diff --git a/packages/cmds/src/main.cairo b/packages/cmds/src/main.cairo
index ff11139e..eb6e2654 100644
--- a/packages/cmds/src/main.cairo
+++ b/packages/cmds/src/main.cairo
@@ -1,7 +1,8 @@
 use shinigami_compiler::compiler::CompilerImpl;
 use shinigami_engine::engine::{EngineImpl, EngineInternalImpl};
-use shinigami_engine::utxo::{UTXO};
-use shinigami_engine::transaction::{EngineInternalTransactionImpl, EngineInternalTransactionTrait};
+use shinigami_engine::transaction::{
+    EngineInternalTransactionImpl, EngineInternalTransactionTrait, UTXO,
+};
 use shinigami_engine::flags;
 use shinigami_engine::witness;
 use shinigami_engine::hash_cache::HashCacheImpl;
diff --git a/packages/engine/src/lib.cairo b/packages/engine/src/lib.cairo
index 0dbe353f..2a70ac14 100644
--- a/packages/engine/src/lib.cairo
+++ b/packages/engine/src/lib.cairo
@@ -32,7 +32,6 @@ pub mod signature {
     pub mod schnorr;
 }
 pub mod transaction;
-pub mod utxo;
 
 #[cfg(test)]
 mod tests {
diff --git a/packages/engine/src/signature/sighash.cairo b/packages/engine/src/signature/sighash.cairo
index 18c36580..e6e86c31 100644
--- a/packages/engine/src/signature/sighash.cairo
+++ b/packages/engine/src/signature/sighash.cairo
@@ -221,6 +221,10 @@ pub impl TaprootSighashOptionsImpl of TaprootSighashOptionsTrait {
         }
     }
 
+    fn set_annex(ref self: TaprootSighashOptions, annex: @ByteArray) {
+        self.annex_hash = @sha256_byte_array(annex);
+    }
+
     // Write in msg the sihash message extension defined by the current active flag.
     fn write_digest_extensions(ref self: TaprootSighashOptions, ref msg: ByteArray) {
         // Base extension doesn'nt modify the digest at all.
diff --git a/packages/engine/src/signature/taproot_signature.cairo b/packages/engine/src/signature/taproot_signature.cairo
index 94b5ad53..2f486a2d 100644
--- a/packages/engine/src/signature/taproot_signature.cairo
+++ b/packages/engine/src/signature/taproot_signature.cairo
@@ -4,7 +4,9 @@ use crate::transaction::{
     EngineTransactionTrait,
 };
 use crate::flags::ScriptFlags;
-use crate::signature::{constants, schnorr, sighash, sighash::{TaprootSighashOptionsTrait}};
+use crate::signature::{
+    constants, schnorr, sighash, sighash::{TaprootSighashOptionsTrait, TaprootSighashOptions},
+};
 use crate::hash_cache::{TxSigHashes, SigHashMidstateTrait};
 use crate::errors::Error;
 
@@ -54,6 +56,13 @@ pub fn parse_taproot_sig_and_pk<
     return Result::Ok((pk, sig, sighash_type));
 }
 
+// TODO: remplace sig result by VerifyResult ?
+// #[derive(Clone, Copy, Drop, Default)]
+// pub struct VerifyResult {
+//     sigValid: bool,
+//     sigMatch: bool,
+// }
+
 #[derive(Drop)]
 pub struct TaprootSigVerifier<T> {
     // public key as a point on the secp256k1 curve, used to verify the signature
@@ -96,7 +105,7 @@ pub trait TaprootSigVerifierTrait<
         sig_bytes: @ByteArray, pk_bytes: @ByteArray, ref engine: Engine<T>,
     ) -> Result<TaprootSigVerifier<T>, felt252>;
     fn verify(self: TaprootSigVerifier<T>) -> Result<(), felt252>;
-    fn verify_base(self: TaprootSigVerifier<T>) -> Result<(), felt252>;
+    fn verify_base(self: TaprootSigVerifier<T>, ref engine: Engine<T>) -> Result<(), felt252>;
 }
 
 pub impl TaprootSigVerifierImpl<
@@ -179,16 +188,42 @@ pub impl TaprootSigVerifierImpl<
         let mut opts = TaprootSighashOptionsTrait::new_with_annex(self.annex);
         let sig_hash = sighash::calc_taproot_signature_hash::<
             T,
-        >(self.hashCache, self.hash_type, self.tx, self.inputIndex, self.prevOuts, ref opts)?;
+        >(
+            self.hashCache, self.hash_type, self.tx, self.inputIndex, self.prevOuts, ref opts,
+        )?; // on error should return error or false ?
 
         if !schnorr::verify_schnorr(self.sig, @sig_hash.into(), self.pk_bytes)? {
-            return Result::Err(Error::TAPROOT_INVALID_SIG);
+            return Result::Err(
+                Error::TAPROOT_INVALID_SIG,
+            ); // should not return error ? VerifyResult ?
         }
         Result::Ok(())
     }
 
-    fn verify_base(self: TaprootSigVerifier<T>) -> Result<(), felt252> {
-        // TODO: implement taproot verification
+    fn verify_base(self: TaprootSigVerifier<T>, ref engine: Engine<T>) -> Result<(), felt252> {
+        if (self.pub_key.is_none()) {
+            return Result::Ok(());
+        }
+
+        let mut opts = TaprootSighashOptionsTrait::new_with_tapscript_version(
+            engine.taproot_context.code_sep, @engine.taproot_context.tapleaf_hash.into(),
+        );
+
+        if engine.taproot_context.annex.len() > 0 {
+            opts.set_annex(engine.taproot_context.annex);
+        }
+
+        let sig_hash = sighash::calc_taproot_signature_hash::<
+            T,
+        >(
+            self.hashCache, self.hash_type, self.tx, self.inputIndex, self.prevOuts, ref opts,
+        )?; // on error should return error or false ?
+
+        if !schnorr::verify_schnorr(self.sig, @sig_hash.into(), self.pk_bytes)? {
+            return Result::Err(
+                Error::TAPROOT_INVALID_SIG,
+            ); // should not return error ? VerifyResult ?
+        }
         Result::Ok(())
     }
 }
diff --git a/packages/engine/src/tests/test_taproot_hash.cairo b/packages/engine/src/tests/test_taproot_hash.cairo
index 4b09888a..2c73776a 100644
--- a/packages/engine/src/tests/test_taproot_hash.cairo
+++ b/packages/engine/src/tests/test_taproot_hash.cairo
@@ -3,10 +3,10 @@ use crate::signature::sighash::{
     TAPSCRIPT_SIGHASH_EXT_FLAG,
 };
 use crate::transaction::{
-    EngineTransactionOutput, EngineTransaction, EngineTransactionInput, EngineOutPoint,
+    EngineTransactionOutput, EngineTransaction, EngineTransactionInput, EngineOutPoint, UTXO,
 };
 use crate::hash_cache::{TxSigHashes, SigHashMidstateTrait};
-use shinigami_engine::utxo::{UTXO};
+use shinigami_engine::utxo::{};
 use shinigami_utils::bytecode::hex_to_bytecode;
 use shinigami_utils::byte_array::{U256IntoByteArray};
 
diff --git a/packages/engine/src/transaction.cairo b/packages/engine/src/transaction.cairo
index cfb2fc34..5e254be0 100644
--- a/packages/engine/src/transaction.cairo
+++ b/packages/engine/src/transaction.cairo
@@ -3,7 +3,14 @@ use shinigami_utils::byte_array::{byte_array_value_at_le, byte_array_value_at_be
 use shinigami_utils::bytecode::{bytecode_to_hex, read_var_int, write_var_int};
 use shinigami_utils::bit_shifts::shr;
 use shinigami_utils::hash::double_sha256;
-use shinigami_engine::utxo::{UTXO};
+
+#[derive(Debug, Drop, Clone, Default)]
+pub struct UTXO {
+    pub amount: i64,
+    pub pubkey_script: ByteArray,
+    pub block_height: u32,
+    // TODO: flags?
+}
 
 // Tracks previous transaction outputs
 #[derive(Drop, Copy, Default)]
diff --git a/packages/engine/src/utxo.cairo b/packages/engine/src/utxo.cairo
deleted file mode 100644
index bd3d84a8..00000000
--- a/packages/engine/src/utxo.cairo
+++ /dev/null
@@ -1,7 +0,0 @@
-#[derive(Debug, Drop, Clone, Default)]
-pub struct UTXO {
-    pub amount: i64,
-    pub pubkey_script: ByteArray,
-    pub block_height: u32,
-    // TODO: flags?
-}
diff --git a/packages/tests/src/tests/test_coinbase.cairo b/packages/tests/src/tests/test_coinbase.cairo
index 12d223d7..8bf28eef 100644
--- a/packages/tests/src/tests/test_coinbase.cairo
+++ b/packages/tests/src/tests/test_coinbase.cairo
@@ -113,7 +113,6 @@ fn test_validate_coinbase_block_481823() {
 }
 
 #[test]
-#[ignore]
 fn test_validate_coinbase_block_481824() {
     // Test the first block after BIP141 segwit
     let raw_transaction_hex =
@@ -127,7 +126,6 @@ fn test_validate_coinbase_block_481824() {
 }
 
 #[test]
-#[ignore]
 fn test_validate_coinbase_block_538403() {
     // Test random block from learnmebitcoin
     let raw_transaction_hex =
diff --git a/packages/tests/src/tests/test_p2ms.cairo b/packages/tests/src/tests/test_p2ms.cairo
index a24817b5..0357bd9d 100644
--- a/packages/tests/src/tests/test_p2ms.cairo
+++ b/packages/tests/src/tests/test_p2ms.cairo
@@ -1,8 +1,6 @@
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
-use shinigami_engine::utxo::{UTXO};
-
-use crate::validate;
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 use shinigami_utils::bytecode::hex_to_bytecode;
+use crate::validate;
 
 #[test]
 fn test_p2ms_1_of_2() {
diff --git a/packages/tests/src/tests/test_p2pk.cairo b/packages/tests/src/tests/test_p2pk.cairo
index 28067885..10334351 100644
--- a/packages/tests/src/tests/test_p2pk.cairo
+++ b/packages/tests/src/tests/test_p2pk.cairo
@@ -1,7 +1,6 @@
 use shinigami_engine::engine::{EngineImpl};
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 use crate::validate;
-use shinigami_engine::utxo::{UTXO};
 use shinigami_utils::bytecode::hex_to_bytecode;
 
 // https://learnmeabitcoin.com/explorer/tx/cda1f7d88232ff7e4fc1fcbf8a66b2cc3b8e19b5bc0ad22618453b8b75156740
diff --git a/packages/tests/src/tests/test_p2pkh.cairo b/packages/tests/src/tests/test_p2pkh.cairo
index b6debae0..baf697ef 100644
--- a/packages/tests/src/tests/test_p2pkh.cairo
+++ b/packages/tests/src/tests/test_p2pkh.cairo
@@ -1,7 +1,6 @@
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
-use shinigami_engine::utxo::{UTXO};
-use crate::validate;
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 use shinigami_utils::bytecode::hex_to_bytecode;
+use crate::validate;
 
 #[test]
 fn test_p2pkh_transaction() {
diff --git a/packages/tests/src/tests/test_p2sh.cairo b/packages/tests/src/tests/test_p2sh.cairo
index 4df8a688..7b1aee13 100644
--- a/packages/tests/src/tests/test_p2sh.cairo
+++ b/packages/tests/src/tests/test_p2sh.cairo
@@ -1,7 +1,6 @@
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 use shinigami_engine::engine::EngineImpl;
 use shinigami_engine::hash_cache::HashCacheImpl;
-use shinigami_engine::utxo::{UTXO};
 use shinigami_engine::flags::ScriptFlags;
 use crate::validate;
 use shinigami_utils::bytecode::hex_to_bytecode;
diff --git a/packages/tests/src/tests/test_p2wpkh.cairo b/packages/tests/src/tests/test_p2wpkh.cairo
index 9c219f23..13f89db0 100644
--- a/packages/tests/src/tests/test_p2wpkh.cairo
+++ b/packages/tests/src/tests/test_p2wpkh.cairo
@@ -1,5 +1,4 @@
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
-use shinigami_engine::utxo::{UTXO};
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 use crate::validate;
 use shinigami_utils::bytecode::hex_to_bytecode;
 use shinigami_engine::flags::ScriptFlags;
diff --git a/packages/tests/src/tests/test_p2wsh.cairo b/packages/tests/src/tests/test_p2wsh.cairo
index 94f5f51a..7d9d3ab4 100644
--- a/packages/tests/src/tests/test_p2wsh.cairo
+++ b/packages/tests/src/tests/test_p2wsh.cairo
@@ -1,9 +1,8 @@
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 use shinigami_engine::flags::ScriptFlags;
 use shinigami_engine::errors::Error;
 
 use crate::validate;
-use shinigami_engine::utxo::{UTXO};
 use shinigami_utils::bytecode::hex_to_bytecode;
 
 // P2WSH with P2MS
diff --git a/packages/tests/src/tests/test_transactions.cairo b/packages/tests/src/tests/test_transactions.cairo
index 36000db1..14fda14f 100644
--- a/packages/tests/src/tests/test_transactions.cairo
+++ b/packages/tests/src/tests/test_transactions.cairo
@@ -1,5 +1,4 @@
-use shinigami_engine::transaction::EngineInternalTransactionTrait;
-use shinigami_engine::utxo::{UTXO};
+use shinigami_engine::transaction::{UTXO, EngineInternalTransactionTrait};
 
 use crate::validate;
 use shinigami_utils::byte_array::u256_from_byte_array_with_offset;
diff --git a/packages/tests/src/validate.cairo b/packages/tests/src/validate.cairo
index dcdc05df..4c665313 100644
--- a/packages/tests/src/validate.cairo
+++ b/packages/tests/src/validate.cairo
@@ -1,8 +1,7 @@
 use shinigami_engine::engine::EngineImpl;
 use shinigami_engine::hash_cache::HashCacheImpl;
-use shinigami_engine::transaction::EngineTransaction;
+use shinigami_engine::transaction::{EngineTransaction, UTXO};
 use shinigami_engine::opcodes::Opcode;
-use shinigami_engine::utxo::{UTXO};
 
 // TODO: Move validate coinbase here