Smart Contract Development
  • Introduction
    • What is a Transaction
    • Accounts and Signing
    • What is a smart contract
  • Learning Solidity
    • Introduction
    • Module 1
      • Variable Types
      • Variable Scope: State & Local variables
      • Global variables
      • Functions
        • View and Pure
        • Shadowing in Fuctions
      • Mapping
      • Require
      • Events
    • Project #1: Simple Registry
    • Module 2
      • Constructor
      • Data Location: Value & Reference
      • Interface
      • Import
        • Importing in Foundry
      • Inheritance
      • ERC-20
      • Checks-effect-interaction pattern
    • Project #2: Basic Vault
    • Module 3
      • Payable
      • Receive
      • Fallback
      • Returns
    • Project #3: ERC20+ETH Wrapper
    • Module 4
      • Immutable and Constant
      • Fixed-point Math
      • Abstract contracts
      • ERC-4626
      • Modifier + Inheritance +Ownable
      • Type
    • Project #4: Fractional Wrapper
    • Module 5
      • If-else
      • Libraries
        • TransferHelper
      • Chainlink Oracle
    • Project #5: Collateralized Vault
  • Compendium
    • Solidity Basics
      • Variable Types
      • Value Types
        • address
        • enum
      • Reference Types
        • strings
        • mappings
        • struct
        • Arrays
        • Multi-Dimensional arrays
      • Global Objects
      • Functions
        • Function types
        • Constructor Function
        • Transaction vs Call
        • Require, Revert, Assert
      • Function signature + selectors
      • Payable
        • Payable + withdraw
        • msg.value & payable functions
      • Receive
      • Fallback function (sol v 0.8)
        • Fallback function (sol v 0.6)
      • call, staticcall, delegatecall
    • Return & Events
    • Control Variable Visibility
    • Local Variables (Storage v Memory)
    • Data Location and Assignment Behaviors
    • Modifiers & Inheritance & Import
      • import styles
    • Interface & Abstract Contracts
    • ABI & Debugging
    • Libraries
    • Conditional(ternary) operators
    • Smart Contract Life-cycle
      • Pausing Smart Contracts
      • Destroying Smart Contracts
    • Merkle Trie and MPT
    • Merkle Tree Airdrop
  • Try & catch
  • Ethereum Signatures
  • EVM, Storage, Opcodes
    • EVM
    • Wei, Ether, Gas
    • Storage
    • ByteCode and Opcodes
    • Transaction costs & Execution costs
  • Reading txn input data
  • Data Representation
  • Yul
    • Yul
      • Intro
      • Basic operations
      • Storage Slots
      • Storage of Arrays and Mappings
      • Memory Operations
      • Memory: how solidity uses memory
      • Memory: Return, Require, Tuples and Keccak256
      • Memory: Logs and Events
      • Inter-contract calls
      • calldata
      • free memory pointer
    • Yul Exercises
      • read state variable
      • read mapping
      • iterate Array, Return Sum
    • memory-safe
  • Upgradable Contracts
    • Upgradability & Proxies
    • UUPS Example
    • Minimal Proxy Example
    • TPP Example
    • 🚧Diamond
      • On Storage
  • Gas Opt
    • Block Limit
    • gasLimit & min cost
    • Solidity Optimiser
    • Memory v calldata
    • Memory caching vs direct storage vs pointers
    • < vs <=
    • reverting early
    • X && Y, ||
    • constant and immutable
    • caching sload into mload
    • Syntactic Sugar
    • using unchecked w/o require
    • Compact Strings
    • Calling a view function
    • Custom errors over require
    • usage of this.
      • multiple address(this)
  • ERCs & EIPs
    • ERC-20.sol
      • Core functions
      • transfer()
      • transferFrom()
      • TLDR transfer vs transferFrom
    • Landing
      • ERC721.sol
      • EIP-721
        • LooksRare
        • Page 1
      • ERC-1271
      • EIP-2981
      • ERC-165
      • EIP-1167: Minimal Proxy Contract
    • VRFConsumerBase
    • UniswapV2Library
  • Yield Mentorship 2022
    • Projects
      • #1 Simple Registry
      • #2 Basic Vault
      • #3 ERC20+ETH Wrapper
        • setFailTransferTrue
      • #4 Fractional Wrapper
      • #5 Collateralized Vault
        • Process
        • Vault.sol
        • Testing
        • Chainlink Oracles
        • Pricing + Decimal scaling
        • Refactor for Simplicity
      • #9 Flash Loan Vault
        • Implementing ERC3156
        • Full code for lender
        • Ex-rate calculation
    • State Inheritance Testing
    • Testing w/ Mocks
    • Yield Style Guide
    • Github Actions
    • TransferHelper.sol
    • math logic + internal fn
    • Interfaces: IERC20
  • Foundry
    • Overview
    • Importing Contracts
    • Testing
      • stdError.arithmeticError
      • assume vs bound
      • Traces
      • label & console2
      • std-storage
  • Smart Contract Security
    • Damn Vulnerable Defi
      • 1. Unstoppable
      • 2. Naive receiver
      • 3. Truster
      • 4. Side Entrance
      • 5. The Rewarder
      • 6. Selfie
      • 7. Compromised
      • 8. Puppet
      • 9. Puppet V2
      • 10 - Free Rider
    • Merkle Tree: shortened proof attack
  • Fixed-Point Math
    • AMM Math
  • Solidity Patterns
    • checks-effects-interactions pattern
    • Router // batch
    • claimDelegate: stack unique owners
    • claimDelegate: cache previous user
  • Array: dup/ascending check
  • Deployment
    • Behind the Scenes
    • Interacting with External Contracts
    • Logging, Events, Solidity, Bloom Filter
  • Misc
    • Mnemonic Phrases
    • Bidul Ideas
  • Archive
    • Brownie Framework
      • Brownie basics
        • storing wallets in .env
        • Deployment to ganache
        • Interacting with contract
        • Unit Testing
        • Testnet deployment
        • Interacting w/ deployed contract
        • Brownie console
      • Brownie Advanced
        • Dependencies: import contracts
        • helpful_scripts.py
        • verify and publish
        • Forking and Mocking
        • Mocking
        • Forking
      • Testing
      • Scripts Framework
        • deploy.py
        • get_accounts
        • deploy_mocks()
        • fund_with_<token>()
      • Brownie Networks
    • Brownie Projects
      • SharedWallet
        • Multiple Beneficiaries
        • Common Code Contract
        • Adding Events
        • Renounce Ownership
        • Separate Files
      • Supply Chain
        • ItemManager()
        • Adding Events
        • Adding unique address to each item
      • Lottery
      • Aave - Lending and Borrowing
        • Approve & Deposit
        • Borrow
      • NFT
      • Advanced Collectible
        • adv_deploy() + Testing
        • Create Metadata
        • Setting the TokenURI
    • node npm
    • Ganache
    • Truffle
    • Remix
    • Installing Env
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On this page
  • Royalties
  • EIP-2981
  • Implementations
  • Royalty Registry
  • New NFTs - embed royalty info
  1. ERCs & EIPs
  2. Landing

EIP-2981

PreviousERC-1271NextERC-165

Last updated 2 years ago

  • NFT standards (/) only deal with ownership state tracking, approvals, and direct transfers.

  • They contain no functionality for acquiring and splitting royalties.

Royalties

  • royalties are not a concept that’s enforceable by a collection itself.

  • There have been attempts to build collection contracts that come with their own marketplace logic and prohibit transfers outside of their controlled environment, but they never gained much attention since markets are made on the dominating platforms.

  • When NFT contracts are just dealing as registries and marketplaces manage royalty payments individually, how can a collection owner define their royalty scheme so that every marketplace supports it?

EIP-2981

  • This EIP enables all marketplaces to retrieve royalty payment information for a given NFT. This enables accurate royalty payments regardless of which marketplace the NFT is sold or re-sold at.

  • Marketplaces and individuals implement this standard by retrieving the royalty payment information with royaltyInfo()

  • royalty payment must be voluntary, as transfer mechanisms such as transferFrom() include NFT transfers between wallets, and executing them does not always imply a sale occurred.

Implementations

Royalty Registry

  • The need for this registry is due to the enormous number of NFTs that have already been minted without any royalty information on-chain (aka pre-EIP2981).

  • Deploying a royalty registry means that royalty information from NFTs that were created both pre and post-EIP2981, can be stored and retrieved from a single, data store, using well-defined interfaces.

  • Typical usage of the Royalty Registry would be via a new to the registry's smart contracts

  • the message call requests the royalty information of a given NFT, identified through the usage of its token ID and contract address

  • getRoyaltyView //view function

New NFTs - embed royalty info

  • import ERC721, ERC2981

ERC-721
ERC-1155
message call
https://www.superlunar.com/post/a-guide-to-nft-royalties-how-they-work-and-why-they-matter
https://github.com/trufflesuite/unleashed_royalty_standard/blob/main/contracts/RoyalPets.sol
https://trufflesuite.com/guides/nft-royalty/