PHASE-C2-CHARTER.md Project: XSTRP (XRP Safe Transfer & Recovery Protocol) Phase: C2 — Interface & Integration Planning
- Phase Status
Phase C2 is ACTIVE (Planning-Only) Phase C1 remains COMPLETE, FROZEN, and IMMUTABLE.
No Phase C1 artifacts may be modified, reinterpreted, or superseded.
- Phase Purpose
The sole purpose of Phase C2 is to define safe, explicit extension boundaries around the frozen XSTRP core.
Phase C2 exists to answer how XSTRP could be connected to external systems without:
altering protocol logic,
weakening safety guarantees, or
introducing enforcement assumptions.
This phase prepares interfaces, not implementations.
- Scope of Allowed Work
Phase C2 MAY include:
📄 Documentation
Interface descriptions
Integration scenarios (non-binding)
Architectural diagrams (non-normative)
🧩 Rust trait definitions only
No logic
No state mutation
No side effects
🧪 Compile-time checks
Trait bounds
Type-level constraints
📝 Threat-surface analysis for hypothetical integrations
All changes must be additive.
- Explicit Non-Goals
Phase C2 MUST NOT include:
❌ Any modification to RFC-XSTRP-0001
❌ Any modification to Phase C1 Rust code
❌ XRPL integration of any kind
❌ Cryptographic primitives or signing
❌ Networking, transport, or messaging layers
❌ Persistence or storage implementations
❌ Enforcement of IntentBinding
❌ Runtime logic, handlers, or adapters
❌ “Just a stub” implementations
If logic executes, Phase C2 has been violated.
- Interface Philosophy
All Phase C2 interfaces must be:
Purely declarative
Opt-in
Externally supplied
Protocol-agnostic
Non-authoritative
XSTRP core remains the only source of truth for intent state transitions.
- Safety Invariants (Inherited from Phase C1)
Phase C2 must not introduce any mechanism that:
Enables fund release without receiver participation
Enables sender redirection after intent creation
Allows third-party seizure or coercion
Creates a stranded-fund state
Weakens deterministic state transitions
If an interface could violate these, it must be rejected or redesigned.
- Exit Criteria
Phase C2 may be considered complete when:
All intended interfaces are documented
All Rust traits compile
No runtime logic exists
No Phase C1 files were altered
A new freeze declaration is written (PHASE-C2-FROZEN.md)
- Freeze Conditions
Phase C2 MUST be frozen immediately if:
Implementation pressure appears
External systems begin dictating design
Safety invariants are questioned
Scope creep occurs
The beginner-pace constraint is threatened
Freeze is always preferred over progress.
- Developer Constraints (Still Enforced)
Beginner pace
Safety > features
Additive changes only
Explicit phase boundaries
No silent scope creep
No urgency bias
- Authority
This charter governs all Phase C2 work. Any deviation requires an explicit, written amendment before action.
Phase C2 Charter — Adopted Status: ACTIVE (Planning-Only)