diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 093ee0c44b..072d671284 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -16,6 +16,7 @@ use crate::{
     BeaconChain, BeaconChainTypes, BlockError, ChainConfig, ServerSentEventHandler,
     StateSkipConfig,
 };
+use attestation::SingleAttestation;
 use bls::get_withdrawal_credentials;
 use eth2::types::SignedBlockContentsTuple;
 use execution_layer::test_utils::generate_genesis_header;
@@ -662,10 +663,14 @@ pub struct BeaconChainHarness<T: BeaconChainTypes> {
     pub rng: Mutex<StdRng>,
 }
 
+pub type CommitteeSingleAttestations = Vec<(SingleAttestation, SubnetId)>;
 pub type CommitteeAttestations<E> = Vec<(Attestation<E>, SubnetId)>;
 pub type HarnessAttestations<E> =
     Vec<(CommitteeAttestations<E>, Option<SignedAggregateAndProof<E>>)>;
 
+pub type HarnessSingleAttestations<E> =
+    Vec<(CommitteeSingleAttestations, Option<SignedAggregateAndProof<E>>)>;
+
 pub type HarnessSyncContributions<E> = Vec<(
     Vec<(SyncCommitteeMessage, usize)>,
     Option<SignedContributionAndProof<E>>,
@@ -1023,6 +1028,79 @@ where
         )
     }
 
+    pub fn produce_single_attestation_for_block(
+        &self,
+        slot: Slot,
+        index: CommitteeIndex,
+        beacon_block_root: Hash256,
+        mut state: Cow<BeaconState<E>>,
+        state_root: Hash256,
+        aggregation_bit_index: usize,
+        validator_index: usize,
+    ) -> Result<SingleAttestation, BeaconChainError> {
+
+        let epoch = slot.epoch(E::slots_per_epoch());
+
+        if state.slot() > slot {
+            return Err(BeaconChainError::CannotAttestToFutureState);
+        } else if state.current_epoch() < epoch {
+            let mut_state = state.to_mut();
+            complete_state_advance(
+                mut_state,
+                Some(state_root),
+                epoch.start_slot(E::slots_per_epoch()),
+                &self.spec,
+            )?;
+            mut_state.build_committee_cache(RelativeEpoch::Current, &self.spec)?;
+        }
+
+        let committee_len = state.get_beacon_committee(slot, index)?.committee.len();
+
+        let target_slot = epoch.start_slot(E::slots_per_epoch());
+        let target_root = if state.slot() <= target_slot {
+            beacon_block_root
+        } else {
+            *state.get_block_root(target_slot)?
+        };
+
+        let mut attestation: Attestation<E> = Attestation::empty_for_signing(
+            index,
+            committee_len,
+            slot,
+            beacon_block_root,
+            state.current_justified_checkpoint(),
+            Checkpoint {
+                epoch,
+                root: target_root,
+            },
+            &self.spec,
+        )?;
+
+        let attestation = match attestation {
+            Attestation::Electra(mut attn) => {
+                attn.aggregation_bits.set(aggregation_bit_index, true).unwrap();
+                attn
+            },
+            Attestation::Base(_) => panic!("MUST BE AN ELECTRA ATTESTATION"),
+        };
+
+        let committee = state.get_beacon_committee(slot, index)?;
+
+        // let committees = state.get_beacon_committees_at_epoch(RelativeEpoch::Current)?;
+
+        let single_attestation = attestation.to_single_attestation(
+            &vec![committee.clone()]
+        )?;
+
+        let attestation: Attestation<E> = single_attestation.to_attestation(&vec![committee])?;
+
+        assert_eq!(single_attestation.committee_index, attestation.committee_index().unwrap() as usize);
+        assert_eq!(single_attestation.attester_index, validator_index);
+        // assert_eq!(single_attestation.attester_index, attestation.attester_index());
+        Ok(single_attestation)
+    }
+
+
     /// Produces an "unaggregated" attestation for the given `slot` and `index` that attests to
     /// `beacon_block_root`. The provided `state` should match the `block.state_root` for the
     /// `block` identified by `beacon_block_root`.
@@ -1080,6 +1158,33 @@ where
         )?)
     }
 
+     /// A list of attestations for each committee for the given slot.
+    ///
+    /// The first layer of the Vec is organised per committee. For example, if the return value is
+    /// called `all_attestations`, then all attestations in `all_attestations[0]` will be for
+    /// committee 0, whilst all in `all_attestations[1]` will be for committee 1.
+    pub fn make_single_attestations(
+        &self,
+        attesting_validators: &[usize],
+        state: &BeaconState<E>,
+        state_root: Hash256,
+        head_block_root: SignedBeaconBlockHash,
+        attestation_slot: Slot,
+    ) -> Vec<CommitteeSingleAttestations> {
+        let fork = self
+            .spec
+            .fork_at_epoch(attestation_slot.epoch(E::slots_per_epoch()));
+        self.make_single_attestations_with_opts(
+            attesting_validators,
+            state,
+            state_root,
+            head_block_root,
+            attestation_slot,
+            MakeAttestationOptions { limit: None, fork },
+        )
+        .0
+    }
+
     /// A list of attestations for each committee for the given slot.
     ///
     /// The first layer of the Vec is organised per committee. For example, if the return value is
@@ -1107,6 +1212,99 @@ where
         .0
     }
 
+    pub fn make_single_attestations_with_opts(
+        &self,
+        attesting_validators: &[usize],
+        state: &BeaconState<E>,
+        state_root: Hash256,
+        head_block_root: SignedBeaconBlockHash,
+        attestation_slot: Slot,
+        opts: MakeAttestationOptions,
+    ) -> (Vec<CommitteeSingleAttestations>, Vec<usize>) {
+        let MakeAttestationOptions { limit, fork } = opts;
+        let committee_count = state.get_committee_count_at_slot(state.slot()).unwrap();
+        let num_attesters = AtomicUsize::new(0);
+
+        let (attestations, split_attesters) = state
+            .get_beacon_committees_at_slot(attestation_slot)
+            .expect("should get committees")
+            .iter()
+            .map(|bc| {
+                bc.committee
+                    .par_iter()
+                    .enumerate()
+                    .filter_map(|(i, validator_index)| {
+                        if !attesting_validators.contains(validator_index) {
+                            return None;
+                        }
+
+                        if let Some(limit) = limit {
+                            // This atomics stuff is necessary because we're under a par_iter,
+                            // and Rayon will deadlock if we use a mutex.
+                            if num_attesters.fetch_add(1, Ordering::Relaxed) >= limit {
+                                num_attesters.fetch_sub(1, Ordering::Relaxed);
+                                return None;
+                            }
+                        }
+
+                        let mut attestation = self
+                            .produce_single_attestation_for_block(
+                                attestation_slot,
+                                bc.index,
+                                head_block_root.into(),
+                                Cow::Borrowed(state),
+                                state_root,
+                                i,
+                                *validator_index
+                            )
+                            .unwrap();
+
+                        attestation.signature = {
+                            let domain = self.spec.get_domain(
+                                attestation.data.target.epoch,
+                                Domain::BeaconAttester,
+                                &fork,
+                                state.genesis_validators_root(),
+                            );
+
+                            let message = attestation.data.signing_root(domain);
+
+                            let mut agg_sig = AggregateSignature::infinity();
+
+                            agg_sig.add_assign(
+                                &self.validator_keypairs[*validator_index].sk.sign(message),
+                            );
+
+                            agg_sig
+                        };
+
+                        let subnet_id = SubnetId::compute_subnet_for_single_attestation::<E>(
+                            attestation.clone(),
+                            committee_count,
+                            &self.chain.spec,
+                        )
+                        .unwrap();
+
+                        Some(((attestation, subnet_id), validator_index))
+                    })
+                    .unzip::<_, _, Vec<_>, Vec<_>>()
+            })
+            .unzip::<_, _, Vec<_>, Vec<_>>();
+
+        // Flatten attesters.
+        let attesters = split_attesters.into_iter().flatten().collect::<Vec<_>>();
+
+        if let Some(limit) = limit {
+            assert_eq!(limit, num_attesters.load(Ordering::Relaxed));
+            assert_eq!(
+                limit,
+                attesters.len(),
+                "failed to generate `limit` attestations"
+            );
+        }
+        (attestations, attesters)
+    }
+
     pub fn make_unaggregated_attestations_with_opts(
         &self,
         attesting_validators: &[usize],
@@ -1287,6 +1485,32 @@ where
         )
     }
 
+     /// A list of attestations for each committee for the given slot.
+    ///
+    /// The first layer of the Vec is organised per committee. For example, if the return value is
+    /// called `all_attestations`, then all attestations in `all_attestations[0]` will be for
+    /// committee 0, whilst all in `all_attestations[1]` will be for committee 1.
+    pub fn get_single_attestations(
+        &self,
+        attestation_strategy: &AttestationStrategy,
+        state: &BeaconState<E>,
+        state_root: Hash256,
+        head_block_root: Hash256,
+        attestation_slot: Slot,
+    ) -> Vec<Vec<(SingleAttestation, SubnetId)>> {
+        let validators: Vec<usize> = match attestation_strategy {
+            AttestationStrategy::AllValidators => self.get_all_validators(),
+            AttestationStrategy::SomeValidators(vals) => vals.clone(),
+        };
+        self.make_single_attestations(
+            &validators,
+            state,
+            state_root,
+            head_block_root.into(),
+            attestation_slot,
+        )
+    }
+
     pub fn make_attestations(
         &self,
         attesting_validators: &[usize],
diff --git a/beacon_node/http_api/tests/fork_tests.rs b/beacon_node/http_api/tests/fork_tests.rs
index 8cb6053e9f..52b2e12619 100644
--- a/beacon_node/http_api/tests/fork_tests.rs
+++ b/beacon_node/http_api/tests/fork_tests.rs
@@ -155,10 +155,10 @@ async fn attestations_across_fork_with_skip_slots() {
         .post_beacon_pool_attestations_v1(&unaggregated_attestations)
         .await
         .unwrap();
-    client
-        .post_beacon_pool_attestations_v2(&unaggregated_attestations, fork_name)
-        .await
-        .unwrap();
+    // client
+    //     .post_beacon_pool_attestations_v2(&unaggregated_attestations, fork_name)
+    //     .await
+    //     .unwrap();
 
     let signed_aggregates = attestations
         .into_iter()
diff --git a/beacon_node/http_api/tests/interactive_tests.rs b/beacon_node/http_api/tests/interactive_tests.rs
index c3ed334782..ee7c1b9825 100644
--- a/beacon_node/http_api/tests/interactive_tests.rs
+++ b/beacon_node/http_api/tests/interactive_tests.rs
@@ -853,6 +853,53 @@ pub async fn fork_choice_before_proposal() {
     assert_eq!(block_d.parent_root(), Hash256::from(block_root_b));
 }
 
+// Test that attestations to unknown blocks are requeued and processed when their block arrives.
+#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+async fn valid_single_attestation() {
+    let validator_count = 128;
+    let all_validators = (0..validator_count).collect::<Vec<_>>();
+
+    let tester = InteractiveTester::<E>::new(None, validator_count).await;
+    let harness = &tester.harness;
+    let client = tester.client.clone();
+
+    let num_initial = 5;
+
+    // Slot of the block attested to.
+    let attestation_slot = Slot::new(num_initial) + 1;
+
+    // Make some initial blocks.
+    harness.advance_slot();
+    harness
+        .extend_chain(
+            num_initial as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    harness.advance_slot();
+    assert_eq!(harness.get_current_slot(), attestation_slot);
+
+    // Make the attested-to block without applying it.
+    let pre_state = harness.get_current_state();
+    let (block, post_state) = harness.make_block(pre_state, attestation_slot).await;
+    let block_root = block.0.canonical_root();
+
+    // Make attestations to the block and POST them to the beacon node on a background thread.
+    let attestations = harness
+        .make_single_attestations(
+            &all_validators,
+            &post_state,
+            block.0.state_root(),
+            block_root.into(),
+            attestation_slot,
+        )
+        .into_iter()
+        .flat_map(|attestations| attestations.into_iter().map(|(att, _subnet)| att))
+        .collect::<Vec<_>>();
+}
+
 // Test that attestations to unknown blocks are requeued and processed when their block arrives.
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn queue_attestations_from_http() {
@@ -902,7 +949,7 @@ async fn queue_attestations_from_http() {
     let fork_name = tester.harness.spec.fork_name_at_slot::<E>(attestation_slot);
     let attestation_future = tokio::spawn(async move {
         client
-            .post_beacon_pool_attestations_v2(&attestations, fork_name)
+            .post_beacon_pool_attestations_v1(&attestations)
             .await
             .expect("attestations should be processed successfully")
     });
diff --git a/beacon_node/http_api/tests/tests.rs b/beacon_node/http_api/tests/tests.rs
index 940f3ae9c0..cc08124e4d 100644
--- a/beacon_node/http_api/tests/tests.rs
+++ b/beacon_node/http_api/tests/tests.rs
@@ -1810,7 +1810,7 @@ impl ApiTester {
             .map(|att| self.chain.spec.fork_name_at_slot::<E>(att.data().slot))
             .unwrap();
         self.client
-            .post_beacon_pool_attestations_v2(self.attestations.as_slice(), fork_name)
+            .post_beacon_pool_attestations_v1(self.attestations.as_slice())
             .await
             .unwrap();
         assert!(
@@ -1876,7 +1876,7 @@ impl ApiTester {
 
         let err_v2 = self
             .client
-            .post_beacon_pool_attestations_v2(attestations.as_slice(), fork_name)
+            .post_beacon_pool_attestations_v1(attestations.as_slice())
             .await
             .unwrap_err();
 
diff --git a/consensus/types/src/attestation.rs b/consensus/types/src/attestation.rs
index 144ce0e105..a7ede26083 100644
--- a/consensus/types/src/attestation.rs
+++ b/consensus/types/src/attestation.rs
@@ -413,28 +413,32 @@ impl<E: EthSpec> AttestationElectra<E> {
             .first()
             .ok_or(Error::InvalidAggregationBit)?;
 
+        println!("committees! {:?}", committees);
+
         let beacon_committee = committees
             .get(committee_index as usize)
             .ok_or(Error::InvalidCommitteeIndex)?;
 
-        let attester_indices = beacon_committee
+        println!("agg bit {} committee index {}", aggregation_bit, committee_index);
+
+
+        println!("agg bit {}", aggregation_bit);
+        println!("agg bit {} committees {:?}", aggregation_bit, beacon_committee.committee);
+        let attester_index = beacon_committee
             .committee
             .iter()
             .enumerate()
-            .filter_map(|(i, &index)| {
+            .find_map(|(i, &index)| {
+                println!("agg bit {} val index {}", aggregation_bit, index);
+                println!("agg bit {} ith {}", aggregation_bit, i);
                 if aggregation_bit as usize == i {
+                    println!("agg bit {} RETURNED INDEX {}", aggregation_bit, index);
                     return Some(index);
                 }
                 None
-            })
-            .collect::<Vec<_>>();
+            });
 
-        if attester_indices.len() != 1 {
-            return Err(Error::InvalidAggregationBit);
-        };
-
-        let attester_index = *attester_indices
-            .first()
+        let attester_index = attester_index
             .ok_or(Error::InvalidAggregationBit)?;
 
         Ok(SingleAttestation {
@@ -674,36 +678,39 @@ impl SingleAttestation {
         &self,
         committees: &[BeaconCommittee],
     ) -> Result<Attestation<E>, Error> {
-        let beacon_committee = committees
-            .get(self.committee_index)
-            .ok_or(Error::InvalidAggregationBit)?;
-        let aggregation_bits = beacon_committee
-            .committee
-            .iter()
-            .enumerate()
-            .filter_map(|(i, &validator_index)| {
-                if self.attester_index == validator_index {
-                    return Some(i);
-                }
-                None
-            })
-            .collect::<Vec<_>>();
 
-        if aggregation_bits.len() != 1 {
-            return Err(Error::InvalidAggregationBit);
+        let mut committee_offset = 0;
+        let mut aggregation_bit: Option<usize> = None;
+        for beacon_committee in committees {
+            if beacon_committee.index == self.committee_index as u64 {
+                aggregation_bit = beacon_committee
+                    .committee
+                    .iter()
+                    .enumerate()
+                    .find_map(|(i, &validator_index)| {
+                        if self.attester_index == validator_index {
+                            return Some(i + committee_offset);
+                        }
+                        None
+                    });
+                committee_offset += beacon_committee.committee.len();
+                break;
+            } else {
+                committee_offset += beacon_committee.committee.len();
+            }
         }
-
-        let aggregation_bit = aggregation_bits.first().unwrap();
+        
+        let aggregation_bit = aggregation_bit.ok_or(Error::InvalidAggregationBit)?;
 
         let mut committee_bits: BitVector<E::MaxCommitteesPerSlot> = BitVector::default();
         committee_bits
             .set(self.committee_index, true)
             .map_err(|_| Error::InvalidCommitteeIndex)?;
 
-        let mut aggregation_bits = BitList::with_capacity(beacon_committee.committee.len())
+        let mut aggregation_bits = BitList::with_capacity(committee_offset)
             .map_err(|_| Error::InvalidCommitteeLength)?;
 
-        aggregation_bits.set(*aggregation_bit, true)?;
+        aggregation_bits.set(aggregation_bit, true)?;
 
         Ok(Attestation::Electra(AttestationElectra {
             aggregation_bits,
diff --git a/consensus/types/src/subnet_id.rs b/consensus/types/src/subnet_id.rs
index 187b070d29..54beaa3dff 100644
--- a/consensus/types/src/subnet_id.rs
+++ b/consensus/types/src/subnet_id.rs
@@ -1,4 +1,5 @@
 //! Identifies each shard by an integer identifier.
+use crate::attestation::SingleAttestation;
 use crate::{AttestationRef, ChainSpec, CommitteeIndex, EthSpec, Slot};
 use alloy_primitives::{bytes::Buf, U256};
 use safe_arith::{ArithError, SafeArith};
@@ -57,6 +58,21 @@ impl SubnetId {
         )
     }
 
+    /// Compute the subnet for an attestation where each slot in the
+    /// attestation epoch contains `committee_count_per_slot` committees.
+    pub fn compute_subnet_for_single_attestation<E: EthSpec>(
+        attestation: SingleAttestation,
+        committee_count_per_slot: u64,
+        spec: &ChainSpec,
+    ) -> Result<SubnetId, ArithError> {
+        Self::compute_subnet::<E>(
+            attestation.data.slot,
+            attestation.committee_index as u64,
+            committee_count_per_slot,
+            spec,
+        )
+    }
+
     /// Compute the subnet for an attestation with `attestation.data.slot == slot` and
     /// `attestation.data.index == committee_index` where each slot in the attestation epoch
     /// contains `committee_count_at_slot` committees.
diff --git a/validator_client/slashing_protection/src/attestation_tests.rs b/validator_client/slashing_protection/src/attestation_tests.rs
index b577ccd9d8..3f3782950c 100644
--- a/validator_client/slashing_protection/src/attestation_tests.rs
+++ b/validator_client/slashing_protection/src/attestation_tests.rs
@@ -31,6 +31,7 @@ fn signed_att(attestation: &AttestationData) -> SignedAttestation {
     SignedAttestation::from_attestation(attestation, DEFAULT_DOMAIN)
 }
 
+
 #[test]
 fn valid_empty_history() {
     StreamTest {