erc721o VS erc721

One of the design choices that was scrapped was the usage of Opium’s very own token standard ERC 721o - a custom flavor of the more notorious ERC721- whose purpose was to allow for the creation of non-fungible derivative portfolios. Nowadays a similar rationale has been implemented by the ERC1155 standard, however the degree of interoperability and easy-to-reason-about clean API that the good-old-fashioned ERC20 provides are simply undefeated. As such, following a long-existing DeFi trend that was first popularized by Uniswap, Opium makes use of a factory pattern that mints ERC20 tokens in a measure proportional to the ownership of LONG/SHORT option positions of their respective owners. However, as the scope of the article is to give enough of a rundown for a developer to get their feet wet with Opium v2, we will postpone a deep dive into the Opium Protocol architecture to a later date. If you have any questions, feel free to drop by on the governance forum!

lool! I use the erc721 repo like every week! It works really well! haha. https://github.com/nibbstack/erc721/ It's so good!

The problem with "buy the NFT to a song" is just that its inherently meaningless, it exists as a transaction of a few bytes on Ethereum on some random smart contract. Digital assets are nothing new, in Eve Online or World of Warcraft items like unique swords or colossal starships are traded for real money. But there is some tangibility to it that gives them that value, there is no such equivalent with NFTs. Its like trading invisible things that serve no other function than trading in and of itself. They don't exist outside of the belief that they do, (a belief structure in the shape of a pyramid I might add).

`ParserError: Source "https://github.com/0xcert/ethereum-erc721/src/contracts/tokens/nf-token-metadata.sol" not found: File import callback not supported`

Using Remix and ERC721 standard contract from 0xcert/ethereum-erc721 I was able to mint an NFT for very cheap. The tutorial I followed can be found here.