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Artstr-Studio/docs
thePR0M3TH3AN 87dd9426c2 Draft Linked Designs spec
Spec for the next big arc: reference-based cross-design imports.
Adds a `kind: 'linked'` flavor of the existing design layer that
stores only a NIP-01 addressable-event coordinate
(30078:<pubkey>:<dTag>) and resolves to the latest source on
render. Sits alongside the existing embedded import path; user
picks at import time.

Key decisions baked in (per scoping conversation):

- Versioning: always-latest by default, with an opt-in "Pin to
  this version" toggle exposed per linked layer.
- Nesting: up to 3 levels deep with cycle detection + visible
  depth-exceeded placeholders.
- Encrypted: Phase 1 ships public-only; Phase 2 adds premium
  (renders if viewer's unlocked) and private (share-list aware).
- Attribution chain is first-class — host publish emits one
  ['p', '<contributor pubkey>', '<relay-hint>', 'design-contributor']
  tag per distinct linked-tree creator, plus an in-app Credits
  panel surfacing co-creators. Lets larger collaborative projects
  carry honest attribution natively.

Architectural shape:

- Resolver IIFE (linkedDesigns) with session cache, multi-relay
  union (mirrors _vaultRelayUnion), and a manual Refresh button
  to bypass cache.
- renderDesignObjectIntoElement gets a linked branch that calls
  the resolver before the existing render path.
- Layer-options panel exposes pin / refresh / unlink / replace.
- "Publish + link" action converts an embedded layer to a freshly-
  published source + linked reference (Phase 3 polish).
- Convert-back-to-embed action snapshots the current resolution.

Phased implementation:

- Phase 1: Public-only linking, schema, resolver, rendering, UI.
- Phase 2: Premium + private link resolution with access control.
- Phase 3: Disk cache, attribution `p`-tag emission, Credits panel,
  Publish + link workflow.

Acceptance criterion for Phase 1: a public cover design linked into
a public slide deck renders correctly; editing the source updates
the host's render on next refresh. 10-link host event stays under
typical relay size limits.

Outstanding open questions to revisit during implementation:

- Whether the depth limit should be 3 forever or configurable.
- Whether the 256 KB per-source payload cap is the right number.
- Whether to surface "last resolved" times in the layer name itself
  or only on hover.
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