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In the United States and Canada, a medallion signature guarantee is a special signature guarantee for the transfer of securities. It is a guarantee by the transferring financial institution that the signature is genuine and the financial institution accepts liability for any forgery. Signature guarantees protect shareholders by preventing unauthorized transfers and possible investor losses.
We live in the world we live in, and the signature guarantee stuff sucks but it is there. (And make sure Treasury Direct really will accept a plain old signature guarantee, that may be good enough for adding a bank account but the last time I actually transferred assets they wanted the full-bore medallion deal).