SPACE ID is building a universal name service network with a one-stop identity platform to discover, register, trade, and manage web3 domains. It also includes a Web3 Name SDK and API for developers across blockchains, providing a multi-chain name service for everyone to easily build and create a web3 identity.

The Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockchain. Its purpose is to map human-readable names like 'alice.eth' to machine-readable identifiers such as Ethereum addresses, other cryptocurrency addresses, content hashes, and metadata. ENS also supports 'reverse resolution', enabling Ethereum addresses to be associated with metadata such as canonical names or interface descriptions. ENS has similar objectives to DNS, the Internet's Domain Name Service, but has a significantly different architecture due to the capabilities and constraints provided by the Ethereum blockchain. Like DNS, ENS operates on a system of dot-separated hierarchical names called domains, with the owner of a domain having full control over subdomains.

Doma Protocol is a blockchain built for DomainFi that aims to help modernize and unlock liquidity for all domain names. Think of it as turning domain names into composable, programmable assets.

D3 is a next-generation domains company building interoperable web2<>web3 domain names. Its goal is to empower and offer secure, decentralized identities, with domain names at the forefront.

Freename is a TLD and domain name registration platform that allows its users to search for and register any kind of TLD. On Freename, users can build their own Web3 domain ecosystem to generate passive income from royalties.

Decent.land is a set of Web3 social protocols for identity, DAO governance, and social networking. Built on Arweave, it stores all data on-chain, making it immutable and permanent. Arweave Names Service (ANS) is an identity and social metadata protocol built on Arweave and serves as the username layer of decent.land, as well as a human-readable proxy for wallet addresses, supported by ViewBlock. Ark is a multichain identity linking protocol that powers decent.land, ANS, and any other applications that rely on users attesting to their identity on other chains. ar.page is a web app that renders ANS metadata in a page displaying user profiles, and aggregates a feed of activities over the Arweave network (Ardrive, Koii, Permacast, etc.).

Established in 2021, d.id is a pioneer in decentralized identity (DID) systems. The company provides an array of DID-based solutions aimed at promoting community building and digital identity. Their product lineup includes .bit, a barrier-free DID issuance platform for communities and also a DID system for individuals; Voty, the first DID-based community governance system; SoulFrag, the first DID-based reputation management system; and d.id Profile, a DID-based profile for users to showcase milestones and accomplishments. With about 280,000 registered accounts and integration with more than 140 wallets and dApps, d.id is committed to building a trusted and inclusive DID ecosystem.

SNS is the user identity infrastructure layer on Solana. The .sol domain name can be used as your payment method, web3 username, and on-chain identity.SNS is building a composable and interactive web3 identity to help anyone anywhere connect to each other with an intuitive and user-friendly omni-chain experience.

Berakin is a name service based on Berachain that provides customizable profiles containing aggregated data from users' on-chain and off-chain activities.

PolkaDomain is a DNS and NFT marketplace built on Polkadot, providing decentralized domain name services. Users can take control of their digital identity and data with PolkaDomain, and claim and save unique domains as NFTs.

TNA is a naming protocol for Bitcoin designed to improve its usability and broaden its array of assets and primitives. Supporting multiple assets, TNA seamlessly integrates with all Bitcoin layer 2 solutions. It utilizes its DA framework, known as the TNA Core, to boost the mainnet’s capacity for managing cross-chain interactions and improving network interoperability.

Cronos ID is a decentralized identity and communication layer built on Cronos. On a broad level, Cronos ID will give users the ability to send and receive information on-chain, powered by human-readable identifiers.

Sui Name Service (SuiNS) is a service that simplifies users' web3 identities, websites, and wallets.

Evmos Domains is a distributed and extensible naming system based on the Evmos blockchain. Its purpose is to map human-readable names, like "alice.evmos", to machine-readable identifiers, such as Evmos or Ethereum addresses, other cryptocurrency addresses, content hashes, and metadata. Additionally, Evmos Domains supports "reverse resolution", allowing users to associate metadata, such as canonical names or interface descriptions, with Evmos addresses.

Aptos Names Service (ANS) now allows all Aptos users to use a human-readable .apt name for their Aptos wallet address instead of their public key. ANS provides improved network tooling for all applications on Aptos' blockchain and will offer numerous ecosystem integrations.

Tezos Domains is a distributed, open, and extensible naming system that uses the Tezos blockchain. Its main purpose is to translate a user-friendly and meaningful alias to its corresponding Tezos address and vice versa.

The Butterfly Protocol is a cross-chain, decentralized Domain Name System that offers Non-Fungible Token domains.

AllDomains is a Web3 platform to create, register, and trade customizable Web3 Identities for .everyone. With AllDomains any user can choose not only a name they desire but also the community they wish to associate with, adding a new layer of customization to their Web3 identity. Be it a Token, an NFT collection, or a DAO, everyone can create their own TLD and unite their whole community under a unique brand.

ZNSConnect is a leading cross-chain Web3 naming service provider, providing seamless digital identity support for more than 25 blockchains. It redefines how users interact with Web3 by offering decentralized, AI-driven identity solutions.

Trust Domains is a distributed domain service based on blockchain technology. These domains can use human-readable names to replace cryptocurrency addresses, content hashes, etc. It is deployed on Ethereum, Binance Smart Chain, and Conflux blockchains. Unlike traditional domain names, Trust Domains never expire; users only need to purchase it once, with no renewal fee.

DecentraWeb is a decentralized implementation of the DNS base layer protocol on the Ethereum blockchain. It enables anyone to become a Web3 domain registrar.

Punk Domains is a web3 domain/name protocol that sets it apart from others, such as ENS and UD. It can issue multiple domain extensions and allows for various types of names, including single-purchase domains, renewable domains, and soulbound domains. It has a modular architecture that can cover any use case, and any DAO or web3 community can get their own domain extension via the Punk Domains protocol.

NameDAO is a community-led, platform-built on Solana. Anyone can propose, fund, and have a new top-level domain (TLD) extension (e.g. .fam, .fam, .fa vibe）。 Think of it as a "decentralized gTLD crowdfunding platform", powered by cryptocurrency.

Rave Names is a scalable web3 username system on Fantom that allows users to set an avatar and other profile data.

LINKKEY is a Web3 social open protocol that contains a decentralized user name system for SNSs. It supports the issuance of NFT identities for individuals and NFT identities for communities. Users holding the same NFT will automatically create group chats.

.box is a fully tokenized top level domain that is compatible with DNS and ENS. Every domain supports decentralized ownership and records management, payments, Web3 authentication, email, websites, and Web3 messaging. .box domains can resolve Web2 email addresses and websites, providing a bridge between the decentralized and centralized web.

Xname is a proper name inscribed by ordinals, as a decentralized standardized name for crypto-bitcoin enthusiasts, users use it to get .x popular domain names.

A3S Protocol is a multi-chain protocol designed to create the next generation of address standards. It enables secure trading, leasing, and escrow of addresses, providing liquidity and integrability, allowing them to be priced as a basic on-chain service.

BtcName is a DID standard for writing names to Bitcoin by Ordinals Protocol with plain text format.

OneID is an Universal Identity To The Digital World. OneID provides a comprehensive solution in the ecosystem that provides a unified multichain identity that unlocks infinite possibilities in the digital world. OneID offering a unified multichain identity across 70+ blockchains. In addition, the OneID SDK & API empowers developers to build on-chain identities with ease. OneID do not simply create another ID aggregator, but the universal name service solution to provide more seamless access to multiple blockchains.