Decentralised Identity (DID) is a framework for creating, managing, and controlling digital identities without relying on centralised identity providers like Google, Facebook, government databases, or certificate authorities. Using blockchain and cryptographic standards, DIDs enable "self-sovereign identity" — complete user control over personal credentials without depending on any single institution.
THE PROBLEM WITH CENTRALISED IDENTITY
Today's digital identity is controlled by platforms: Google and Facebook "log in with" services give these companies data about your activity everywhere you authenticate. Government-issued digital IDs are controlled by governments that can revoke or freeze access. Credential data (degrees, professional licences, medical records) is siloed in institutional databases — you cannot carry your verifiable credentials between systems without contacting each institution separately. Data breaches expose centralised credential databases to hackers.
HOW DECENTRALISED IDENTITY WORKS
DIDs (Decentralised Identifiers): A DID is a unique identifier (URI) that references a DID Document stored on a blockchain or decentralised storage network. The DID Document contains public keys and service endpoints associated with the identity. The DID owner controls the private keys — no institution can revoke a DID. Example: did:ethr:0x1234...abcd
Verifiable Credentials (VCs): Digital equivalents of physical credentials (driver's licence, university degree, KYC verification). Issued by trusted authorities, cryptographically signed, and stored by the credential holder. Can be selectively disclosed to verifiers — prove you are over 18 without revealing your date of birth.
Zero-Knowledge Proofs for Identity: ZK proofs enable privacy-preserving identity verification — prove compliance with a jurisdiction requirement or age threshold without revealing the underlying personal data.
KEY PROJECTS AND STANDARDS
W3C DID Standard: The foundational specification defining DID and VC formats. Ethereum Name Service (ENS): .eth names function as DIDs on Ethereum. Polygon ID: ZK-based identity system built on Polygon. Civic: KYC verification as a reusable credential on blockchain. Worldcoin: Biometric iris scanning to create proof-of-personhood credentials.
Terms in addition to the Decentralised Identity (DID)
A blockchain is a subset of a distributed database. The Bitcoin inventors originally prototyped the system in 2008. This modern database is made up of separate blocks that are connected together in a chronological chain. Blockchains may be used to store a wide range of data types. It has mostly been utilized as a public ledger for bitcoin transactions to date. A peer-to-peer network comprised of independent nodes uses a consensus process to ensure the blockchain's security and legitimacy. Each node in the network keeps a public and immutable copy of the data.
2 Factor Authentication is a security measure with two layers. It is used by the majority of cryptocurrency exchanges. To log in, you must provide not only a password, but also a code obtained, for example, from the Google authenticator.
An airdrop is a method of distributing coins. End users can typically obtain coins for free or in exchange for doing a small task, such as subscribing to a newsletter, sending a tweet, or inviting others via a personal affiliate link. Cryptocurrency airdrops — the act of depositing cryptocurrency into public crypto wallets — are utilized as a marketing, liquidity creation, and network bootstrapping technique for many different types of blockchain initiatives.
Altcoin - "alternative coin" - is any kind of digital currency other than Bitcoin. Since the launch of Bitcoin, the world's first digital currency, many altcoins (as well as supporting blockchains) have been created. Altcoin digital currencies share many similarities to Bitcoin, but consistently and have significant differences. There are about 20,000 altcoins, and this number is expected to grow significantly in the coming years. Altcoins often develop Bitcoin features. Ethereum, currently the most widely used blockchain, supports digital contracts and separate applications where Bitcoin does not. Altcoins are also often created to cater to the needs of different users. The Litecoin blockchain, for example, can process payments quarterly for the duration of Bitcoin.
Cold storage is the way to store cryptocurrency offline. The word refers to the use of offline wallets that are not connected to the internet. Cold storage is the most secure way to keep cryptocurrencies since an offline currency becomes less likely to be hacked and stolen. Paper wallets, printed renditions of private keys, and offline hardware and software wallets are all examples of cold storage.
