[TestNet] Non Fungible Ticket

[madrazzl3]

Description:

Extends the NonFungibleToken contract with methods for preventing transfer of used tickets:

• bool IsUsed(UInt256 tokenId)
• void MarkAsUsed(UInt256 tokenId)

It's different from #82

Compiler Version

v2.0.0

Contract Hash

0a42a2b8a47e1aaac340e141700d146043e3e0d4bcceb9160994b962f4831ca2

Contract Byte Code

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[YakupIpek]

We should make some research about ticketing and how it is done in other chains. If there is currently any ERC standard then we should consider it to use.

Big issue i see on current design is, it changes current NFT implementation with none-standard methods for public usage. That means current NFTs are not going to compatible with these changes. Also we break standard implementation of the NFT.

My recommendation would be

Design another contract which you can transfer NFT and the contract can mark NFT as used then the contract send asset to destination address. The app can track logs of that contract.

I followed such design on some other sale NFT contracts. Here is NFTStore contract example.

When NFT ticket is placed for sale then you transfer ticket to Ticket contract address. Ticket contract is going to be notified by its OnNonFungibleTokenReceived method already by NFT Contract after it is transferred. OnNonFungibleTokenReceived method takes the parameter about which token transferred and by who. Also it takes another byte[] parameter which you can transfer extra data.

CirrusSmartContracts/Testnet/NFTStore/NFTStore/NFTStore.cs

Line 76 in 2e017e5

public bool OnNonFungibleTokenReceived(Address operatorAddress, Address fromAddress, UInt256 tokenId, byte[] data)

In here you can see that SafeTransferFrom is able to carry extra data to another contract.

CirrusSmartContracts/Testnet/NonFungibleToken/NonFungibleToken/NonFungibleToken.cs

Line 186 in 2e017e5

public void SafeTransferFrom(Address from, Address to, UInt256 tokenId, byte[] data)

CirrusSmartContracts/Testnet/NonFungibleToken/NonFungibleToken/NonFungibleToken.cs

Line 370 in 2e017e5

EnsureContractReceivedToken(from, to, tokenId, data);

In this way you can mark NFT tickets as used in Ticketing contract and read the logs.

I can give more details but let me know your opinion on this @madrazzl3 @fenix2222

[YakupIpek]

Just remove This from here and others.

[YakupIpek]

I left some more reviews and approved. You can merge after reviews.

[StratisIain]

Contract has been whitelisted on CirrusTest