielded addresses and their associated balances are not visible on the blockchain. Only “viewing keys” can be used to share transaction details with trusted third parties for compliance or audits. There is a mathematical relationship between the shielded address and the private key inside. The Zcash is actually located on the public Zcash ledger which is decentralized across the internet and it is inaccessible to anyone unless the private key is imported into a compatible Zcash wallet software.

Who is behind this project and what is the motivation?

@nighthawk24 from Nighthawk Wallet is behind CryptoCabochon
The idea behind making the CryptoCabochon was the longing to have a physical object to hold cryptocurrency. Cassacius coins for Bitcoin were famously sold loaded up with Bitcoin and since then there haven’t been options for non-Bitcoin marked artwork. CryptoCabochon was made to bring the virtual world to the physical world with a touch of art.

Can I resell it?

Yes, as a buyer, you have full rights to resell the CryptoCabochon you own.

How do I know there are no copies of the private keys?

The purchase of CryptoCabochons requires trust in the artist(nighthawk24) and the key generation process. Private Keys were generated on a newly purchased laptop using zcashd command line tools and then printed on an offline laser printer on Xerox Bold Digital 100 White Brilliance 32lb acid free premium quality laser paper for longevity. The private keys from the laptop have been deleted and the hard disk destroyed and dumped into several different garbage disposals after locking in the keys inside the artwork. No backups have been made and the only version of the private key is present on the paper inside the artwork. The units are sold unloaded and it is up to the sole discretion of the buyer to load the CryptoCabochon with ZEC.

How do I redeem the private keys?

This step requires destroying the art to move the ZEC value out.
The frame can be drilled to separate out the private key holder and the artwork.
And then some more drilling out the rivets to separate the 2 plates that hold the private keys.
Much care has been taken to design the unit such that it is almost impossible to put it back together if there are attempts made to open it. However, it is artwork, not a cold-storage vault, and thus the buyer should ensure reasonable physical security precautions.

Care instructions:

The ZEC Cabochon artwork is not water-proof and may be affected due to high-humidity when considering 250+ year plans. There have been numerous studies citing Black & White prints on Premium Glossy paper to last for 250-400 years at the minimum and the fact that the paper is locked inside an anodized compartment should slow down the process of oxidation inside. Source - Epson
Store the CryptoCabochon in an air-tight/anti-corrosion bag(provided) for longevity.
For the outside, clean with mild soap and soft cloth only, the chemical protectant on the plexiglass might get scratched due to repeated cleaning.

Recommendation for first time crypto art buyer:

Do not risk the majority of your savings in the artwork as this is an experiment,
If you are still interested in owning one of the limited units, use it as a memo diary and send messages to it and use a Zcash light client such as Zecwallet Lite to import the viewing key to see & share the messages! (See website link for instructions)
While noting that the only way to move the funds out is to break open the art and find the private key inside as long as the unit has been well cared for.

Recommendation for ZEC whales/hodlers:

Buy 2 units, one to load up 7 or 21 ZEC to lock it in storage and second one to sit at your desk to enjoy the art work and to send private z2z memos, knowing that every message will be stored on the Zcash blockchain forever! (and retrievable by the provided viewing key)

Recommendation for paranoid ZEC hodlers:

Buy a 3rd unit just to break open and verify that a working private key does exist! Like the Cut-and-Choose Protocol! (Doing this means you don’t trust the maker of the art so there’s really no need to buy the art in the first place! Instead please let someone else own it!) This technique in cryptography is called cut-and-choose and is used a lot in multiparty computation. Crépeau C. (2005) Cut-and-choose protocol In: van Tilborg H.C.A. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA.


Do not send ZEC to the artwork that you cannot afford to lose.
CryptoCabochon is an experimental art project sold as a final sale without returns or warranty. Please ask away questions at z2z.to/CryptoCabochon or Twitter @CryptoCabochon

UPDATE: Increased response time to 7 days due to the manual nature of checking a private z2z transaction. And added additional payment options via coinbase commerce.


This is beautiful and awesome. :heart_eyes:

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These are fantastic & totally unique!
Once the world opens again you might consider approaching moma.org to include a couple pieces in an upcoming metalworks exhibition.
The best way to get in is through a trustee contact. If anyone in the upper echelons of zec finance has a contact to anyone on this list, that’s your door.

How long does it take to make a single unit?
Absolutely gorgeous * applause *

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Thank you for the MoMA exhibit suggestion! As a MoMA fan myself I’ll try to reach out to anyone who has connections, I believe the ZEC Cabochon would be eligible for a 3D virtual exhibit too if they have anything like that in the works.

The time to make the ZEC batch was around 12 weeks of execution after a 4 year planning phase to make the crypto art project. The idea and Swarovski crystals were procured in 2016 while I was touring museums across Europe.

A lot of things had to come together from finding a milling partner(that gave private access to the workshop for locking the paper wallet), working through Trump’s Section 232 tariff on Aluminum, finding a small batch anodizing shop, the transfer of 50+ year old paintings from half way around the world for digital scanning and designing a screw-less permanent locking frame mechanism.


These look great, and I recently mentioned here that I’d like to see similar options in Zcash to Cassacius coins.

My main issue with these now is that Zcash developers have recently indicated that they would be prepared to destroy the value of Zcash in legacy Zcash shielded pools. This makes these applications unfeasible IMO which is unfortunate.

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Zcash developers don’t have the ability to do something like that. Only Zcash users as a whole do, by opting in to new consensus rules that stop honoring certain old coins.

Ok, let me rephrase that, ECC developers suggesting that destroying the Zcash held in legacy Zcash shielded pools is an option, and possibly a preferred option, i.e. the suggestion itself, concerns me (with regards to both my confidence in the viability of applications such as this, and also how statements like this are perceived in the wider ecosystem/industry).

Note: I do agree that Zcash can’t realistically directly support every pool forever, but I also believe that there must be a way for someone to dig up their buried Zcash at any point in the future and be able to transact with it.


While having a loaded ZEC Cabochon is a solid ordeal, making cases like the unit itself being used as a collateral at a bank!

My favorite application is to use the viewing-key and send memos to the art work and share your tales with your future generations. Assuming that the viewing key is secured & z2z messages in the Sapling pool are preserved on the Zcash blockchain forever.