If the recipient of the Trophy chooses to burn it, there is no other effect. He does not unlock and does not gain the four blood.
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Trophy: Chosen
Master. Trophy.
When this card is moved to a vampire, that vampire gains 4 blood, becomes Sabbat and unlocks, or that vampire can choose to burn this card instead. The vampire with this card is Black Hand. If he or she was already Black Hand when receiving this card, he or she is a Seraph.
Rulings
Black Hand is not a title, it is a trait unrelated to any sect. The trait is not lost if the vampire changes sect.