CEDAR
A blockchain registry for Linked Data.

Disclosing your URL does the following:

• Creates a public, permanent record of your URL on the Ethereum Blockchain, allowing you to register URLs in CEDAR.
• Binds your URL to the Ethereum address provided by MetaMask (or other Web3 provider such as the Ethereum Mist browser)
• Binds your Ethereum address to the disclosed URL.
• Consumes a bit of Ethereum 'Gas', which costs some money and helps prevent abuse.

You must host a binding file at https://your.url/cedar.eth

• This public file will be accessed by any party wishing to ensure the validity of registered URLs stored in this registry.
• Removal of the file will cause all records registered using this address and your domain to fail validation.
• This file must be available to cross-domain (CORS) requests.
  • Apache2/HTTPD configuration (make sure the 'headers' library is enabled!)

        <Files "cedar.eth">
            Header set Access-Control-Allow-Origin "*"
        </Files>

• This file will be accessed often, but will be cached when possible.

Download binding file

---

My Website URL:
Please input Website URL.
Close Register My Website URL

Transferring a registration assigns ownership of the registration to another Ethereum address:

• You will lose the ability to update, transfer, or unregister the registration.
• The recipient must have a website URL registered.

---

Recipient URL: Ethereum Address: Please input recipient URL or address.
Close Transfer Record

URL:

• The record at this URL will be accessed to compute the hash.
• The record at this URL must be cross-domain (CORS) accessible.
• If the data at this URL changes, the registration will become invalid and require updating.

Recipient (optional):

• This recipient is pseudononymous, but should be treated like public information.
• Anyone who knows the text entered here (like an email address) can determine the recipient of this record.
• Additionally, the recipient's records are grouped.
• These weaknesses allow for access to a recipient's registered data without processing over all registered records.

Agent: Hash: Allow registration owner to update hash?
Allow transfer of registration ownership?
Allow de-registration by the registration owner?

Please input a URL.

Close Compute Hash Register

CEDAR lets you:

• Publicly register digital learning, learner (or other) records on an Ethereum Blockchain.
• Create a provable binding tying an Ethereum address to a website URL.
• Manage registered records.

CEDAR:

• Is this website paired with a smart contract on the Ethereum Blockchain.
• Requires a small amount of payment (in the form of "Ethereum Gas") paid to the Blockchain per operation, to prevent abuse.
• Validates website bindings for each record displayed and verifies the records have not changed.
• Lets you discover records for individuals, if you know what identifier their records are registered under.

CEDAR performs the operations of a registry. This registry:

• Does not store records, instead it stores references (URLs) to records.
• Keeps a "checksum" which ensures the records at each URL have not been altered since they were registered.

CEDAR lives on an Ethereum blockchain. The blockchain:

• Provides an indellible history of all operations performed on CEDAR.
• Removes the need for a central authority.
• Is replicated many thousands of time, making it reliable and very resistant to forgery.

To use CEDAR, you need:

1. The Ethereum Mist browser or MetaMask plugin pointed at the Rinkeby Test Network (or another Ethereum web3 enabled browser.)

To register records on CEDAR, you need:

1. Ethereum to fund your endeavours, which can be found at the Rinkeby Faucet.
2. A website that you can place a file on to bind that URL to your ethereum account.

Close