# Error Types - Verification Matrix

| Req ID | Requirement | Verification Method | Test File(s) | Status |
|--------|-------------|-------------------|--------------|--------|
| ERR-001 | BlockStoreError MUST define all 13 specified variants (including EmptyReorgChain and PipelineClosed) and derive thiserror::Error + Debug | Unit test: construct each variant, assert Debug output, assert Error trait is implemented | `tests/err_001_tests.rs` | Done |
| ERR-002 | From conversions for RocksDb, Serialization, and Compression errors | Unit test: convert rocksdb::Error, bincode error, and zstd error into BlockStoreError, assert correct variant | `tests/err_002_tests.rs` | Done |
| ERR-003 | All variants produce meaningful Display messages with context | Unit test: construct each variant with known values, assert Display output contains expected context strings | `tests/err_003_tests.rs` | Done |
