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A ship schematic.
Digital blueprint for construction of a long lost Jumpship. Return this to Holliday, the shipwright in the Tower.
― In-game description

A ship schematic could be brought to Amanda Holliday in the Tower to be exchanged for a random jumpship. Ship schematics could be obtained randomly from Loot Chests, completing Crucible matches, and turning in bounties.

In Destiny: The Taken King, Amanda Holliday began selling these jumpships directly, and the blueprints were made unobtainable.