diff --git a/src/core/KnownTags.ts b/src/core/KnownTags.ts
index 78de6b9..d980963 100644
--- a/src/core/KnownTags.ts
+++ b/src/core/KnownTags.ts
@@ -22,7 +22,8 @@ export const WARP_TAGS = {
   SEQUENCER_OWNER: 'Sequencer-Owner',
   SEQUENCER_MILLIS: 'Sequencer-Mills',
   SEQUENCER_SORT_KEY: 'Sequencer-Sort-Key',
-  SEQUENCER_LAST_SORT_KEY: 'Sequencer-Last-Sort-Key',
+  SEQUENCER_PREV_SORT_KEY: 'Sequencer-Prev-Sort-Key',
+  SEQUENCER_LAST_SORT_KEY: 'Sequencer-Last-Sort-Key', // deprecated
   SEQUENCER_TX_ID: 'Sequencer-Tx-Id',
   SEQUENCER_BLOCK_HEIGHT: 'Sequencer-Block-Height',
   SEQUENCER_BLOCK_ID: 'Sequencer-Block-Id',
diff --git a/src/core/modules/impl/ArweaveGatewayBundledInteractionLoader.ts b/src/core/modules/impl/ArweaveGatewayBundledInteractionLoader.ts
index c513e55..e60ba21 100644
--- a/src/core/modules/impl/ArweaveGatewayBundledInteractionLoader.ts
+++ b/src/core/modules/impl/ArweaveGatewayBundledInteractionLoader.ts
@@ -1,5 +1,5 @@
 import Arweave from 'arweave';
-import { SMART_WEAVE_TAGS } from '../../KnownTags';
+import { SMART_WEAVE_TAGS, WARP_TAGS, WarpTags } from '../../KnownTags';
 import { GQLEdgeInterface, GQLNodeInterface } from '../../../legacy/gqlResult';
 import { Benchmark } from '../../../logging/Benchmark';
 import { LoggerFactory } from '../../../logging/LoggerFactory';
@@ -7,11 +7,10 @@ import { ArweaveWrapper } from '../../../utils/ArweaveWrapper';
 import { GW_TYPE, InteractionsLoader } from '../InteractionsLoader';
 import { InteractionsSorter } from '../InteractionsSorter';
 import { EvaluationOptions } from '../StateEvaluator';
-import { LexicographicalInteractionsSorter } from './LexicographicalInteractionsSorter';
+import { defaultArweaveMs, LexicographicalInteractionsSorter } from './LexicographicalInteractionsSorter';
 import { Warp, WarpEnvironment } from '../../Warp';
 import { Tag } from 'utils/types/arweave-types';
 import { ArweaveGQLTxsFetcher } from './ArweaveGQLTxsFetcher';
-import { WarpTags, WARP_TAGS } from '../../KnownTags';
 import { safeParseInt } from '../../../utils/utils';
 import { VrfPluginFunctions, WarpPlugin } from '../../WarpPlugin';
 import { TagsParser } from './TagsParser';
@@ -40,6 +39,9 @@ export interface GqlReqVariables {
   after?: string;
 }
 
+// a height from which the last sort key value is being set by the sequencer
+const LAST_SORT_KEY_MIN_HEIGHT = 1057409;
+
 export class ArweaveGatewayBundledInteractionLoader implements InteractionsLoader {
   private readonly logger = LoggerFactory.INST.create(ArweaveGatewayBundledInteractionLoader.name);
 
@@ -73,6 +75,10 @@ export class ArweaveGatewayBundledInteractionLoader implements InteractionsLoade
         {
           name: SMART_WEAVE_TAGS.CONTRACT_TX_ID,
           values: [contractId]
+        },
+        {
+          name: WARP_TAGS.SEQUENCER,
+          values: ['RedStone']
         }
       ],
       blockFilter: {
@@ -131,8 +137,21 @@ export class ArweaveGatewayBundledInteractionLoader implements InteractionsLoade
       const prevInteraction = allInteractions[index - 1];
       const nextInteraction = allInteractions[index];
 
-      if (prevInteraction.node.sortKey !== nextInteraction.node.lastSortKey) {
-        throw Error(
+      this.logger.debug(`prev: ${prevInteraction.node.id} | current: ${nextInteraction.node.id}`);
+
+      if (nextInteraction.node.block.height <= LAST_SORT_KEY_MIN_HEIGHT) {
+        return interaction;
+      }
+      if (nextInteraction.node.lastSortKey?.split(',')[1] === defaultArweaveMs) {
+        // cannot verify this one
+        return interaction;
+      }
+
+      if (
+        prevInteraction.node.source === 'redstone-sequencer' &&
+        prevInteraction.node.sortKey !== nextInteraction.node.lastSortKey
+      ) {
+        this.logger.warn(
           `Interaction loading error: interaction ${nextInteraction.node.id} lastSortKey is not pointing on prev interaction ${prevInteraction.node.id}`
         );
       }
@@ -157,20 +176,26 @@ export class ArweaveGatewayBundledInteractionLoader implements InteractionsLoade
 
   private attachSequencerDataToInteraction(interaction: GQLEdgeInterface): GQLEdgeInterface {
     const extractTag = (tagName: WarpTags) => interaction.node.tags.find((tag: Tag) => tag.name === tagName)?.value;
+
+    const sequencerTxId = extractTag(WARP_TAGS.SEQUENCER_TX_ID);
+
     const sequencerOwner = extractTag(WARP_TAGS.SEQUENCER_OWNER);
     const sequencerBlockId = extractTag(WARP_TAGS.SEQUENCER_BLOCK_ID);
     const sequencerBlockHeight = extractTag(WARP_TAGS.SEQUENCER_BLOCK_HEIGHT);
-    const sequencerLastSortKey = extractTag(WARP_TAGS.SEQUENCER_LAST_SORT_KEY);
+    const sequencerLastSortKey =
+      extractTag(WARP_TAGS.SEQUENCER_PREV_SORT_KEY) || extractTag(WARP_TAGS.SEQUENCER_LAST_SORT_KEY);
     const sequencerSortKey = extractTag(WARP_TAGS.SEQUENCER_SORT_KEY);
-    const sequencerTxId = extractTag(WARP_TAGS.SEQUENCER_TX_ID);
     // this field was added in sequencer from 15.03.2023
     const sequencerBlockTimestamp = extractTag(WARP_TAGS.SEQUENCER_BLOCK_TIMESTAMP);
 
+    const parsedBlockHeight = safeParseInt(sequencerBlockHeight);
+
     if (
       !sequencerOwner ||
       !sequencerBlockId ||
       !sequencerBlockHeight ||
-      !sequencerLastSortKey ||
+      // note: old sequencer transactions do not have last sort key set
+      (!sequencerLastSortKey && parsedBlockHeight > LAST_SORT_KEY_MIN_HEIGHT) ||
       !sequencerTxId ||
       !sequencerSortKey
     ) {
diff --git a/src/core/modules/impl/LexicographicalInteractionsSorter.ts b/src/core/modules/impl/LexicographicalInteractionsSorter.ts
index 2463be3..1ffcfae 100644
--- a/src/core/modules/impl/LexicographicalInteractionsSorter.ts
+++ b/src/core/modules/impl/LexicographicalInteractionsSorter.ts
@@ -7,7 +7,7 @@ import { InteractionsSorter } from '../InteractionsSorter';
 // note: this (i.e. padding to 13 digits) should be safe between years ~1966 and ~2286
 const firstSortKeyMs = ''.padEnd(13, '0');
 const lastSortKeyMs = ''.padEnd(13, '9');
-const defaultArweaveMs = ''.padEnd(13, '0');
+export const defaultArweaveMs = ''.padEnd(13, '0');
 
 export const sortingFirst = ''.padEnd(64, '0');
 export const sortingLast = ''.padEnd(64, 'z');
diff --git a/tools/stamp_state.ts b/tools/stamp_state.ts
new file mode 100644
index 0000000..7829d7d
--- /dev/null
+++ b/tools/stamp_state.ts
@@ -0,0 +1,47 @@
+/* eslint-disable */
+import Arweave from 'arweave';
+import {
+  ArweaveGatewayBundledContractDefinitionLoader,
+  ArweaveGatewayBundledInteractionLoader,
+  defaultCacheOptions,
+  WarpFactory
+} from '../src';
+
+const arweave = Arweave.init({
+  host: 'arweave.net',
+  port: 443,
+  protocol: 'https',
+  timeout: 200000
+});
+
+const arContractLoader = new ArweaveGatewayBundledContractDefinitionLoader('mainnet');
+const arInteractionLoader = new ArweaveGatewayBundledInteractionLoader(arweave, 'mainnet');
+const contractId = 'TlqASNDLA1Uh8yFiH-BzR_1FDag4s735F3PoUFEv2Mo';
+const warp = WarpFactory.custom(
+  arweave,
+  {
+    ...defaultCacheOptions,
+    inMemory: true
+  },
+  'mainnet'
+)
+  .useArweaveGateway()
+  .setInteractionsLoader(arInteractionLoader)
+  .setDefinitionLoader(arContractLoader)
+  .build();
+
+const c = warp.contract(contractId).setEvaluationOptions({
+  allowBigInt: true,
+  unsafeClient: 'skip'
+});
+
+async function getState() {
+  try {
+    const { sortKey, cachedValue } = await c.readState();
+    console.log(sortKey, cachedValue.errorMessages, cachedValue.state, cachedValue.validity);
+  } catch (error) {
+    console.log('readState error:', error, 'contractId:', contractId);
+  }
+}
+
+getState();
diff --git a/tools/wallet.js b/tools/wallet.js
new file mode 100644
index 0000000..3e3d59e
--- /dev/null
+++ b/tools/wallet.js
@@ -0,0 +1,14 @@
+const Arweave = require("arweave");
+
+const arweave = Arweave.init({
+  host: "arweave.net",
+  port: 443,
+  protocol: "https",
+});
+const wallet = arweave.wallets.generate()
+  .then(w => {
+    arweave.wallets.jwkToAddress(w).then((address) => {
+      console.log(address);
+      //1seRanklLU_1VTGkEk7P0xAwMJfA7owA1JHW5KyZKlY
+    });
+  });