Weighted NFTs

EIPS/DAR-vote-weight.md

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+## Preamble
+
+eip: 874
+title: Weighted NFTs
+author: Alex Sherbuck <Alex@igave.io>
+type: Standard Track
+category: ERC
+status: Draft
+created: 2018-02-06
+
+##  Summary
+Not all NFTs are created equal. Nothing exists to distinguish one NFT from another. Weight allows a DAO or other external actors to recognize some value for unique asset holdings.
+
+## Motivation
+This allows DAOs to form based on asset/NFT holdings instead of just ERC-20 token holdings. Asset holders may decide how to set their token weight.
+
+## Specification
+The Weighted Digital Asset Registry is an extension for ERC-821 that tracks asset weight. This follows the standard set in [ERC821](https://github.com/ethereum/EIPs/issues/821) and adds:
+
+## Weighted DAR
+Extension to ERC-821
+
+#### totalWeight
+`function totalWeight() public view returns (uint256);`
+Returns the total weight tracked by the DAR
+
+#### isWeighted
+`function isWeighted() public view returns (bool);`
+This method returns true.
+
+#### weightOfAsset
+`function weightOfAsset(uint256 assetId) public view returns (uint64);`
+Returns the total weight of an individual asset.
+
+#### weightOfHolder
+`function weightOfHolder(address holder) public view returns (uint256);`
+Returns the total weight of the assets controlled by the holder.
+
+#### changeWeight
+`function changeWeight(uint256 assetId, uint64 weight) public;`
+Changes the weight of the asset to the given value.
+
+#### Events
+```
+event TransferWeight(
+    address indexed from,
+    address indexed to,
+    uint256 indexed assetId,
+    uint64 weight
+  );
+event ChangeWeight(
+    uint256 indexed assetId,
+    uint64 weight
+  );
+```
+
+## DAR Adapter
+An adapter that exposes a `balanceOf`.
+
+#### voteWeightAddress
+`function voteWeightAddress() public view returns (address);`
+Returns the address of the Weighted DAR.
+
+#### balanceOf
+`function balanceOf(address holder) public view returns  (uint256);`
+Calls the `weightOfHolder` function of the Weighted DAR.
+
+## Implementation
+This will be updated to the most recent ERC-721 standard.
+
+[Weighted Digital Asset Registry](https://github.com/I-Gave/erc821/tree/weighted-registry/contracts) - w/ DAO voting
+
+## Rationale
+Including an adapter for the DAO to reference holder weight minimizes the impact on current DAO code that references an ERC-20's `balanceOf`
+
+## Copyright
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).