Adding respective validations for block heights and hashes

packages/consensus/src/validation/block.cairo

@@ -2,7 +2,10 @@
 use crate::types::utxo_set::UtxoSet;
 use crate::types::transaction::Transaction;
 use crate::codec::{Encode, TransactionCodec};
-use utils::{hash::Digest, merkle_tree::merkle_root, double_sha256::double_sha256_byte_array};
+use utils::{
+    hash::Digest, merkle_tree::merkle_root, double_sha256::double_sha256_byte_array,
+    hex::hex_to_hash_rev
+};
 use super::transaction::validate_transaction;
 use core::num::traits::zero::Zero;
 
@@ -93,3 +96,23 @@ pub fn compute_and_validate_tx_data(
 
     Result::Ok((total_fee, merkle_root(ref txids), wtxid_root))
 }
+
+
+pub fn validate_bip30_block_hash(block_height: u32, block_hash: @Digest) -> Result<(), ByteArray> {
+    if block_height == 91722 {
+        let expected_hash: Digest = hex_to_hash_rev(
+            "00000000000271a2dc26e7667f8419f2e15416dc6955e5a6c6cdf3f2574dd08e"
+        );
+        if *block_hash != expected_hash {
+            return Result::Err("Block hash mismatch for BIP-30 exception at height 91722");
+        }
+    } else if block_height == 91812 {
+        let expected_hash: Digest = hex_to_hash_rev(
+            "00000000000af0aed4792b1acee3d966af36cf5def14935db8de83d6f9306f2f"
+        );
+        if *block_hash != expected_hash {
+            return Result::Err("Block hash mismatch for BIP-30 exception at height 91812");
+        }
+    }
+    Result::Ok(())
+}

packages/consensus/src/validation/coinbase.cairo

@@ -168,6 +168,10 @@ fn validate_coinbase_outputs(
     Result::Ok(())
 }
 
+pub fn is_bip30_unspendable(block_height: u32) -> bool {
+    block_height == 91722 || block_height == 91812
+}
+
 #[cfg(test)]
 mod tests {
     use crate::types::transaction::{TxIn, TxOut, Transaction, OutPoint};

packages/consensus/src/validation/transaction.cairo

@@ -7,6 +7,9 @@ use crate::validation::locktime::{
 };
 use utils::hash::Digest;
 
+const OP_RETURN: u32 = 0x6a;
+const MAX_SCRIPT_SIZE: u32 = 10000;
+
 /// Validate transaction and return transaction fee.
 ///
 /// This does not include script checks and outpoint inclusion verification.
@@ -120,6 +123,10 @@ fn validate_coinbase_maturity(output_height: u32, block_height: u32) -> Result<(
     }
 }
 
+fn is_pubscript_unspendable(pubscript: @ByteArray) -> bool {
+    pubscript[0].into() == OP_RETURN || pubscript.len() > MAX_SCRIPT_SIZE
+}
+
 #[cfg(test)]
 mod tests {
     use core::dict::Felt252Dict;