rating: +110+x

Item #: SCP-3549

Object Class: Safe

Special Containment Procedures: SCP-3549 is to be contained within a medium-security storage closet at Site 76. A hard copy of the decrypted text is to be kept alongside SCP-3549 for the convenience of research personnel, with digital copies being kept on secured Foundation servers.

Description: SCP-3549 is the collective designation for 36 related anomalous items, which when used in tandem with each other function as an anomalous method of communication and record keeping.

SCP-3549-A is a collection of 12 vellum codices, dated to the early 15th century1, with "Darke Trading Co." embossed on the cover in gold leaf. Although the vellum comprising the codices has been confirmed to be mammalian, genetic analysis has been unable to confirm a specific species. Several anomalous genes have been found to comprise the vellum's genome, however.

Each instance of SCP-3549-A contains an indeterminate number of pages, and all contain identical text. For the most part, this text consists of a transaction ledger spanning from the 15th to 18th centuries. The text is written in a cypher, which has been decoded by Foundation cryptologists (see document SCP-3549-01 for more details).

SCP-3549-B are a set of 12 identical silver inkwells, also inscribed with the name "Darke Trading Co." The ink held within these wells cannot be exhausted, nor can it be removed except by the insertion of an instance of SCP-3549-C. The ink itself is bluish black and has been confirmed to be squid ink. SCP-3549-C are 12 quills made from the flight feathers of black swans.

Notably, all instances of SCP-3549 are in pristine condition and appear to be anomalously resistant to damage and deterioration.

When an individual writes upon a page in an instance of SCP-3549-A, using an instance of SCP-3549-C with ink from SCP-3549-B, and using the correct cypher, the text will immediately appear within all other instances of SCP-3549. Any marking made upon the pages of SCP-3549 by any other means or not using the cypher will result in the marking vanishing within seconds. This applies to any attempt at editing the text as well. Entries may only be revised or deleted if done so simultaneously in a minimum of 7 instances of SCP-3549-A.

If a transaction is entered which contradicts previously entered data, the transaction will automatically appear as crossed out once the quill has left the paper, indicating that it is invalid. Removing one or more pages from SCP-3549-A will result in the page rapidly putrefying and reappearing the next time the book is opened.

Review of SCP-3549 has revealed that it was originally used to allow multiple members of the Darke Trading Co. to remain immediately up to date on the company's business dealings, allowing for a far greater degree of coordination than was otherwise possible at the time, giving them a significant advantage over their business rivals.

It also appears that, due to the unprecedented security provided by SCP-3549, that authors would assign wholly imaginary marks2 as payment for services rendered to various clients, employees and contractors, who could then redeem them from other ledger keepers for actual products, similar to modern debit cards and cryptocurrencies.

Addendum: SCP-3549 was originally discovered during a raid on an MC&D warehouse in Glasgow, Scotland. It is therefore considered likely that SCP-3549 is a legitimate source of information regarding the Person of Interest known only as Dark, believed to be a founding member and possibly still senior partner of the GoI Marshall, Carter, and Dark.

The following excerpts have been selected as either key or representative samples of this biographical information. The text has been decrypted and, where required, translated or modernized (see document SCP-3549-01 for the full decrypted text).

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