Transfer Validation

Off-chain order books should be aware of the transfer security level setting (see Transfer Security) for each collection they provide listing services for and apply filtering logic to hide listings that are unfillable.

Situations where an off-chain order book will need to filter listings due to changes in transfer validation settings include:

• No EOA Validation to EOA Validation
  • Security Level At Offer Creation: Recommended, 1, 2, 3, 4, 5, or 7
  • New Security Level: 6 or 8
  • Affected Orders: Offers by a maker where the beneficiary is not a verified EOA.
  • Action: Offer should be hidden until the beneficiary performs the EOA Verification process.
  • Notification: Order book should notify the maker that they have orders that are unfillable pending action.
• Smart Contract Receivers Allowed to Blocked
  • Security Level At Offer Creation: Recommended, 1, 2, 3, 4
  • New Security Level: 5 or 7
  • Affected Orders: Offers by a maker where the beneficiary has contract code.
  • Action: Offer should be hidden.
  • Notification: Order book should notify the maker that they have orders that are unfillable due to collection security settings.
• Marketplace Contract Removed from Whitelist
  • Security Level: Recommended, 3, 4, 5, 6, 7, 8
  • Affected Orders: All orders for collections using the whitelist the marketplace contract was removed from.
  • Action: Orders should be hidden.
  • Notification: Order book should notify makers that they have orders that are unfillable due to collection security settings.
  • Note: This situation may occur when a marketplace contract is removed from a whitelist by the list owner or when a collection changes to a list that does not include the marketplace contract in its whitelist.
• Marketplace Contract Added to Blacklist
  • Security Level: 2
  • Affected Orders: All orders for collections using the blacklist the marketplace contract was added to.
  • Action: Orders should be hidden.
  • Notification: Order book should notify makers that they have orders that are unfillable due to collection security settings.
  • Note: This situation may occur when a marketplace contract is added to a blacklist by the list owner or when a collection changes to a list that includes the marketplace contract in its blacklist.
• No List or Blacklist to Whitelist, Marketplace Contract Not On Whitelist
  • Security Level At Order Creation: 1, 2
  • New Security Level: Recommended, 3, 4, 5, 6, 7, 8
  • Affected Orders: All orders for the collection using the marketplace contract.
  • Action: Orders should be hidden.
  • Notification: Order book should notify makers that they have orders that are unfillable due to collection security settings.
• No List or Whitelist to Blacklist, Marketplace Contract On Blacklist
  • Security Level At Order Creation: Recommended, 1, 3, 4, 5, 6, 7, 8
  • New Security Level: 2
  • Affected Orders: All orders for the collection using the marketplace contract.
  • Action: Orders should be hidden.
  • Notification: Order book should notify makers that they have orders that are unfillable due to collection security settings.