Marat Nusurov

ERC-XXXX: Address-Derived Non-Transferable Token

Company: Personal project Role: Author Stack: Solidity 0.8.35 · Foundry · ERC-165 · ERC-721 · ERC-5192 Period: 01/2026 – present

Overview

Draft ERC standard for soulbound tokens where tokenId derives deterministically from owner address XOR contract address: tokenId = uint256(uint160(owner)) ^ uint160(address(this)). Enforces one-token-per-address at protocol level with minimal storage footprint.

Technical Scope

Deterministic Token ID

• tokenId = owner XOR contract address - unique per owner per contract, no sequential counter
• Single mapping(uint256 => bool) for existence tracking instead of owner mapping

Non-Transferability

• Transfer, approve, and operator methods removed entirely (not overridden)
• ERC-5192 locked() always returns true

Key Engineering Decisions

Decision	Rationale
XOR with contract address	Makes ID unique per-contract, not just per-owner globally
Remove transfer/approve entirely	Prevents accidental bypass vs. revert-on-call override
Extend ERC-721 Metadata & ERC-5192	Well-established interfaces; wallets and indexers support them natively, compatibility is free

Links & Archives

• GitHub: erc-address-derived-sbt
• ERC Discussion: Ethereum Magicians