ERC721 vs ERC20

The ERC 721 standard would be a superior solution here for such synthetic:

· Tokens are purchased at different prices on the same product e.g. User A buys sySPY for $100 and User B buys sySPY for $123.

· Thus, there are multiple copies, sySPY. Which gets sent around the blockchain. User A sells to User C. C comes back to redeem / burn & close position.

· Hlayer is aware A bought 10 versions of sySPY for 123. But has no identifiable information on token itself, Synfy does not know what C is coming back with and at what price. (assume if ERC20 used)

· One would have to modify the ERC20 data structure, changing ERC20 standard itself – to something that does not necessarily comply to ERC20.

· However, using the ERC721 TokenURI, such information can be minted into the token.

· ERC721 also allows other providers to integrate such tokens into 3rd party marketplaces and quote price of this token - via the metadata, if a given user wants to resell the current return.