diff --git a/codex/clock.nim b/codex/clock.nim
index 88df94da..f680ddec 100644
--- a/codex/clock.nim
+++ b/codex/clock.nim
@@ -1,6 +1,7 @@
 import pkg/chronos
 import pkg/stew/endians2
 import pkg/upraises
+import pkg/stint
 
 type
   Clock* = ref object of RootObj
@@ -13,6 +14,12 @@ method now*(clock: Clock): SecondsSince1970 {.base, upraises: [].} =
 method waitUntil*(clock: Clock, time: SecondsSince1970) {.base, async.} =
   raiseAssert "not implemented"
 
+method start*(clock: Clock) {.base, async.} =
+  discard
+
+method stop*(clock: Clock) {.base, async.} =
+  discard
+
 proc withTimeout*(future: Future[void],
                   clock: Clock,
                   expiry: SecondsSince1970) {.async.} =
@@ -32,3 +39,6 @@ proc toBytes*(i: SecondsSince1970): seq[byte] =
 proc toSecondsSince1970*(bytes: seq[byte]): SecondsSince1970 =
   let asUint = uint64.fromBytes(bytes)
   cast[int64](asUint)
+
+proc toSecondsSince1970*(bigint: UInt256): SecondsSince1970 =
+  bigint.truncate(int64)
diff --git a/codex/contracts/clock.nim b/codex/contracts/clock.nim
index 7b5187c8..23b678e9 100644
--- a/codex/contracts/clock.nim
+++ b/codex/contracts/clock.nim
@@ -17,7 +17,7 @@ type
 proc new*(_: type OnChainClock, provider: Provider): OnChainClock =
   OnChainClock(provider: provider, newBlock: newAsyncEvent())
 
-proc start*(clock: OnChainClock) {.async.} =
+method start*(clock: OnChainClock) {.async.} =
   if clock.started:
     return
   clock.started = true
@@ -33,7 +33,7 @@ proc start*(clock: OnChainClock) {.async.} =
 
   clock.subscription = await clock.provider.subscribe(onBlock)
 
-proc stop*(clock: OnChainClock) {.async.} =
+method stop*(clock: OnChainClock) {.async.} =
   if not clock.started:
     return
   clock.started = false
diff --git a/codex/contracts/interactions/hostinteractions.nim b/codex/contracts/interactions/hostinteractions.nim
index d563eb9c..bfb9ac9c 100644
--- a/codex/contracts/interactions/hostinteractions.nim
+++ b/codex/contracts/interactions/hostinteractions.nim
@@ -13,7 +13,7 @@ type
 
 proc new*(
     _: type HostInteractions,
-    clock: OnChainClock,
+    clock: Clock,
     sales: Sales
 ): HostInteractions =
   ## Create a new HostInteractions instance
diff --git a/codex/contracts/interactions/interactions.nim b/codex/contracts/interactions/interactions.nim
index 3ad67991..287cf297 100644
--- a/codex/contracts/interactions/interactions.nim
+++ b/codex/contracts/interactions/interactions.nim
@@ -7,7 +7,7 @@ export clock
 
 type
   ContractInteractions* = ref object of RootObj
-    clock*: OnChainClock
+    clock*: Clock
 
 method start*(self: ContractInteractions) {.async, base.} =
   await self.clock.start()
diff --git a/codex/node.nim b/codex/node.nim
index cd77c972..bcb8e58e 100644
--- a/codex/node.nim
+++ b/codex/node.nim
@@ -104,11 +104,28 @@ proc fetchManifest*(
 
   return manifest.success
 
+proc updateExpiry*(node: CodexNodeRef, manifestCid: Cid, expiry: SecondsSince1970): Future[?!void] {.async.} =
+  without manifest =? await node.fetchManifest(manifestCid), error:
+    trace "Unable to fetch manifest for cid", manifestCid
+    return failure(error)
+
+  try:
+      let ensuringFutures = Iter.fromSlice(0..<manifest.blocksCount)
+                               .mapIt(node.blockStore.ensureExpiry( manifest.treeCid, it, expiry ))
+      await allFuturesThrowing(ensuringFutures)
+  except CancelledError as exc:
+    raise exc
+  except CatchableError as exc:
+    return failure(exc.msg)
+
+  return success()
+
 proc fetchBatched*(
   node: CodexNodeRef,
   manifest: Manifest,
   batchSize = FetchBatch,
-  onBatch: BatchProc = nil): Future[?!void] {.async, gcsafe.} =
+  onBatch: BatchProc = nil,
+  expiry = SecondsSince1970.none): Future[?!void] {.async, gcsafe.} =
   ## Fetch manifest in batches of `batchSize`
   ##
 
@@ -127,6 +144,10 @@ proc fetchBatched*(
 
     try:
       await allFuturesThrowing(allFinished(blocks))
+
+      if expiryValue =? expiry:
+        await allFuturesThrowing(blocks.mapIt(node.blockStore.ensureExpiry(it.read.get.cid, expiryValue)))
+
       if not onBatch.isNil:
         await onBatch(blocks.mapIt( it.read.get ))
     except CancelledError as exc:
@@ -419,13 +440,21 @@ proc start*(node: CodexNodeRef) {.async.} =
       # since fetching of blocks will have to be selective according
       # to a combination of parameters, such as node slot position
       # and dataset geometry
-      if fetchErr =? (await node.fetchBatched(manifest, onBatch = onBatch)).errorOption:
+      if fetchErr =? (await node.fetchBatched(manifest, onBatch = onBatch, expiry = some request.expiry.toSecondsSince1970)).errorOption:
         let error = newException(CodexError, "Unable to retrieve blocks")
         error.parent = fetchErr
         return failure(error)
 
       return success()
 
+    hostContracts.sales.onExpiryUpdate = proc(rootCid: string, expiry: SecondsSince1970): Future[?!void] {.async.} =
+      without cid =? Cid.init(rootCid):
+        trace "Unable to parse Cid", cid
+        let error = newException(CodexError, "Unable to parse Cid")
+        return failure(error)
+
+      return await node.updateExpiry(cid, expiry)
+
     hostContracts.sales.onClear = proc(request: StorageRequest,
                                        slotIndex: UInt256) =
       # TODO: remove data from local storage
diff --git a/codex/sales.nim b/codex/sales.nim
index 4db0ed52..b57718a2 100644
--- a/codex/sales.nim
+++ b/codex/sales.nim
@@ -63,6 +63,9 @@ proc `onSale=`*(sales: Sales, callback: OnSale) =
 proc `onProve=`*(sales: Sales, callback: OnProve) =
   sales.context.onProve = some callback
 
+proc `onExpiryUpdate=`*(sales: Sales, callback: OnExpiryUpdate) =
+  sales.context.onExpiryUpdate = some callback
+
 proc onStore*(sales: Sales): ?OnStore = sales.context.onStore
 
 proc onClear*(sales: Sales): ?OnClear = sales.context.onClear
@@ -71,6 +74,8 @@ proc onSale*(sales: Sales): ?OnSale = sales.context.onSale
 
 proc onProve*(sales: Sales): ?OnProve = sales.context.onProve
 
+proc onExpiryUpdate*(sales: Sales): ?OnExpiryUpdate = sales.context.onExpiryUpdate
+
 func new*(_: type Sales,
           market: Market,
           clock: Clock,
diff --git a/codex/sales/salescontext.nim b/codex/sales/salescontext.nim
index a823e78a..a7924ce0 100644
--- a/codex/sales/salescontext.nim
+++ b/codex/sales/salescontext.nim
@@ -17,6 +17,7 @@ type
     onClear*: ?OnClear
     onSale*: ?OnSale
     onProve*: ?OnProve
+    onExpiryUpdate*: ?OnExpiryUpdate
     reservations*: Reservations
     slotQueue*: SlotQueue
     simulateProofFailures*: int
@@ -25,6 +26,7 @@ type
                   slot: UInt256,
                   onBatch: BatchProc): Future[?!void] {.gcsafe, upraises: [].}
   OnProve* = proc(slot: Slot): Future[seq[byte]] {.gcsafe, upraises: [].}
+  OnExpiryUpdate* = proc(rootCid: string, expiry: SecondsSince1970): Future[?!void] {.gcsafe, upraises: [].}
   OnClear* = proc(request: StorageRequest,
                   slotIndex: UInt256) {.gcsafe, upraises: [].}
   OnSale* = proc(request: StorageRequest,
diff --git a/codex/sales/states/filled.nim b/codex/sales/states/filled.nim
index a6803c25..c5bc4c27 100644
--- a/codex/sales/states/filled.nim
+++ b/codex/sales/states/filled.nim
@@ -1,4 +1,5 @@
 import pkg/questionable
+import pkg/questionable/results
 import pkg/chronicles
 import ../../conf
 import ../statemachine
@@ -37,9 +38,18 @@ method run*(state: SaleFilled, machine: Machine): Future[?State] {.async.} =
   if host == me.some:
     info "Slot succesfully filled", requestId = $data.requestId, slotIndex = $data.slotIndex
 
-    if request =? data.request:
-      if onFilled =? agent.onFilled:
-        onFilled(request, data.slotIndex)
+    without request =? data.request:
+      raiseAssert "no sale request"
+
+    if onFilled =? agent.onFilled:
+      onFilled(request, data.slotIndex)
+
+    without onExpiryUpdate =? context.onExpiryUpdate:
+      raiseAssert "onExpiryUpdate callback not set"
+
+    let requestEnd = await market.getRequestEnd(data.requestId)
+    if err =? (await onExpiryUpdate(request.content.cid, requestEnd)).errorOption:
+      return some State(SaleErrored(error: err))
 
     when codex_enable_proof_failures:
       if context.simulateProofFailures > 0:
diff --git a/codex/stores/blockstore.nim b/codex/stores/blockstore.nim
index c58e655f..bb91258a 100644
--- a/codex/stores/blockstore.nim
+++ b/codex/stores/blockstore.nim
@@ -88,6 +88,18 @@ method ensureExpiry*(
 
   raiseAssert("Not implemented!")
 
+method ensureExpiry*(
+    self: BlockStore,
+    treeCid: Cid,
+    index: Natural,
+    expiry: SecondsSince1970
+): Future[?!void] {.base.} =
+  ## Ensure that block's associated expiry is at least given timestamp
+  ## If the current expiry is lower then it is updated to the given one, otherwise it is left intact
+  ##
+
+  raiseAssert("Not implemented!")
+
 method delBlock*(self: BlockStore, cid: Cid): Future[?!void] {.base.} =
   ## Delete a block from the blockstore
   ##
diff --git a/codex/stores/cachestore.nim b/codex/stores/cachestore.nim
index a7acf4ec..13308c7a 100644
--- a/codex/stores/cachestore.nim
+++ b/codex/stores/cachestore.nim
@@ -230,6 +230,17 @@ method ensureExpiry*(
 
   discard # CacheStore does not have notion of TTL
 
+method ensureExpiry*(
+    self: CacheStore,
+    treeCid: Cid,
+    index: Natural,
+    expiry: SecondsSince1970
+): Future[?!void] {.async.} =
+  ## Updates block's associated TTL in store - not applicable for CacheStore
+  ##
+
+  discard # CacheStore does not have notion of TTL
+
 method delBlock*(self: CacheStore, cid: Cid): Future[?!void] {.async.} =
   ## Delete a block from the blockstore
   ##
diff --git a/codex/stores/networkstore.nim b/codex/stores/networkstore.nim
index 16e72b21..eec84611 100644
--- a/codex/stores/networkstore.nim
+++ b/codex/stores/networkstore.nim
@@ -101,13 +101,36 @@ method ensureExpiry*(
   ## If the current expiry is lower then it is updated to the given one, otherwise it is left intact
   ##
 
-  if (await self.localStore.hasBlock(cid)).tryGet:
+  without blockCheck =? await self.localStore.hasBlock(cid), err:
+    return failure(err)
+
+  if blockCheck:
     return await self.localStore.ensureExpiry(cid, expiry)
   else:
     trace "Updating expiry - block not in local store", cid
 
   return success()
 
+method ensureExpiry*(
+    self: NetworkStore,
+    treeCid: Cid,
+    index: Natural,
+    expiry: SecondsSince1970
+): Future[?!void] {.async.} =
+  ## Ensure that block's associated expiry is at least given timestamp
+  ## If the current expiry is lower then it is updated to the given one, otherwise it is left intact
+  ##
+
+  without blockCheck =? await self.localStore.hasBlock(treeCid, index), err:
+    return failure(err)
+
+  if blockCheck:
+    return await self.localStore.ensureExpiry(treeCid, index, expiry)
+  else:
+    trace "Updating expiry - block not in local store", treeCid, index
+
+  return success()
+
 method listBlocks*(
   self: NetworkStore,
   blockType = BlockType.Manifest): Future[?!AsyncIter[?Cid]] =
diff --git a/codex/stores/repostore.nim b/codex/stores/repostore.nim
index 37c54972..db53ae6f 100644
--- a/codex/stores/repostore.nim
+++ b/codex/stores/repostore.nim
@@ -256,7 +256,7 @@ method ensureExpiry*(
       return failure(err)
 
   if expiry <= currentExpiry.toSecondsSince1970:
-    trace "Current expiry is larger then the specified one, no action needed"
+    trace "Current expiry is larger than or equal to the specified one, no action needed", current = currentExpiry.toSecondsSince1970, ensuring = expiry
     return success()
 
   if err =? (await self.metaDs.put(expiryKey, expiry.toBytes)).errorOption:
@@ -265,6 +265,20 @@ method ensureExpiry*(
 
   return success()
 
+method ensureExpiry*(
+    self: RepoStore,
+    treeCid: Cid,
+    index: Natural,
+    expiry: SecondsSince1970
+): Future[?!void] {.async.} =
+  ## Ensure that block's associated expiry is at least given timestamp
+  ## If the current expiry is lower then it is updated to the given one, otherwise it is left intact
+  ##
+  without cidAndProof =? await self.getCidAndProof(treeCid, index), err:
+    return failure(err)
+
+  await self.ensureExpiry(cidAndProof[0], expiry)
+
 proc persistTotalBlocksCount(self: RepoStore): Future[?!void] {.async.} =
   if err =? (await self.metaDs.put(
       CodexTotalBlocksKey,
diff --git a/tests/codex/sales/states/testfilled.nim b/tests/codex/sales/states/testfilled.nim
index 68a1318a..92a004a3 100644
--- a/tests/codex/sales/states/testfilled.nim
+++ b/tests/codex/sales/states/testfilled.nim
@@ -1,4 +1,7 @@
 import pkg/asynctest
+import pkg/questionable/results
+
+import pkg/codex/clock
 import pkg/codex/contracts/requests
 import pkg/codex/sales
 import pkg/codex/sales/salesagent
@@ -7,6 +10,7 @@ import pkg/codex/sales/states/filled
 import pkg/codex/sales/states/errored
 import pkg/codex/sales/states/proving
 import pkg/codex/sales/states/finished
+
 import ../../helpers/mockmarket
 import ../../examples
 import ../../helpers
@@ -20,6 +24,7 @@ checksuite "sales state 'filled'":
   var slot: MockSlot
   var agent: SalesAgent
   var state: SaleFilled
+  var onExpiryUpdatePassedExpiry: SecondsSince1970
 
   setup:
     market = MockMarket.new()
@@ -27,11 +32,18 @@ checksuite "sales state 'filled'":
                     host: Address.example,
                     slotIndex: slotIndex,
                     proof: @[])
-    let context = SalesContext(market: market)
+
+    market.requestEnds[request.id] = 321
+    onExpiryUpdatePassedExpiry = -1
+    let onExpiryUpdate = proc(rootCid: string, expiry: SecondsSince1970): Future[?!void] {.async.} =
+      onExpiryUpdatePassedExpiry = expiry
+      return success()
+    let context = SalesContext(market: market, onExpiryUpdate: some onExpiryUpdate)
+
     agent = newSalesAgent(context,
                           request.id,
                           slotIndex,
-                          StorageRequest.none)
+                          some request)
     state = SaleFilled.new()
 
   test "switches to proving state when slot is filled by me":
@@ -40,6 +52,16 @@ checksuite "sales state 'filled'":
     let next = await state.run(agent)
     check !next of SaleProving
 
+  test "calls onExpiryUpdate with request end":
+    slot.host = await market.getSigner()
+    market.filled = @[slot]
+
+    let expectedExpiry = 123
+    market.requestEnds[request.id] = expectedExpiry
+    let next = await state.run(agent)
+    check !next of SaleProving
+    check onExpiryUpdatePassedExpiry == expectedExpiry
+
   test "switches to error state when slot is filled by another host":
     slot.host = Address.example
     market.filled = @[slot]
diff --git a/tests/codex/sales/testsales.nim b/tests/codex/sales/testsales.nim
index 9827a357..c49dc613 100644
--- a/tests/codex/sales/testsales.nim
+++ b/tests/codex/sales/testsales.nim
@@ -59,6 +59,10 @@ asyncchecksuite "Sales - start":
                          slot: UInt256,
                          onBatch: BatchProc): Future[?!void] {.async.} =
       return success()
+
+    sales.onExpiryUpdate = proc(rootCid: string, expiry: SecondsSince1970): Future[?!void] {.async.} =
+      return success()
+
     queue = sales.context.slotQueue
     sales.onProve = proc(slot: Slot): Future[seq[byte]] {.async.} =
       return proof
@@ -157,6 +161,10 @@ asyncchecksuite "Sales":
                          slot: UInt256,
                          onBatch: BatchProc): Future[?!void] {.async.} =
       return success()
+
+    sales.onExpiryUpdate = proc(rootCid: string, expiry: SecondsSince1970): Future[?!void] {.async.} =
+      return success()
+
     queue = sales.context.slotQueue
     sales.onProve = proc(slot: Slot): Future[seq[byte]] {.async.} =
       return proof
diff --git a/tests/codex/testnode.nim b/tests/codex/testnode.nim
index 57e52558..19a25e20 100644
--- a/tests/codex/testnode.nim
+++ b/tests/codex/testnode.nim
@@ -6,11 +6,17 @@ import pkg/asynctest
 import pkg/chronos
 import pkg/chronicles
 import pkg/stew/byteutils
+import pkg/datastore
+import pkg/questionable
+import pkg/stint
 
 import pkg/nitro
 import pkg/codexdht/discv5/protocol as discv5
 
 import pkg/codex/stores
+import pkg/codex/clock
+import pkg/codex/contracts
+import pkg/codex/systemclock
 import pkg/codex/blockexchange
 import pkg/codex/chunker
 import pkg/codex/node
@@ -18,7 +24,10 @@ import pkg/codex/manifest
 import pkg/codex/discovery
 import pkg/codex/blocktype as bt
 
+import ../examples
 import ./helpers
+import ./helpers/mockmarket
+import ./helpers/mockclock
 
 asyncchecksuite "Test Node":
   let
@@ -30,7 +39,10 @@ asyncchecksuite "Test Node":
     switch: Switch
     wallet: WalletRef
     network: BlockExcNetwork
-    localStore: CacheStore
+    clock: Clock
+    localStore: RepoStore
+    localStoreRepoDs: DataStore
+    localStoreMetaDs: DataStore
     engine: BlockExcEngine
     store: NetworkStore
     node: CodexNodeRef
@@ -69,7 +81,13 @@ asyncchecksuite "Test Node":
     switch = newStandardSwitch()
     wallet = WalletRef.new(EthPrivateKey.random())
     network = BlockExcNetwork.new(switch)
-    localStore = CacheStore.new()
+
+    clock = SystemClock.new()
+    localStoreMetaDs = SQLiteDatastore.new(Memory).tryGet()
+    localStoreRepoDs = SQLiteDatastore.new(Memory).tryGet()
+    localStore = RepoStore.new(localStoreRepoDs, localStoreMetaDs, clock=clock)
+    await localStore.start()
+
     blockDiscovery = Discovery.new(
       switch.peerInfo.privateKey,
       announceAddrs = @[MultiAddress.init("/ip4/127.0.0.1/tcp/0")
@@ -105,8 +123,7 @@ asyncchecksuite "Test Node":
       fetched == manifest
 
   test "Block Batching":
-    let
-      manifest = await Manifest.fetch(chunker)
+    let manifest = await Manifest.fetch(chunker)
 
     for batchSize in 1..12:
       (await node.fetchBatched(
@@ -116,6 +133,21 @@ asyncchecksuite "Test Node":
           check blocks.len > 0 and blocks.len <= batchSize
       )).tryGet()
 
+  test "Block Batching with expiry":
+    let
+      manifest = await Manifest.fetch(chunker)
+      # The blocks have set default TTL, so in order to update it we have to have larger TTL
+      expectedExpiry: SecondsSince1970 = clock.now + DefaultBlockTtl.seconds + 123
+
+    (await node.fetchBatched(manifest, expiry=some expectedExpiry)).tryGet()
+
+    for index in 0..<manifest.blocksCount:
+      let blk = (await localStore.getBlock(manifest.treeCid, index)).tryGet
+      let expiryKey = (createBlockExpirationMetadataKey(blk.cid)).tryGet
+      let expiry = await localStoreMetaDs.get(expiryKey)
+
+      check (expiry.tryGet).toSecondsSince1970 == expectedExpiry
+
   test "Store and retrieve Data Stream":
     let
       stream = BufferStream.new()
@@ -163,3 +195,114 @@ asyncchecksuite "Test Node":
     var data = newSeq[byte](testString.len)
     await stream.readExactly(addr data[0], data.len)
     check string.fromBytes(data) == testString
+
+
+asyncchecksuite "Test Node - host contracts":
+  let
+    (path, _, _) = instantiationInfo(-2, fullPaths = true) # get this file's name
+
+  var
+    file: File
+    chunker: Chunker
+    switch: Switch
+    wallet: WalletRef
+    network: BlockExcNetwork
+    clock: MockClock
+    localStore: RepoStore
+    localStoreRepoDs: DataStore
+    localStoreMetaDs: DataStore
+    engine: BlockExcEngine
+    store: NetworkStore
+    sales: Sales
+    node: CodexNodeRef
+    blockDiscovery: Discovery
+    peerStore: PeerCtxStore
+    pendingBlocks: PendingBlocksManager
+    discovery: DiscoveryEngine
+    manifest: Manifest
+    manifestCid: string
+
+  proc fetch(T: type Manifest, chunker: Chunker): Future[Manifest] {.async.} =
+    # Collect blocks from Chunker into Manifest
+    await storeDataGetManifest(localStore, chunker)
+
+  setup:
+    file = open(path.splitFile().dir /../ "fixtures" / "test.jpg")
+    chunker = FileChunker.new(file = file, chunkSize = DefaultBlockSize)
+    switch = newStandardSwitch()
+    wallet = WalletRef.new(EthPrivateKey.random())
+    network = BlockExcNetwork.new(switch)
+
+    clock = MockClock.new()
+    localStoreMetaDs = SQLiteDatastore.new(Memory).tryGet()
+    localStoreRepoDs = SQLiteDatastore.new(Memory).tryGet()
+    localStore = RepoStore.new(localStoreRepoDs, localStoreMetaDs, clock=clock)
+    await localStore.start()
+
+    blockDiscovery = Discovery.new(
+      switch.peerInfo.privateKey,
+      announceAddrs = @[MultiAddress.init("/ip4/127.0.0.1/tcp/0")
+        .expect("Should return multiaddress")])
+    peerStore = PeerCtxStore.new()
+    pendingBlocks = PendingBlocksManager.new()
+    discovery = DiscoveryEngine.new(localStore, peerStore, network, blockDiscovery, pendingBlocks)
+    engine = BlockExcEngine.new(localStore, wallet, network, discovery, peerStore, pendingBlocks)
+    store = NetworkStore.new(engine, localStore)
+    node = CodexNodeRef.new(switch, store, engine, nil, blockDiscovery) # TODO: pass `Erasure`
+
+    # Setup Host Contracts and dependencies
+    let market = MockMarket.new()
+    sales = Sales.new(market, clock, localStore, 0)
+    let hostContracts = some HostInteractions.new(clock, sales)
+    node.contracts = (ClientInteractions.none, hostContracts, ValidatorInteractions.none)
+
+    await node.start()
+
+    # Populate manifest in local store
+    manifest = await storeDataGetManifest(localStore, chunker)
+    let manifestBlock = bt.Block.new(
+        manifest.encode().tryGet(),
+        codec = DagPBCodec
+      ).tryGet()
+    manifestCid = $(manifestBlock.cid)
+    (await localStore.putBlock(manifestBlock)).tryGet()
+
+  teardown:
+    close(file)
+    await node.stop()
+
+  test "onExpiryUpdate callback is set":
+    check sales.onExpiryUpdate.isSome
+
+  test "onExpiryUpdate callback":
+    let
+      # The blocks have set default TTL, so in order to update it we have to have larger TTL
+      expectedExpiry: SecondsSince1970 = clock.now + DefaultBlockTtl.seconds + 11123
+      expiryUpdateCallback = !sales.onExpiryUpdate
+
+    (await expiryUpdateCallback(manifestCid, expectedExpiry)).tryGet()
+
+    for index in 0..<manifest.blocksCount:
+      let blk = (await localStore.getBlock(manifest.treeCid, index)).tryGet
+      let expiryKey = (createBlockExpirationMetadataKey(blk.cid)).tryGet
+      let expiry = await localStoreMetaDs.get(expiryKey)
+
+      check (expiry.tryGet).toSecondsSince1970 == expectedExpiry
+
+  test "onStore callback is set":
+    check sales.onStore.isSome
+
+  test "onStore callback":
+    let onStore = !sales.onStore
+    var request = StorageRequest.example
+    request.content.cid = manifestCid
+    var fetchedBytes: uint = 0
+
+    let onBatch = proc(blocks: seq[bt.Block]) {.async.} =
+      for blk in blocks:
+        fetchedBytes += blk.data.len.uint
+
+    (await onStore(request, 0.u256, onBatch)).tryGet()
+
+    check fetchedBytes == 2291520
+