Ownership in this case is a NFT (EIP-721, a smart contact standard for non fungible (unique and single ownership) tokens) on the L2 Matic sidechain for Ethereum

Ownership in this case is a NFT (EIP-721, a smart contact standard for non fungible (unique and single ownership) tokens) on the L2 Matic sidechain for Ethereum return the public key to your public-private keypair. Duplicating the token means creating an exact bitwise duplicate of the NFT on the Matic sidechain, which the Ethereum Virtual Machine will not allow. There is no hash to send to someone else and unless there is an exploit in the EVM the NFT can only be owned by one person. To be clear these NFTs only has the meaning of "signed tweet" because people decide it does. If you copied their smart contact and launched your own exact replica Jack could verify on your platform and a new and different NFT would be minted with the same "accepted representation".