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Case study

Destiny 2 build 86657: Sunrise/Dawn reconstruction research report

A dated research report on the Sunrise/Dawn reconstruction of the archived Destiny 2 build 86657 client, which emulates platform sign-on and the examined Bungie service contracts locally and adds reconstructed mission host policy. It records transport, decoding, object creation, presentation and gameplay results separately, and keeps superseded conclusions with their cited sources. It documents the case rather than shipping the runtime implementation or a recovered Bungie backend; playthroughs and native results remain project-reported.

Requirements and limitations

  • The reviewed edition is dated 21 September 2026: 20 chapters, 289 source records (280 Markdown notes, two PDF text extracts and seven source excerpts) and hash inventories of 2,832 implementation files and 336 lanes-archive files. It covers BAP secure services, matchmaking and peer channels, activity replication, package schemas, mission reconstructions, persistence and native hooks for build 86657.20.08.23.1800.d2_rc. The report states that its corpus does not establish Bungie’s complete backend or a general interpreter for original missions.
  • Native work depends on a separately obtained archived Destiny 2 build 86657 client and its game packages; the report neither supplies them nor explains how to obtain them. Game binaries, package payloads, artwork, a manifest database, credentials, personal saves, raw runtime captures and the two supplied PDFs are not published. Several referenced binary fixtures and traces are also absent, which the report names as a limit on independent reproduction from this repository.
  • The described reconstruction runs as a proxy DLL inside the game process, combining Steam platform-interface and sign-on emulation, an embedded service layer, C++ native contracts and Lua or C++ mission definitions. ATTRIBUTION.md names the separate Dawn project as the reconstruction and integration work, building on Sunrise and Sundial research. Its source was collected from a modified worktree based on commit e801e23e, so file hashes rather than that commit identify the captured files; checking the report itself needs only Python and its two bundled scripts.
  • The bundled validation record reports passing checks of report assembly, 1,191 local links, citations, evidence hashes, 37 claim references and selected publication exclusions, with no game or native runtime tests. Its acceptance table records a complete Omega run, accepted sections of other missions and an Eater of Worlds slice that excludes the barrier and Argos fights; Spark live testing, coherent native-world resume and detached camera behavior remain unverified or unimplemented. This collection read the report and evidence metadata without running its scripts, the game or the implementation.
  • No repository-wide license is declared. ATTRIBUTION.md retains Dawn’s GPL-3.0 text for the included source excerpts, credits Sunrise and Sundial contributors, asserts no Bungie endorsement and does not relicense third-party material. The report concerns local reconstruction of an archived build, and states that its security findings are not vulnerability claims against the current online game. It does not document Claude or other AI-assisted decompilation or recreated in-engine assets, and the reviewed sources establish no REA connection.

About this entry

Type
Case study
Category
Independent reconstruction cases
Relationship
Independent reconstruction project
Targets
Game · Protocol

Sources reviewed

The description was reviewed against primary sources. This does not establish runtime testing, security auditing or verified compatibility.

Primary sources

  1. README.md GitHub · isinternets/d2-research · Revision 9a5b58f
  2. REPORT.md GitHub · isinternets/d2-research · Revision 9a5b58f
  3. chapters/01-scope-and-conclusions.md GitHub · isinternets/d2-research · Revision 9a5b58f
  4. chapters/02-research-method.md GitHub · isinternets/d2-research · Revision 9a5b58f
  5. chapters/03-system-and-identities.md GitHub · isinternets/d2-research · Revision 9a5b58f
  6. chapters/17-security-engineering-findings.md GitHub · isinternets/d2-research · Revision 9a5b58f
  7. chapters/19-reproducibility-and-open-questions.md GitHub · isinternets/d2-research · Revision 9a5b58f
  8. COLLECTION.md GitHub · isinternets/d2-research · Revision 9a5b58f
  9. ATTRIBUTION.md GitHub · isinternets/d2-research · Revision 9a5b58f
  10. evidence/README.md GitHub · isinternets/d2-research · Revision 9a5b58f
  11. evidence/validation.json GitHub · isinternets/d2-research · Revision 9a5b58f
  12. CITATION.cff GitHub · isinternets/d2-research · Revision 9a5b58f
  13. LICENSES/Dawn-GPL-3.0.txt GitHub · isinternets/d2-research · Revision 9a5b58f