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ValidatorCtx e pk addr id proof value ctx sig hash stTxId (Publication hash addr)\n+    => HasReview    e PublicationValidationError\n+    => IdStorage                                          stTxId PublicationTxTypeId\n+    => HasKeyValue  id value (PublicationsOf  addr) (LastPublication hash)\n+    => HasKeyValue  id value (PublicationHead hash) (PublicationNext hash)\n+    => Validator    e         id proof value ctx\n+\n+validatePublication = mkValidator ty\n+    [preValidatePublication @e @pk @addr @id @proof @value @ctx @sig @hash @stTxId]\n+  where\n+    ty = StateTxType $ getId (Proxy @stTxId) PublicationTxTypeId\n+\n+preValidatePublication\n+    :: forall       e pk addr id proof value ctx sig hash stTxId\n+    .  ValidatorCtx e pk addr id proof value ctx sig hash stTxId (Publication hash addr)\n+    => HasKeyValue  id value (PublicationsOf  addr) (LastPublication hash)\n+    => HasKeyValue  id value (PublicationHead hash) (PublicationNext hash)\n+    => HasReview    e PublicationValidationError\n+    => PreValidator e         id proof value ctx\n+preValidatePublication =\n+    PreValidator $ \\_trans@ StateTx {..} -> do\n+\n+        -- Retrieving our Publication payload from proof\n+        (AccountId authorId, _, Publication {..}) <- authenticate\n+            @e @pk @addr @id @proof @value @ctx @sig @hash @stTxId\n+            @(Publication hash addr)\n+            txProof\n+\n+        -- Checking that prevBlockHash matches the one from storage.\n+        -- This can be written as:\n+        --\n+        -- res <- queryOne ...\n+        -- validateUnless (getLastPub <$> res == pPrevBlockHash) Pub...\n+        --\n+        -- ... but this shows the intent more clear.\n+        lastPub <- queryOne (PublicationsOf authorId) >>= \\it -> do\n+            () <- case it of\n+                Just (LastPublication theLast) -> do\n+                    check (Just theLast == pPreviousBlockHash) $\n+                        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