TSUNAGI Roadmap

The foundational phase established the core architecture: a deterministic Cardano node written entirely in Zig, capable of following the chain, maintaining a live UTxO set, and verifying its own ledger transitions at runtime.

• Zig-only architecture — Single static binary with two external library dependencies (LMDB, libsodium). No runtime interpreter, garbage collector, or dynamic framework.
• Deterministic ledger pipeline — Modular state machine separating delta extraction, state application, undo management, and pipeline orchestration into independently testable components.
• Shadow ledger verification — Independent memory-only pipeline instance processing identical deltas on every block, with per-block undo-depth parity checking.
• Replay harness — Offline execution driver for recorded block sequences, enabling deterministic regression testing and cross-build verification.
• Preview network validation — Zero shadow mismatches, zero apply errors, and zero rollback errors across all sessions.

The persistence phase connected the deterministic pipeline to durable storage, enabling the node to retain UTxO state across restarts and bootstrap from pre-computed snapshots.

• LMDB truth mode — Three-stage persistence: preflight scan, atomic LMDB write, automatic memory fallback with shadow-write convergence. Three operational modes (memory_only, lmdb_truth, lmdb_native).
• Snapshot bootstrap system — TSF2 format with Blake2b-256 integrity digest and Ed25519 signature attestation.
• State digest verification — CLI command for Blake2b-256 digest over the complete LMDB UTxO set.
• Preflight coverage diagnostics — Read-only LMDB scan counting consumed inputs present before write transactions are opened.
• Storage reliability — Transaction abort on write failure, shadow-write convergence, bounded undo stack with correct memory reclamation.

The observability phase embedded structured health evaluation, integrity verification, and automated stabilization directly into the node binary.

• KAGAMI diagnostics — JSON health snapshots, human-readable reports, and continuous telemetry streams.
• YAMORI guardian monitor — Seven structured checks with event memory and safe-mode engagement.
• TATE fragment defense — Fragment ancestry verification, coverage evaluation, and operator recommendations.
• KURA stabilization layer — Automated artifact maintenance with retention policy enforcement.
• BAEY self-healing loop — Build-Analyze-Evolve-Yield operational cycle.