Nix

https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.3.1

npm install --save-dev @nomiclabs/hardhat-truffle5 @nomiclabs/hardhat-web3 web3

https://docs.openzeppelin.com/test-helpers/0.5/

npm install --save-dev @openzeppelin/test-helpers

https://github.com/manifoldxyz/royalty-registry-solidity

https://royaltyregistry.xyz/lookup

Engine@Mainnet 0x0385603ab55642cb4Dd5De3aE9e306809991804f

WETH9 https://ropsten.etherscan.io/address/0xd0000de5a8a759ead912f89d2e6f1ae59063a61a#code

Deployed WETH9 v0.4.19+commit.c4cbbb05 no optimisation to 0xD0000DE5A8A759EAD912F89d2E6f1ae59063a61A on the following Ethereum testnets:

• Ropsten
• Kovan
• Rinkeby
• Goerli
• xDai

Royalty Registry https://rinkeby.etherscan.io/address/0xc9198CbbB57708CF31e0caBCe963c98e60d333c3

Royalty Engine https://rinkeby.etherscan.io/address/0x8d17687ea9a6bb6efA24ec11DcFab01661b2ddcd

https://royaltyregistry.xyz/lookup

• Rinkeby

You can view your Rinkeby "TestToadz" and Goerli "TestToads V2" in https://testnets.opensea.io/account.

• Rinkeby

Nix https://rinkeby.etherscan.io/address/0x9c4b276d8c6cda3c2e2e6401f4a502c1e15847e9#code

NixHelper https://rinkeby.etherscan.io/address/0x429106bab5981abb59094b9780cb731cf1dc16ad#code

Nix https://rinkeby.etherscan.io/address/0x66fa96804A82034Dd7C44aF5376eEd7207861efd#code

NixHelper https://rinkeby.etherscan.io/address/0x83377ea907a08baC9320cE6330993EcabBB48578#code

Nix https://rinkeby.etherscan.io/address/0xDd26fD59b687269A5672217614BA72dd0ffC6b9f#code

NixHelper https://rinkeby.etherscan.io/address/0x2ce1eeF166373607aa7415D183007fA56E1eB5E2#code

Nix https://rinkeby.etherscan.io/address/0x682b156Cbb16e7F38874B3138F559976593B8629#code

NixHelper https://rinkeby.etherscan.io/address/0x088973C56EB9B5E616A5184b015642e574582c31#code

Nix https://rinkeby.etherscan.io/address/0xB1eb96f752C624DC784D80961A1aCcfAf348C923#code

NixHelper https://rinkeby.etherscan.io/address/0x8aa752009F38F0b1C9306c7da2f9A146E2bAF56b#code