Check out our:
Website https://cryptoproof.info/
Source code: github
Announcement: reddit
Announcement: bitcointalk
Follow us: twitter
Fund us: bitcoinstarter
Introducing Cryptographic Proof of Association:
Our new service which allows producers to detect if their 3D printed designs are being copied and consumers to know if their item is a clone at zero or near zero cost!
How it works:
CPOA is a concept made possible by the recent(ish) introduction of BIP32 functionality into cryptocurrencies like Bitcoin.
For those not in the know, BIP32 is a standard by which it is possible to create master private and public keys from which many ‘baby’ subkeys can be produced.
These subkeys are mathematically linked to one another so for example Bitcoins can be sent to a sub public key address generated by Alice who lives in the UK using the master public key but the funds can only be spent by Bob who lives in America and has the master private key.
This is clearly very useful but what else can we do with this?
We can use it for verification and ID!
Our idea is simple, businesses and individual people can register their master public key with our website which members of the public will be able to visit and confirm if a subkey they have been provided with belongs to the company/individual they believe it does.
Example use case:
In the future when you order an item from a vendor such as a cup or a toy it seems sensible to envision a scenario where rather than have the vendor mail it to you or send it by drone they instead send the blueprint to your 3D printer which produces the item instantly for you at home or maybe they print the item for you themselves and then physically send it but in either case how can you know that you purchased the item from the producer in question and not someone who ordered an item themselves, intercepted the blueprint or scanned the product which was delivered to them and just sold you a clone? This is a big problem in the pharmaceutical industry.
Cryptoproof solves this by providing a common location where vendors can register their bitcoin extended public keys allowing them to brand each item with a unique subkey address which cryptoproof can verify so that the consumer can know if a product originates from the producer that they think it does (by seeing if a verified account is associated with it) and if there is more than one copy of that item in existence (by seeing if/how many times that address has been submitted in the past).
Using bitcoin addresses for this purpose adds an extra dimension to the scenario because value can be transmitted to and from them which allows not only for verification but also can be used to keep an immutable record showing how much was paid for the item, who paid it and when the transaction took place.
This technology has the potential to save lives.
Another feature of this method is ‘blockchain unburdening’, the scanning and submitting of keys in this way does not involve the blockchain and will not contribute to any unnecessary bloat.
Bullets, condoms, electronic parts, photo ID (passports - drivers licenses), receipts, invoices, files (torrents - legal documents), pharmaceuticals, etc.
The list is endless.
Any/all feedback is appreciated 
