Owner Data Facet

@perfect-abstractions/compose/access/Owner/Data/OwnerDataFacet.sol

Read-only Owner data access for diamonds

Key Features

• Exposes the contract owner via external owner().
• Shares OwnerStorage at erc8042:erc173.owner with OwnerDataMod and other Ownership facets.
• Read-Only facet

Storage

State Variables

Property	Type	Description
STORAGE_POSITION	bytes32	Owner storage position within the diamond (Value: keccak256("erc173.owner"))

OwnerStorage

Definition

/** storage-location: erc8042:erc173.owner */
struct OwnerStorage {
  address owner;
}

Functions

owner

Returns the address of the diamond owner

function owner() external view returns (address);

Returns:

Property	Type	Description
-	address	The current owner, or address(0) if unset or renounced.

Best Practices

• Transfer ownership with a facet that uses OwnerDataMod (for example OwnerTransferFacet) so owner() always reflects the real owner.
• Avoid defining a second facet that writes to a different owner slot; keep all -owner state at erc173.owner
• Use setContractOwner() in OwnerDataMod to initialize the owner when constructing your diamond.

Last updated:June 5, 2026