LS_APCM — Deterministic Private Constraint Matching for Substrate

applications/logic-sieve-apcm.md

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+---
+project_name: LS_APCM
+amount_requested: 30000 USD
+applicant: Ilyosjon Isamuxamedov
+email: apcm.core@gmail.com
+license: MIT
+repository: https://github.com/lspsifoundation/logic-sieve-apcm
+
+---
+
+# LS_APCM — Deterministic Private Constraint Matching for Substrate
+
+## Summary
+
+LS_APCM explores whether deterministic private constraint verification can be executed inside a Substrate runtime under strict memory and Weight constraints.
+
+The project evaluates if a bounded, `no_std`-compatible primitive can perform private eligibility checks (returning a single verification bit) without introducing non-determinism or intermediate data leakage.
+
+The outcome will provide empirical evidence on whether such functionality can safely be considered for future Substrate-native primitives.
+
+---
+
+## Product Context
+
+Substrate runtimes currently lack native support for private eligibility verification without revealing underlying attributes.
+
+If feasible, LS_APCM enables:
+
+- Runtime-level gated dispatchables
+- Private governance participation checks
+- Compliance-aware logic inside pallets
+- Deterministic eligibility validation without trusted oracles
+
+The deliverable is not a standalone application, but a reusable runtime engineering primitive intended for integration by Substrate developers.
+
+---
+
+## Problem Statement
+
+Substrate requires deterministic execution and bounded resource consumption. Existing private verification mechanisms:
+
+- Depend on trusted intermediaries
+- Rely on heavy cryptographic systems incompatible with strict `no_std`
+- Introduce unpredictable Weight behavior
+
+There is currently no deterministic runtime-level primitive that:
+
+- Returns only a single verification bit
+- Avoids heap allocation
+- Guarantees bounded execution cost
+- Preserves runtime determinism
+
+---
+
+## Proposed Solution
+
+LS_APCM implements a deterministic primitive:
+
+`V(C, R) ∈ {0, 1}`
+
+
+Where:
+
+- `C` = normalized constraint sketch
+- `R` = normalized reference sketch
+
+### Design Constraints
+
+- Sketch size: `S = 256 bits`
+- OT batch size: `256`
+- No heap allocation
+- `no_std` compatible
+- Symmetric cryptographic primitives only
+- All parameters compile-time constants
+
+---
+
+## Determinism Definition
+
+Execution is deterministic if, for identical inputs across ≥ 3 independent nodes:
+
+- Output bit identical
+- Storage state identical
+- Event log identical
+- State root identical
+
+---
+
+## Performance Bound
+
+Let:
+
+`TargetBlockWeight` = configured maximum block Weight of the runtime at evaluation time.
+
+`W` = worst-case Weight of `verify_and_execute` over all valid `(C, R)` pairs.
+
+Valid input space:
+
+- `|C| = S`
+- `|R| = S`
+- Fixed proof size
+- Format-valid inputs only
+
+Success condition:
+
+`W <= 0.01 * TargetBlockWeight`
+
+
+
+Measured using the Substrate benchmarking framework.
+
+Worst-case defined as maximum observed `W` across bounded valid input space.
+
+---
+
+## Threat Model
+
+Adversary model: semi-honest.
+
+Observable:
+
+- Output bit
+- Storage state
+- Event logs
+
+Intermediate value:
+
+Any byte sequence derived from sketch or OT transcript not equal to input or output bit.
+
+Security objective:
+
+No intermediate value appears in:
+
+- Storage
+- Event logs
+- Return data
+
+Excluded from scope:
+
+- Malicious runtime modification
+- Hardware side-channel attacks
+- Validator collusion
+
+---
+
+## Deliverables
+
+### Milestone 1 — Core Primitive ($10,000)
+
+- `no_std` Rust crate (public repository)
+- ≥ 1,000,000 fuzz test inputs
+- Benchmark report with measured `W`
+- Determinism test suite
+
+Acceptance:
+
+- No panic under fuzzing
+- Determinism across ≥ 3 nodes
+- `W <= 0.01 * TargetBlockWeight`
+
+---
+
+### Milestone 2 — Substrate Integration ($10,000)
+
+- `pallet-ls-apcm`
+- Dispatchable `verify_and_execute`
+- Integration tests
+- Multi-node reproducibility log
+
+Execution success if:
+
+- If `V = 1` → predefined storage mutation occurs
+- If `V = 0` → no storage mutation occurs and execution aborts
+- Identical state root across ≥ 3 nodes
+
+---
+
+### Milestone 3 — Research Artifacts ($10,000)
+
+- Technical audit review document
+- Public integration report
+- Benchmark logs
+- Reproducibility logs
+
+---
+
+## Timeline
+
+- Milestone 1: 6 weeks
+- Milestone 2: 4 weeks
+- Milestone 3: 2 weeks
+
+Total estimated duration: 12 weeks
+
+
+## Team & Execution Plan
+
+### Applicant
+
+Ilyosjon Isamuxamedov  
+LinkedIn: https://www.linkedin.com/in/ilyosjon-isamuxamedov-756019307/
+
+Responsibilities:
+
+- Primitive implementation
+- Substrate pallet integration
+- Fuzz testing
+- Benchmarking
+- Determinism validation
+- Documentation and reporting
+
+Execution model:
+
+- Public repository from project start
+- CI pipeline with deterministic test validation
+- Milestone-based development
+- Continuous benchmarking verification
+
+---
+
+## Maintenance Plan
+
+The project is licensed under MIT.
+
+The applicant commits to:
+
+- Maintaining the repository for at least 12 months after completion
+- Addressing critical bugs
+- Reviewing external pull requests
+- Maintaining compatibility with current Substrate stable releases
+
+Future evolution depends on ecosystem adoption.
+
+---
+
+## Risks and Mitigations
+
+**Information leakage**  
+Failure: intermediate value detected in storage, events, or return data.  
+Mitigation: static inspection + storage diff validation.
+
+**Non-determinism**  
+Failure: differing state root or output across nodes.  
+Mitigation: cross-node validation test suite.
+
+**Approximation error**  
+Failure: false positive or false negative detected during adversarial evaluation.  
+Mitigation: adversarial dataset testing and publication of results.
+
+**Weight overflow**  
+Failure: `W > 0.01 * TargetBlockWeight`.  
+Mitigation: automatic No-Go declaration.
+
+---
+
+## Budget Logic
+
+Total requested: $30,000.
+
+Milestone-based release:
+
+- $10,000 — Milestone 1
+- $10,000 — Milestone 2
+- $10,000 — Milestone 3
+
+Release strictly conditioned on measurable acceptance criteria.
+
+---
+
+## Metrics of Success
+
+- Deterministic execution confirmed across ≥ 3 nodes
+- `W <= 0.01 * TargetBlockWeight`
+- Public reproducibility logs
+- Public benchmark data
+- Formal Go / No-Go feasibility conclusion
+
+---
+
+## GO / NO-GO Conditions
+
+No-Go if:
+
+- Leakage detected
+- Non-determinism observed
+- `W > 0.01 * TargetBlockWeight`
+
+In case of No-Go:
+
+- Public technical report
+- All benchmark data disclosed
+- Formal notification to grantor