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Update ERC-7201: Fix solidity formula #201

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SamWilsn merged 1 commit into from
Apr 23, 2024
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Update ERC-7201: Fix solidity formula #201

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2 changes: 1 addition & 1 deletion ERCS/erc-7201.md
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Expand Up @@ -36,7 +36,7 @@ A namespace in a contract should be implemented as a struct type. These structs

### Formula

The formula identified by `erc7201` is defined as `erc7201(id: string) = keccak256(keccak256(id) - 1) & ~0xff`. In Solidity, this corresponds to the expression `keccak256(abi.encode(uint256(keccak256(id)) - 1)) & ~bytes32(uint256(0xff))`. When using this formula the annotation becomes `@custom:storage-location erc7201:<NAMESPACE_ID>`. For example, `@custom:storage-location erc7201:foobar` annotates a namespace with id `"foobar"` rooted at `erc7201("foobar")`.
The formula identified by `erc7201` is defined as `erc7201(id: string) = keccak256(keccak256(id) - 1) & ~0xff`. In Solidity, this corresponds to the expression `keccak256(abi.encode(uint256(keccak256(bytes(id))) - 1)) & ~bytes32(uint256(0xff))`. When using this formula the annotation becomes `@custom:storage-location erc7201:<NAMESPACE_ID>`. For example, `@custom:storage-location erc7201:foobar` annotates a namespace with id `"foobar"` rooted at `erc7201("foobar")`.

Future EIPs may define new formulas with unique formula identifiers. It is recommended to follow the convention set in this EIP and use an identifier of the format `erc1234`.

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