From c1656f7660d84da2fff7116382c0bb3ec0a69e7b Mon Sep 17 00:00:00 2001
From: AntiochP <30642645+antiochp@users.noreply.github.com>
Date: Thu, 9 Nov 2017 14:26:45 -0500
Subject: [PATCH] use the static secp instance everywhere (except the wallet)
 (#250)

---
 chain/src/pipe.rs            |  4 +-
 core/src/core/block.rs       | 72 +++++++++++++++++++++---------------
 core/src/core/build.rs       | 12 ++++--
 core/src/core/mod.rs         | 49 +++++++++++++-----------
 core/src/core/transaction.rs | 27 +++++++++-----
 grin/src/miner.rs            |  4 +-
 keychain/src/keychain.rs     |  4 +-
 pool/src/pool.rs             |  4 +-
 wallet/src/receiver.rs       |  2 +-
 wallet/src/sender.rs         |  2 +-
 10 files changed, 102 insertions(+), 78 deletions(-)

diff --git a/chain/src/pipe.rs b/chain/src/pipe.rs
index f24bf6b12..2e8e04c85 100644
--- a/chain/src/pipe.rs
+++ b/chain/src/pipe.rs
@@ -16,7 +16,6 @@
 
 use std::sync::{Arc, RwLock};
 
-use util::secp;
 use time;
 
 use core::consensus;
@@ -209,8 +208,7 @@ fn validate_block(
 	}
 
 	// main isolated block validation, checks all commitment sums and sigs
-	let curve = secp::Secp256k1::with_caps(secp::ContextFlag::Commit);
-	try!(b.validate(&curve).map_err(&Error::InvalidBlockProof));
+	try!(b.validate().map_err(&Error::InvalidBlockProof));
 
 	// apply the new block to the MMR trees and check the new root hashes
 	if b.header.previous == ctx.head.last_block_h {
diff --git a/core/src/core/block.rs b/core/src/core/block.rs
index 0cd9ff149..f62900f2c 100644
--- a/core/src/core/block.rs
+++ b/core/src/core/block.rs
@@ -16,7 +16,7 @@
 
 use time;
 use util;
-use util::secp::{self, Secp256k1};
+use util::{secp, static_secp_instance};
 use std::collections::HashSet;
 
 use core::Committed;
@@ -299,8 +299,6 @@ impl Block {
 		reward_out: Output,
 		reward_kern: TxKernel,
 	) -> Result<Block, Error> {
-		let secp = Secp256k1::with_caps(secp::ContextFlag::Commit);
-
 		let mut kernels = vec![];
 		let mut inputs = vec![];
 		let mut outputs = vec![];
@@ -311,7 +309,7 @@ impl Block {
 		// to build the block (which we can sort of think of as one big tx?)
 		for tx in txs {
 			// validate each transaction and gather their kernels
-			let excess = tx.validate(&secp)?;
+			let excess = tx.validate()?;
 			let kernel = tx.build_kernel(excess);
 			kernels.push(kernel);
 
@@ -333,7 +331,7 @@ impl Block {
 		outputs.sort();
 		kernels.sort();
 
-		// calculate the overall Merkle tree and fees
+		// calculate the overall Merkle tree and fees (todo?)
 
 		Ok(
 			Block {
@@ -447,19 +445,19 @@ impl Block {
 	///
 	/// TODO - performs various verification steps - discuss renaming this to "verify"
 	///
-	pub fn validate(&self, secp: &Secp256k1) -> Result<(), Error> {
+	pub fn validate(&self) -> Result<(), Error> {
 		if exceeds_weight(self.inputs.len(), self.outputs.len(), self.kernels.len()) {
 			return Err(Error::WeightExceeded);
 		}
-		self.verify_coinbase(secp)?;
-		self.verify_kernels(secp, false)?;
+		self.verify_coinbase()?;
+		self.verify_kernels(false)?;
 		Ok(())
 	}
 
 	/// Verifies the sum of input/output commitments match the sum in kernels
 	/// and that all kernel signatures are valid.
 	/// TODO - when would we skip_sig? Is this needed or used anywhere?
-	fn verify_kernels(&self, secp: &Secp256k1, skip_sig: bool) -> Result<(), Error> {
+	fn verify_kernels(&self, skip_sig: bool) -> Result<(), Error> {
 		for k in &self.kernels {
 			if k.fee & 1 != 0 {
 				return Err(Error::OddKernelFee);
@@ -471,11 +469,16 @@ impl Block {
 		}
 
 		// sum all inputs and outs commitments
-		let io_sum = self.sum_commitments(secp)?;
+		let io_sum = self.sum_commitments()?;
 
 		// sum all kernels commitments
 		let proof_commits = map_vec!(self.kernels, |proof| proof.excess);
-		let proof_sum = secp.commit_sum(proof_commits, vec![])?;
+
+		let proof_sum = {
+			let secp = static_secp_instance();
+			let secp = secp.lock().unwrap();
+			secp.commit_sum(proof_commits, vec![])?
+		};
 
 		// both should be the same
 		if proof_sum != io_sum {
@@ -485,7 +488,7 @@ impl Block {
 		// verify all signatures with the commitment as pk
 		if !skip_sig {
 			for proof in &self.kernels {
-				proof.verify(secp)?;
+				proof.verify()?;
 			}
 		}
 		Ok(())
@@ -496,7 +499,7 @@ impl Block {
 	// * That the sum of all coinbase-marked outputs equal the supply.
 	// * That the sum of blinding factors for all coinbase-marked outputs match
 	//   the coinbase-marked kernels.
-	fn verify_coinbase(&self, secp: &Secp256k1) -> Result<(), Error> {
+	fn verify_coinbase(&self) -> Result<(), Error> {
 		let cb_outs = filter_map_vec!(self.outputs, |out| if out.features.contains(
 			COINBASE_OUTPUT,
 		)
@@ -511,10 +514,17 @@ impl Block {
 			None
 		});
 
-		let over_commit = secp.commit_value(reward(self.total_fees()))?;
-		let out_adjust_sum = secp.commit_sum(cb_outs, vec![over_commit])?;
+		let over_commit;
+		let out_adjust_sum;
+		let kerns_sum;
+		{
+			let secp = static_secp_instance();
+			let secp = secp.lock().unwrap();
+			over_commit = secp.commit_value(reward(self.total_fees()))?;
+			out_adjust_sum = secp.commit_sum(cb_outs, vec![over_commit])?;
+			kerns_sum = secp.commit_sum(cb_kerns, vec![])?;
+		}
 
-		let kerns_sum = secp.commit_sum(cb_kerns, vec![])?;
 		if kerns_sum != out_adjust_sum {
 			return Err(Error::CoinbaseSumMismatch);
 		}
@@ -527,8 +537,6 @@ impl Block {
 		key_id: &keychain::Identifier,
 		fees: u64,
 	) -> Result<(Output, TxKernel), keychain::Error> {
-		let secp = keychain.secp();
-
 		let commit = keychain.commit(reward(fees), key_id)?;
 		let switch_commit = keychain.switch_commit(key_id)?;
 		let switch_commit_hash = SwitchCommitHash::from_switch_commit(switch_commit);
@@ -553,6 +561,8 @@ impl Block {
 			proof: rproof,
 		};
 
+		let secp = static_secp_instance();
+		let secp = secp.lock().unwrap();
 		let over_commit = secp.commit_value(reward(fees))?;
 		let out_commit = output.commitment();
 		let excess = secp.commit_sum(vec![out_commit], vec![over_commit])?;
@@ -560,10 +570,12 @@ impl Block {
 		let msg = util::secp::Message::from_slice(&[0; secp::constants::MESSAGE_SIZE])?;
 		let sig = keychain.sign(&msg, &key_id)?;
 
+		let excess_sig = sig.serialize_der(&secp);
+
 		let proof = TxKernel {
 			features: COINBASE_KERNEL,
 			excess: excess,
-			excess_sig: sig.serialize_der(&secp),
+			excess_sig: excess_sig,
 			fee: 0,
 			lock_height: 0,
 		};
@@ -628,7 +640,7 @@ mod test {
 		println!("Build tx: {}", now.elapsed().as_secs());
 
 		let b = new_block(vec![&mut tx], &keychain);
-		assert!(b.validate(&keychain.secp()).is_err());
+		assert!(b.validate().is_err());
 	}
 
 	#[test]
@@ -652,7 +664,7 @@ mod test {
 
 		// block should have been automatically compacted (including reward
 		// output) and should still be valid
-		b.validate(&keychain.secp()).unwrap();
+		b.validate().unwrap();
 		assert_eq!(b.inputs.len(), 3);
 		assert_eq!(b.outputs.len(), 3);
 	}
@@ -677,10 +689,10 @@ mod test {
 		let mut btx3 = txspend1i1o(5, &keychain, key_id2.clone(), key_id3);
 
 		let b1 = new_block(vec![&mut btx1, &mut btx2], &keychain);
-		b1.validate(&keychain.secp()).unwrap();
+		b1.validate().unwrap();
 
 		let b2 = new_block(vec![&mut btx3], &keychain);
-		b2.validate(&keychain.secp()).unwrap();
+		b2.validate().unwrap();
 
 		// block should have been automatically compacted and should still be valid
 		let b3 = b1.merge(b2);
@@ -713,7 +725,7 @@ mod test {
 
 		// the block should be valid here (single coinbase output with corresponding
 		// txn kernel)
-		assert_eq!(b.validate(&keychain.secp()), Ok(()));
+		assert_eq!(b.validate(), Ok(()));
 	}
 
 	#[test]
@@ -728,13 +740,13 @@ mod test {
 		b.outputs[0].features.remove(COINBASE_OUTPUT);
 
 		assert_eq!(
-			b.verify_coinbase(&keychain.secp()),
+			b.verify_coinbase(),
 			Err(Error::CoinbaseSumMismatch)
 		);
-		assert_eq!(b.verify_kernels(&keychain.secp(), false), Ok(()));
+		assert_eq!(b.verify_kernels(false), Ok(()));
 
 		assert_eq!(
-			b.validate(&keychain.secp()),
+			b.validate(),
 			Err(Error::CoinbaseSumMismatch)
 		);
 	}
@@ -750,13 +762,13 @@ mod test {
 		b.kernels[0].features.remove(COINBASE_KERNEL);
 
 		assert_eq!(
-			b.verify_coinbase(&keychain.secp()),
+			b.verify_coinbase(),
 			Err(Error::Secp(secp::Error::IncorrectCommitSum))
 		);
-		assert_eq!(b.verify_kernels(&keychain.secp(), true), Ok(()));
+		assert_eq!(b.verify_kernels(true), Ok(()));
 
 		assert_eq!(
-			b.validate(&keychain.secp()),
+			b.validate(),
 			Err(Error::Secp(secp::Error::IncorrectCommitSum))
 		);
 	}
diff --git a/core/src/core/build.rs b/core/src/core/build.rs
index aeeba36eb..90044d79c 100644
--- a/core/src/core/build.rs
+++ b/core/src/core/build.rs
@@ -25,7 +25,7 @@
 //! build::transaction(vec![input_rand(75), output_rand(42), output_rand(32),
 //!   with_fee(1)])
 
-use util::secp;
+use util::{secp, static_secp_instance};
 
 use core::{Input, Output, SwitchCommitHash, Transaction, DEFAULT_OUTPUT};
 use core::transaction::kernel_sig_msg;
@@ -139,7 +139,11 @@ pub fn transaction(
 	let blind_sum = ctx.keychain.blind_sum(&sum)?;
 	let msg = secp::Message::from_slice(&kernel_sig_msg(tx.fee, tx.lock_height))?;
 	let sig = ctx.keychain.sign_with_blinding(&msg, &blind_sum)?;
-	tx.excess_sig = sig.serialize_der(&ctx.keychain.secp());
+
+	let secp = static_secp_instance();
+	let secp = secp.lock().unwrap();
+	tx.excess_sig = sig.serialize_der(&secp);
+
 	Ok((tx, blind_sum))
 }
 
@@ -165,7 +169,7 @@ mod test {
 			&keychain,
 		).unwrap();
 
-		tx.verify_sig(&keychain.secp()).unwrap();
+		tx.verify_sig().unwrap();
 	}
 
 	#[test]
@@ -179,6 +183,6 @@ mod test {
 			&keychain,
 		).unwrap();
 
-		tx.verify_sig(&keychain.secp()).unwrap();
+		tx.verify_sig().unwrap();
 	}
 }
diff --git a/core/src/core/mod.rs b/core/src/core/mod.rs
index a0167a0b2..798da30a3 100644
--- a/core/src/core/mod.rs
+++ b/core/src/core/mod.rs
@@ -28,7 +28,7 @@ use std::cmp::Ordering;
 use std::num::ParseFloatError;
 use consensus::GRIN_BASE;
 
-use util::secp::{self, Secp256k1};
+use util::{secp, static_secp_instance};
 use util::secp::pedersen::*;
 
 pub use self::block::*;
@@ -36,18 +36,17 @@ pub use self::transaction::*;
 use self::hash::Hashed;
 use ser::{Error, Readable, Reader, Writeable, Writer};
 use global;
-// use keychain;
 
 /// Implemented by types that hold inputs and outputs including Pedersen
 /// commitments. Handles the collection of the commitments as well as their
 /// summing, taking potential explicit overages of fees into account.
 pub trait Committed {
 	/// Gathers commitments and sum them.
-	fn sum_commitments(&self, secp: &Secp256k1) -> Result<Commitment, secp::Error> {
+	fn sum_commitments(&self) -> Result<Commitment, secp::Error> {
 		// first, verify each range proof
 		let ref outputs = self.outputs_committed();
 		for output in *outputs {
-			try!(output.verify_proof(secp))
+			try!(output.verify_proof())
 		}
 
 		// then gather the commitments
@@ -58,7 +57,11 @@ pub trait Committed {
 		// negative
 		let overage = self.overage();
 		if overage != 0 {
-			let over_commit = secp.commit_value(overage.abs() as u64).unwrap();
+			let over_commit = {
+				let secp = static_secp_instance();
+				let secp = secp.lock().unwrap();
+				secp.commit_value(overage.abs() as u64).unwrap()
+			};
 			if overage < 0 {
 				input_commits.push(over_commit);
 			} else {
@@ -67,7 +70,11 @@ pub trait Committed {
 		}
 
 		// sum all that stuff
-		secp.commit_sum(output_commits, input_commits)
+		{
+			let secp = static_secp_instance();
+			let secp = secp.lock().unwrap();
+			secp.commit_sum(output_commits, input_commits)
+		}
 	}
 
 	/// Vector of committed inputs to verify
@@ -310,14 +317,16 @@ mod test {
 
 	#[test]
 	fn blind_tx() {
-		let keychain = Keychain::from_random_seed().unwrap();
-
 		let btx = tx2i1o();
-		btx.verify_sig(&keychain.secp()).unwrap(); // unwrap will panic if invalid
+		btx.verify_sig().unwrap(); // unwrap will panic if invalid
 
 		// checks that the range proof on our blind output is sufficiently hiding
 		let Output { proof, .. } = btx.outputs[0];
-		let info = &keychain.secp().range_proof_info(proof);
+
+		let secp = static_secp_instance();
+		let secp = secp.lock().unwrap();
+		let info = secp.range_proof_info(proof);
+
 		assert!(info.min == 0);
 		assert!(info.max == u64::max_value());
 	}
@@ -371,7 +380,7 @@ mod test {
 			&keychain,
 		).unwrap();
 
-		tx_final.validate(&keychain.secp()).unwrap();
+		tx_final.validate().unwrap();
 	}
 
 	#[test]
@@ -380,7 +389,7 @@ mod test {
 		let key_id = keychain.derive_key_id(1).unwrap();
 
 		let b = Block::new(&BlockHeader::default(), vec![], &keychain, &key_id).unwrap();
-		b.compact().validate(&keychain.secp()).unwrap();
+		b.compact().validate().unwrap();
 	}
 
 	#[test]
@@ -389,10 +398,10 @@ mod test {
 		let key_id = keychain.derive_key_id(1).unwrap();
 
 		let mut tx1 = tx2i1o();
-		tx1.verify_sig(keychain.secp()).unwrap();
+		tx1.verify_sig().unwrap();
 
 		let b = Block::new(&BlockHeader::default(), vec![&mut tx1], &keychain, &key_id).unwrap();
-		b.compact().validate(keychain.secp()).unwrap();
+		b.compact().validate().unwrap();
 	}
 
 	#[test]
@@ -409,7 +418,7 @@ mod test {
 			&keychain,
 			&key_id,
 		).unwrap();
-		b.validate(keychain.secp()).unwrap();
+		b.validate().unwrap();
 	}
 
 	#[test]
@@ -439,7 +448,7 @@ mod test {
 			&keychain,
 			&key_id3.clone(),
 		).unwrap();
-		b.validate(keychain.secp()).unwrap();
+		b.validate().unwrap();
 
 		// now try adding a timelocked tx where lock height is greater than current block height
 		let tx1 = build::transaction(
@@ -459,7 +468,7 @@ mod test {
 			&keychain,
 			&key_id3.clone(),
 		).unwrap();
-		match b.validate(keychain.secp()) {
+		match b.validate() {
 			Err(KernelLockHeight { lock_height: height }) => {
 				assert_eq!(height, 2);
 			}
@@ -469,16 +478,14 @@ mod test {
 
 	#[test]
 	pub fn test_verify_1i1o_sig() {
-		let keychain = keychain::Keychain::from_random_seed().unwrap();
 		let tx = tx1i1o();
-		tx.verify_sig(keychain.secp()).unwrap();
+		tx.verify_sig().unwrap();
 	}
 
 	#[test]
 	pub fn test_verify_2i1o_sig() {
-		let keychain = keychain::Keychain::from_random_seed().unwrap();
 		let tx = tx2i1o();
-		tx.verify_sig(keychain.secp()).unwrap();
+		tx.verify_sig().unwrap();
 	}
 
 	// utility producing a transaction with 2 inputs and a single outputs
diff --git a/core/src/core/transaction.rs b/core/src/core/transaction.rs
index 499232de5..4df725e91 100644
--- a/core/src/core/transaction.rs
+++ b/core/src/core/transaction.rs
@@ -16,7 +16,7 @@
 
 use byteorder::{BigEndian, ByteOrder};
 use blake2::blake2b::blake2b;
-use util::secp::{self, Message, Secp256k1, Signature};
+use util::secp::{self, Message, Signature};
 use util::static_secp_instance;
 use util::secp::pedersen::{Commitment, RangeProof};
 use std::cmp::Ordering;
@@ -147,11 +147,13 @@ impl TxKernel {
 	/// Verify the transaction proof validity. Entails handling the commitment
 	/// as a public key and checking the signature verifies with the fee as
 	/// message.
-	pub fn verify(&self, secp: &Secp256k1) -> Result<(), secp::Error> {
+	pub fn verify(&self) -> Result<(), secp::Error> {
 		let msg = try!(Message::from_slice(
 			&kernel_sig_msg(self.fee, self.lock_height),
 		));
-		let sig = try!(Signature::from_der(secp, &self.excess_sig));
+		let secp = static_secp_instance();
+		let secp = secp.lock().unwrap();
+		let sig = try!(Signature::from_der(&secp, &self.excess_sig));
 		secp.verify_from_commit(&msg, &sig, &self.excess)
 	}
 }
@@ -306,11 +308,14 @@ impl Transaction {
 	/// sum to zero as they should in r.G + v.H then only k.G the excess
 	/// of the sum of r.G should be left. And r.G is the definition of a
 	/// public key generated using r as a private key.
-	pub fn verify_sig(&self, secp: &Secp256k1) -> Result<Commitment, secp::Error> {
-		let rsum = self.sum_commitments(secp)?;
+	pub fn verify_sig(&self) -> Result<Commitment, secp::Error> {
+		let rsum = self.sum_commitments()?;
 
 		let msg = Message::from_slice(&kernel_sig_msg(self.fee, self.lock_height))?;
-		let sig = Signature::from_der(secp, &self.excess_sig)?;
+
+		let secp = static_secp_instance();
+		let secp = secp.lock().unwrap();
+		let sig = Signature::from_der(&secp, &self.excess_sig)?;
 
 		// pretend the sum is a public key (which it is, being of the form r.G) and
 		// verify the transaction sig with it
@@ -338,14 +343,14 @@ impl Transaction {
 	/// Validates all relevant parts of a fully built transaction. Checks the
 	/// excess value against the signature as well as range proofs for each
 	/// output.
-	pub fn validate(&self, secp: &Secp256k1) -> Result<Commitment, Error> {
+	pub fn validate(&self) -> Result<Commitment, Error> {
 		if self.fee & 1 != 0 {
 			return Err(Error::OddFee);
 		}
 		for out in &self.outputs {
-			out.verify_proof(secp)?;
+			out.verify_proof()?;
 		}
-		let excess = self.verify_sig(secp)?;
+		let excess = self.verify_sig()?;
 		Ok(excess)
 	}
 }
@@ -514,7 +519,9 @@ impl Output {
 	}
 
 	/// Validates the range proof using the commitment
-	pub fn verify_proof(&self, secp: &Secp256k1) -> Result<(), secp::Error> {
+	pub fn verify_proof(&self) -> Result<(), secp::Error> {
+		let secp = static_secp_instance();
+		let secp = secp.lock().unwrap();
 		secp.verify_range_proof(self.commit, self.proof).map(|_| ())
 	}
 
diff --git a/grin/src/miner.rs b/grin/src/miner.rs
index 8627b53b9..4d1730e61 100644
--- a/grin/src/miner.rs
+++ b/grin/src/miner.rs
@@ -37,7 +37,6 @@ use util::LOGGER;
 use types::Error;
 
 use chain;
-use util::secp;
 use pool;
 use util;
 use keychain::{Identifier, Keychain};
@@ -574,8 +573,7 @@ impl Miner {
 		);
 
 		// making sure we're not spending time mining a useless block
-		let secp = secp::Secp256k1::with_caps(secp::ContextFlag::Commit);
-		b.validate(&secp).expect("Built an invalid block!");
+		b.validate().expect("Built an invalid block!");
 
 		let mut rng = rand::OsRng::new().unwrap();
 		b.header.nonce = rng.gen();
diff --git a/keychain/src/keychain.rs b/keychain/src/keychain.rs
index d5297f387..aa50e8b09 100644
--- a/keychain/src/keychain.rs
+++ b/keychain/src/keychain.rs
@@ -100,7 +100,7 @@ impl Keychain {
 		}
 
 		trace!(LOGGER, "Derived Key key_id: {}", key_id);
-		
+
 		if let Some(n) = n_child{
 			let extkey = self.extkey.derive(&self.secp, n)?;
 			return Ok(extkey.key);
@@ -222,8 +222,8 @@ mod test {
 
 	#[test]
 	fn test_key_derivation() {
-		let secp = secp::Secp256k1::with_caps(secp::ContextFlag::Commit);
 		let keychain = Keychain::from_random_seed().unwrap();
+		let secp = keychain.secp();
 
 		// use the keychain to derive a "key_id" based on the underlying seed
 		let key_id = keychain.derive_key_id(1).unwrap();
diff --git a/pool/src/pool.rs b/pool/src/pool.rs
index 9d8086b8e..a6bd121dd 100644
--- a/pool/src/pool.rs
+++ b/pool/src/pool.rs
@@ -22,7 +22,6 @@ use core::core::block;
 use core::core::hash;
 use core::global;
 
-use util::secp;
 use util::secp::pedersen::Commitment;
 
 use std::sync::Arc;
@@ -145,8 +144,7 @@ where
 		}
 
 		// Making sure the transaction is valid before anything else.
-		let secp = secp::Secp256k1::with_caps(secp::ContextFlag::Commit);
-		tx.validate(&secp).map_err(|_e| PoolError::Invalid)?;
+		tx.validate().map_err(|_e| PoolError::Invalid)?;
 
 		// The first check involves ensuring that an identical transaction is
   // not already in the pool's transaction set.
diff --git a/wallet/src/receiver.rs b/wallet/src/receiver.rs
index 5428466d1..7eb015cbf 100644
--- a/wallet/src/receiver.rs
+++ b/wallet/src/receiver.rs
@@ -205,7 +205,7 @@ fn receive_transaction(
 
 	// make sure the resulting transaction is valid (could have been lied to on
  // excess).
-	tx_final.validate(&keychain.secp())?;
+	tx_final.validate()?;
 
 	// operate within a lock on wallet data
 	WalletData::with_wallet(&config.data_file_dir, |wallet_data| {
diff --git a/wallet/src/sender.rs b/wallet/src/sender.rs
index 8b3dcfea5..a583a3a4f 100644
--- a/wallet/src/sender.rs
+++ b/wallet/src/sender.rs
@@ -135,7 +135,7 @@ pub fn issue_burn_tx(
 
 	// finalize the burn transaction and send
 	let (tx_burn, _) = build::transaction(parts, &keychain)?;
-	tx_burn.validate(&keychain.secp())?;
+	tx_burn.validate()?;
 
 	let tx_hex = util::to_hex(ser::ser_vec(&tx_burn).unwrap());
 	let url = format!("{}/v1/pool/push", config.check_node_api_http_addr.as_str());