unsigned4_unknown.md is an unsigned book found in a water area trading hall at -928 / 40 / -1424 on the tilder server in the overworld.
Oceantown Trading Hall Directory
Est. 2020
Level 1
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Books, shelves, bells, lanterns
Level 2: Iron
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Armor, weapons, tools
Level 3
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1. Fish, Produce, Baked goods
2. Exit.
Level 4
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Butcher, Fletcher, Leather, Stone, Shepherd, and Cartography
Level 5
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Executive Suite
Authorized Personnel Only