Nano version‑20 ledger schema change: evaluating safe rollback feasibility
Goal: assess whether a Nano node can safely revert to the pre‑v20 ledger schema after it has processed version‑20 blocks without causing chain divergence or exposing funds to loss. Constraints: the version‑20 upgrade is designed as a forward‑only change; older software rejects the new block format, and no automatic rollback procedure is documented. If some n
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