Every share should be given a unique identifier and accounted for. If a share is short it should be marked as loaned and short in a public database that is instantly available to the public. It doesn't have to say WHO but a unique identifier for the trader and platform would be nice. An ID that only the owner of the ID could use to make sure the ledger is valid. Another option would be to use blockchain to store shares and put them into the owner's blockchain wallet on the broker.
John Garland Comment On Regulatory Notice 21-19
Every share should be given a unique identifier and accounted for. If a share is short it should be marked as loaned and short in a public database that is instantly available to the public. It doesn't have to say WHO but a unique identifier for the trader and platform would be nice. An ID that only the owner of the ID could use to make sure the ledger is valid. Another option would be to use blockchain to store shares and put them into the owner's blockchain wallet on the broker.