Non-transferable Token Issuer Registry

This document references issuers that have launched Soulbound / Account-bound / non-transferable tokens, or have planned to do so in the future.

Template

Here’s the template used for each issuer and the different pieces of information provided (when available). Feel free to open a PR to add/update an entry in the registry!

Protocol / DAO / Company Name

Credential / Tokens name

Implementation: Standard Interface they adhere to.

Repo: Repository that contains the smart contracts source code.

Details: Explanatory blog post or documentation.

Deployments:

Chain Id	Smart contract address
Chain Id following CAIP-2 format.	Smart contract address of the deployed token smart contract linked to the associated page on a block explorer (eg. Etherscan).

---

Issuers

Bright ID

Soulbound NFT

Implementation: Partial ERC721

Repo: https://github.com/BrightID/BrightID-Soulbound-NFT

Details: https://mirror.xyz/misterplus.eth/a3ytQ7hyN4yU1Cx_bX42TcwA1sy_8RWK9CKQYInYfbg

Deployments:

Bulgari

Address-bound Tokens

Implementation: ERC1238 (early proposal)

Repo: https://github.com/reasonedart/bulgari-gift-contract

Details: See Repo.

Deployments:

Chain Id	Smart contract address
eip155:137	0xEa58A24502f065A8Cd53b94424d7b0E82B6e697c

GoldFinch

Unique Identity Token

Implementation: ERC1155

Repo: https://github.com/goldfinch-eng/goldfinch-contracts

Details: https://docs.goldfinch.finance/goldfinch/unique-identity-uid

Deployments:

Chain Id	Smart contract address
eip155:1	0xba0439088dc1e75F58e0A7C107627942C15cbb41

MintKudos

Kudos

Implementation: ERC1155

Repo:

Details: https://mirror.xyz/mintkudosxyz.eth/jtExIbkK7KV01meH_PMcO9NQbHMV3XmpGECUQNwtG6k

Deployments:

Chain Id	Smart contract address
eip155:137	0x60576A64851C5B42e8c57E3E4A5cF3CF4eEb2ED6

Optimism

Citizens’ House NFTs

More details coming soon: https://community.optimism.io/docs/governance/#how-is-optimism-governed

Orange DAO

YC Gem

Implementation: ERC721

Repo:

Details: https://badge.orangedao.xyz/

Deployments:

Chain Id	Smart contract address
eip155:137	0xc1C6A331D4013f40Ca830C06eD47564D0d2b21cD

Otterspace

Soul Otter

Implementation: ERC4973

Repo: https://github.com/otterspace-xyz/otterspace-contracts

Details: https://otterspace.mirror.xyz/Cec_bTSsLgcohuaV5dkOJTbaYuFB6tF8jhxzN_30k1A

Deployments:

Chain Id	Smart contract address
eip155:4	0x9a8469255a7d41a715e539a22eb1127be0973a1e

RabbitHole

Adventure Badges

Implementation: ERC1155

Repo:

Details: https://claim.rabbithole.gg/

Deployments:

Chain Id	Smart contract address
eip155:137	0xac4255ec6885e50352a1957062ac418c2cc94e27

Sismo

Implementation: ERC1155

Repo: https://github.com/sismo-core/sismo-protocol

Details: https://docs.sismo.io/sismo-docs/sismo-protocol/badges

Deployments:

Chain Id	Smart contract address
eip155:137	0xF12494e3545D49616D9dFb78E5907E9078618a34

Tribz

OpenZeppelin Souldrop

Implementation:

Repo:

Details: https://blog.tribz.xyz/openzeppelin-contributor-souldrop

Deployments:

Unlock Protocol

Unlock keys

Implementation: ERC721 with custom logic to make keys transferrable or non-transferrable

Repo: https://github.com/unlock-protocol/unlock

Details: https://docs.unlock-protocol.com/move-to-guides/how-to-make-keys-non-transferrable

Deployments:

Verida Protocol

Verida Badges

Implementation: ERC721 (including ERC721Metadata) and EIP-5192

Repo: https://github.com/verida/blockchain-contracts

Details: More details coming soon.

Deployments: More details coming soon.

Violet Protocol

More details coming soon.