diff --git a/storage/blockchain/src/lib.rs b/storage/blockchain/src/lib.rs
index 0dea345b..8a6f96b6 100644
--- a/storage/blockchain/src/lib.rs
+++ b/storage/blockchain/src/lib.rs
@@ -98,6 +98,8 @@
         clippy::too_many_lines
     )
 )]
+extern crate core;
+
 // Only allow building 64-bit targets.
 //
 // This allows us to assume 64-bit
diff --git a/storage/blockchain/src/ops/alt_block.rs b/storage/blockchain/src/ops/alt_block.rs
index d04899ef..82a37ba8 100644
--- a/storage/blockchain/src/ops/alt_block.rs
+++ b/storage/blockchain/src/ops/alt_block.rs
@@ -1,12 +1,21 @@
-use bytemuck::TransparentWrapper;
+use std::cmp::max;
 
-use cuprate_database::{DatabaseRw, RuntimeError, StorableVec, DatabaseRo};
-use cuprate_helper::map::split_u128_into_low_high_bits;
-use cuprate_types::{AltBlockInformation, Chain, VerifiedTransactionInformation};
+use bytemuck::TransparentWrapper;
+use cuprate_database::{DatabaseRo, DatabaseRw, RuntimeError, StorableVec};
+use cuprate_helper::map::{combine_low_high_bits_to_u128, split_u128_into_low_high_bits};
+use cuprate_types::{
+    AltBlockInformation, Chain, ChainId, ExtendedBlockHeader, HardFork,
+    VerifiedTransactionInformation,
+};
+use monero_serai::block::BlockHeader;
 
 use crate::{
-    tables::TablesMut,
-    types::{AltBlockHeight, AltChainInfo, AltTransactionInfo, BlockHash, CompactAltBlockInfo},
+    ops::block::{get_block_extended_header_from_height, get_block_info},
+    tables::{Tables, TablesMut},
+    types::{
+        AltBlockHeight, AltChainInfo, AltTransactionInfo, BlockHash, BlockHeight,
+        CompactAltBlockInfo,
+    },
 };
 
 pub fn add_alt_block(
@@ -102,3 +111,119 @@ pub fn check_add_alt_chain_info(
         },
     )
 }
+
+pub fn alt_block_hash(
+    block_height: &BlockHeight,
+    alt_chain: ChainId,
+    tables: &mut impl Tables,
+) -> Result<BlockHash, RuntimeError> {
+    let alt_chains = tables.alt_chain_infos();
+
+    let original_chain = {
+        let mut chain = alt_chain.into();
+        loop {
+            let chain_info = alt_chains.get(&chain)?;
+
+            if chain_info.common_ancestor_height < *block_height {
+                break Chain::Alt(chain.into());
+            }
+
+            match chain_info.parent_chain.into() {
+                Chain::Main => break Chain::Main,
+                Chain::Alt(alt_chain_id) => {
+                    chain = alt_chain_id.into();
+                    continue;
+                }
+            }
+        }
+    };
+
+    match original_chain {
+        Chain::Main => {
+            get_block_info(&block_height, tables.block_infos()).map(|info| info.block_hash)
+        }
+        Chain::Alt(chain_id) => tables
+            .alt_blocks_info()
+            .get(&AltBlockHeight {
+                chain_id: chain_id.into(),
+                height: *block_height,
+            })
+            .map(|info| info.block_hash),
+    }
+}
+
+pub fn alt_extended_headers_in_range(
+    range: std::ops::Range<BlockHeight>,
+    alt_chain: ChainId,
+    tables: &impl Tables,
+) -> Result<Vec<ExtendedBlockHeader>, RuntimeError> {
+    // TODO: this function does not use rayon, however it probably should.
+
+    let mut ranges = Vec::with_capacity(5);
+    let alt_chains = tables.alt_chain_infos();
+
+    let mut i = range.end;
+    let mut current_chain_id = alt_chain.into();
+    while i > range.start {
+        let chain_info = alt_chains.get(&current_chain_id)?;
+
+        let start_height = max(range.start, chain_info.common_ancestor_height + 1);
+
+        ranges.push((chain_info.parent_chain.into(), start_height..i));
+        i = chain_info.common_ancestor_height;
+
+        match chain_info.parent_chain.into() {
+            Chain::Main => {
+                ranges.push((Chain::Main, range.start..i));
+                break;
+            }
+            Chain::Alt(alt_chain_id) => {
+                current_chain_id = alt_chain_id.into();
+                continue;
+            }
+        }
+    }
+
+    let res = ranges
+        .into_iter()
+        .rev()
+        .map(|(chain, range)| {
+            range.into_iter().map(move |height| match chain {
+                Chain::Main => get_block_extended_header_from_height(&height, tables),
+                Chain::Alt(chain_id) => get_alt_block_extended_header_from_height(
+                    &AltBlockHeight {
+                        chain_id: chain_id.into(),
+                        height,
+                    },
+                    tables,
+                ),
+            })
+        })
+        .flatten()
+        .collect::<Result<_, _>>()?;
+
+    Ok(res)
+}
+
+pub fn get_alt_block_extended_header_from_height(
+    height: &AltBlockHeight,
+    table: &impl Tables,
+) -> Result<ExtendedBlockHeader, RuntimeError> {
+    let block_info = table.alt_blocks_info().get(height)?;
+
+    let block_blob = table.alt_block_blobs().get(height)?.0;
+
+    let block_header = BlockHeader::read(&mut block_blob.as_slice())?;
+
+    Ok(ExtendedBlockHeader {
+        version: HardFork::from_version(0).expect("Block in DB must have correct version"),
+        vote: block_header.hardfork_version,
+        timestamp: block_header.timestamp,
+        cumulative_difficulty: combine_low_high_bits_to_u128(
+            block_info.cumulative_difficulty_low,
+            block_info.cumulative_difficulty_high,
+        ),
+        block_weight: block_info.weight,
+        long_term_weight: block_info.long_term_weight,
+    })
+}
diff --git a/storage/blockchain/src/ops/block.rs b/storage/blockchain/src/ops/block.rs
index 4f77d736..2e110fed 100644
--- a/storage/blockchain/src/ops/block.rs
+++ b/storage/blockchain/src/ops/block.rs
@@ -2,7 +2,7 @@
 
 //---------------------------------------------------------------------------------------------------- Import
 use bytemuck::TransparentWrapper;
-use monero_serai::block::Block;
+use monero_serai::block::{Block, BlockHeader};
 
 use cuprate_database::{
     RuntimeError, StorableVec, {DatabaseRo, DatabaseRw},
@@ -190,7 +190,7 @@ pub fn get_block_extended_header_from_height(
 ) -> Result<ExtendedBlockHeader, RuntimeError> {
     let block_info = tables.block_infos().get(block_height)?;
     let block_blob = tables.block_blobs().get(block_height)?.0;
-    let block = Block::read(&mut block_blob.as_slice())?;
+    let block_header = BlockHeader::read(&mut block_blob.as_slice())?;
 
     let cumulative_difficulty = combine_low_high_bits_to_u128(
         block_info.cumulative_difficulty_low,
@@ -201,10 +201,10 @@ pub fn get_block_extended_header_from_height(
     #[allow(clippy::cast_possible_truncation)]
     Ok(ExtendedBlockHeader {
         cumulative_difficulty,
-        version: HardFork::from_version(block.header.hardfork_version)
+        version: HardFork::from_version(block_header.hardfork_version)
             .expect("Stored block must have a valid hard-fork"),
-        vote: block.header.hardfork_signal,
-        timestamp: block.header.timestamp,
+        vote: block_header.hardfork_signal,
+        timestamp: block_header.timestamp,
         block_weight: block_info.weight as usize,
         long_term_weight: block_info.long_term_weight as usize,
     })
diff --git a/storage/blockchain/src/ops/mod.rs b/storage/blockchain/src/ops/mod.rs
index 1ec9c237..8a8f0f15 100644
--- a/storage/blockchain/src/ops/mod.rs
+++ b/storage/blockchain/src/ops/mod.rs
@@ -102,12 +102,12 @@
 //! # Ok(()) }
 //! ```
 
+pub mod alt_block;
 pub mod block;
 pub mod blockchain;
 pub mod key_image;
 pub mod output;
 pub mod property;
 pub mod tx;
-pub mod alt_block;
 
 mod macros;
diff --git a/storage/blockchain/src/service/read.rs b/storage/blockchain/src/service/read.rs
index 207da416..eef40b5e 100644
--- a/storage/blockchain/src/service/read.rs
+++ b/storage/blockchain/src/service/read.rs
@@ -22,6 +22,7 @@ use cuprate_types::{
 
 use crate::{
     ops::{
+        alt_block::{alt_block_hash, alt_extended_headers_in_range},
         block::{
             block_exists, get_block_extended_header_from_height, get_block_height, get_block_info,
         },
@@ -33,7 +34,7 @@ use crate::{
         free::{compact_history_genesis_not_included, compact_history_index_to_height_offset},
         types::{BlockchainReadHandle, ResponseResult},
     },
-    tables::{BlockHeights, BlockInfos, OpenTables, Tables},
+    tables::{AltBlockHeights, BlockHeights, BlockInfos, OpenTables, Tables},
     types::{Amount, AmountIndex, BlockHash, BlockHeight, KeyImage, PreRctOutputId},
 };
 
@@ -87,7 +88,7 @@ fn map_request(
     match request {
         R::BlockExtendedHeader(block) => block_extended_header(env, block),
         R::BlockHash(block, chain) => block_hash(env, block, chain),
-        R::FindBlock(_) => todo!("Add alt blocks to DB"),
+        R::FindBlock(block_hash) => find_block(env, block_hash),
         R::FilterUnknownHashes(hashes) => filter_unknown_hashes(env, hashes),
         R::BlockExtendedHeaderInRange(range, chain) => {
             block_extended_header_in_range(env, range, chain)
@@ -198,12 +199,39 @@ fn block_hash(env: &ConcreteEnv, block_height: BlockHeight, chain: Chain) -> Res
 
     let block_hash = match chain {
         Chain::Main => get_block_info(&block_height, &table_block_infos)?.block_hash,
-        Chain::Alt(_) => todo!("Add alt blocks to DB"),
+        Chain::Alt(chain) => {
+            alt_block_hash(&block_height, chain, &mut env_inner.open_tables(&tx_ro)?)?
+        }
     };
 
     Ok(BlockchainResponse::BlockHash(block_hash))
 }
 
+/// [`BlockchainReadRequest::FindBlock`]
+fn find_block(env: &ConcreteEnv, block_hash: BlockHash) -> ResponseResult {
+    // Single-threaded, no `ThreadLocal` required.
+    let env_inner = env.env_inner();
+    let tx_ro = env_inner.tx_ro()?;
+
+    let table_block_heights = env_inner.open_db_ro::<BlockHeights>(&tx_ro)?;
+
+    // Check the main chain first.
+    match table_block_heights.get(&block_hash) {
+        Ok(height) => return Ok(BlockchainResponse::FindBlock(Some((Chain::Main, height)))),
+        Err(RuntimeError::KeyNotFound) => (),
+        Err(e) => return Err(e),
+    }
+
+    let table_alt_block_heights = env_inner.open_db_ro::<AltBlockHeights>(&tx_ro)?;
+
+    let height = table_alt_block_heights.get(&block_hash)?;
+
+    Ok(BlockchainResponse::FindBlock(Some((
+        Chain::Alt(height.chain_id.into()),
+        height.height,
+    ))))
+}
+
 /// [`BlockchainReadRequest::FilterUnknownHashes`].
 #[inline]
 fn filter_unknown_hashes(env: &ConcreteEnv, mut hashes: HashSet<BlockHash>) -> ResponseResult {
@@ -254,7 +282,14 @@ fn block_extended_header_in_range(
                 get_block_extended_header_from_height(&block_height, tables)
             })
             .collect::<Result<Vec<ExtendedBlockHeader>, RuntimeError>>()?,
-        Chain::Alt(_) => todo!("Add alt blocks to DB"),
+        Chain::Alt(chain_id) => {
+            let tx_ro = tx_ro.get_or_try(|| env_inner.tx_ro())?;
+            alt_extended_headers_in_range(
+                range,
+                chain_id,
+                get_tables!(env_inner, tx_ro, tables)?.as_ref(),
+            )?
+        }
     };
 
     Ok(BlockchainResponse::BlockExtendedHeaderInRange(vec))