Updates
StarkEx Spot Trading 4.5
Unique minting
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Each new-minted ERC-721 token is unique.
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The hash of the minted asset is stored in the orders tree
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As part of this change, the StarkEx 4.5 order tree has changed from a Merkle tree into a Patricia tree. So during the upgrade to StarkEx 4.5, the orders root must change. As a result, the upgrade causes 0 time delay on the contract.