OEURO — EUR Clearing Token · Technical White Paper & Audit Reference 2.0

OEURO — Version 2.0

OEURO is a EUR-denominated clearing token designed for direct account-to-account settlement on Sei.
It is implemented as a restricted ERC-20 token with 6 decimals and a deliberately narrow functional scope.
Its primary purpose is clearing and settlement rather than market trading, speculative use or DeFi integration.

Ordinary circulation is designed for direct EOA-to-EOA transfers.
The reference implementation disables approve() and transferFrom(), and ordinary transfers to smart-contract recipients are rejected.

Minting and burning are explicit supply operations controlled by the manager.
Authorized oracles may submit MINT or BURN requests but cannot directly alter token supply.
Oracle requests remain valid for 24 hours and must be executed or rejected by the manager.
External clearing references are protected against replay through single-use proof handling.
The architecture therefore separates attestation authority from final settlement authority.

OEURO uses a restricted-recipient model for sensitive infrastructure addresses.
The reference contract is based on OpenZeppelin ERC-20 and Ownable2Step components.

Sei Testnet is the current public reference and integration environment.
The verified reference deployment is:

0x49A0D9D353e9b9860B137DFAA7f24ab83E14c7f7

Creation transaction:

0x97dfa508843181c4649215389c6be24f626b3510bb507d531a73e36255c37043

The deployed source has been verified on SeiScan with matching bytecode and ABI.

The OEURO smart contract remains strictly separated from deposit, custody and collateral-management activities.
Where an external EUR-denominated escrow or custody layer is used, EURC issued by Circle is the recommended collateral asset. Such custody and escrow functions remain outside the OEURO smart contract.

This Zenodo archive contains the Solidity source code, ABI, flattened contract, and the OEURO Technical White Paper & Audit Reference — Version 2.0.

Author: Denis Bouzon
ORCID: 0009-0007-8894-8902
Osnias Clearing

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