The ITIN “2JRF-SZZ2-3” has been assigned to the “Horizen” (ZEN) token by ITSA.

Would you like to have an ITIN assigned to your project?

Our application process is straightforward. 5 minutes is all we need from you to get started. Read more about ITINs below.

About Horizen (ZEN)

ZEN is the native cryptocurrency of Horizen. Its optional privacy feature allows you to control your digital footprint. ZEN offers two different types of addresses:

  • T-Addresses – Regular addresses for making transactions similar to bitcoin. These transactions are public and transparent on the blockchain.
  • Z-Addresses – Also known as shielded addresses, transactions between Z-Addresses are completely private and anonymous. They leverage zero knowledge cryptography to obscure sender and recipient addresses, as well as amount sent.

Balances in shielded addresses are private, however, any regular addresses on the receiving end will deshield the token and reveal the value received on the blockchain.


About ITSA

The International Token Standardization Association (ITSA) e.V. is a not for profit association of German law that aims at promoting the development and implementation of comprehensive market standards for the identification, classification and analysis of DLT- and blockchain-based cryptographic tokens.

Need to Identify a Token? For Example in a Legal Contract? Use ITIN.

When transferring, buying or referencing a token (e.g. in a contract), you have to make sure it is the correct one on the correct ledger rather than a copy on an obscure fork. But how to identify these tokens uniquely, permanently over time and internationally? Referring to tokens with their name, ticker or smart contract address only is prone to errors, ambiguity and misspellings.

For this, ITSA has developed the International Token Identification Number (ITIN) and its technical foundation, the Uniform Token Locator (UTL).

Efficient and seamless token identification

An ITIN provides the details for the exact identification and location of tokens at any time and comes with great benefits:

Unique identifier

Never becomes ambiguous through potential forks.

Referencing tokens

Can be used in legal contracts when a token needs to be referenced (e.g. in token purchase agreements).


Can efficiently be used in e.g. accounting systems without any additional effort.

Seamless integration

Allows for a seamless integration with other tools, algorithms, devices and machines (e.g. with a scannable QR code).

Swift generation

Registering an ITIN takes 5 minutes and close to zero cost.

Supports any DLT network

Regardless of the underlying DLT protocol – e.g. Ethereum, Stellar, Hyperledger, Corda – the ITIN can be used.

  • "ITIN is the first identifier that embraces the decentralized nature of the token economy. Tokens can now be uniquely identified and referenced in e.g. legal contracts without worrying about forks. This is a decisive foundation for a healthy growth of the token ecosystem."

    Thomas Faber Project Manager ITIN at ITSA

How does it work?

What makes the ITIN so powerful is its technological foundation, the Uniform Token Locator (UTL). Think of a website in the WWW. It can be uniquely accessed by an internet address – precisely, an URL – even if the content itself is moved from one server to another. In the same way, tokens can be uniquely addressed through the UTL. Just like the URL for websites consists of different components such as a protocol and a subdomain, the UTL for tokens includes the following parts:

What is needed to technically identify a token?

The UTL consists of these elements and allows a unique identification of tokens. These elements are automatically provided by ITSA when registering an identifier:

  • Genesis hash: The hash of the genesis block of a blockchain.
  • Post-fork hash (PFH): The hash of the first finalized block complying to the protocol rules of the newest blockchain fork. This hash is generally unique.
  • Recent hash (RH): The newest known hash of the chain.
  • Optional: Smart contract address: Required for non-native tokens.
  • Optional: Token sub-address: Required for multi-token contracts.

What is an example for a UTL?

Are you interested in the technological underpinning?

With the post-fork hash (2) and smart contract address (4) combined most tokens can be identified. Non-fungible tokens can also be addressed by adding a token sub address (5). The optional recent hash can be added as a metric for the reliability of the UTL. As new forks in a blockchain can occur at any time after issuance of the UTL, including the most recent hash available (3) helps assessing the UTLs ambiguity.

Shorten the long UTL to a short ITIN

UTLs are quite lengthy even though they are technically correct and needed for a unique identification. We therefore developed the following approach: ITIN. It works like an UTL shortener allowing long UTLs to have a short identifier:

What is an example for an ITIN?

Are you interested in even more technological backgrounds?

You can easily resolve UTLs to ITINs using ITSA servers. So, you could for example take some smart contract from Ethereum and ITSA will return the ITIN (“reverse lookup”), in case an ITIN has been assigned.

Example: Here is the UTL page of Binance. On this page you can easily see the variable ITIN that represents the ITIN of Binance’s BNB token.

You can also obtain UTLs based on an ITIN. This works as follows: From the ITIN page, one can always generate an up-to-date UTL.

Example: Here is the ITIN page of Tether. On this page you can find existing UTLs for this token and a button to generate the most up-to-date UTL.

Learn more about ITIN and the UTL in the following short YouTube video or read our Medium article on the topic.

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