From e98f14387d9e7fabefafa10b03a99f090b573e1b Mon Sep 17 00:00:00 2001
From: Sebastian Geisler <sebastian@blockstream.io>
Date: Thu, 4 Feb 2021 22:15:26 +0100
Subject: [PATCH] Add function to check RBF-ness of transactions

---
 src/blockdata/transaction.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/blockdata/transaction.rs b/src/blockdata/transaction.rs
index 07f0736403..f5147a7873 100644
--- a/src/blockdata/transaction.rs
+++ b/src/blockdata/transaction.rs
@@ -482,6 +482,13 @@ impl Transaction {
     pub fn is_coin_base(&self) -> bool {
         self.input.len() == 1 && self.input[0].previous_output.is_null()
     }
+
+    /// Returns `true` if the transaction itself opted in to be BIP-125-replaceable (RBF). This
+    /// **does not** cover the case where a transaction becomes replaceable due to ancestors being
+    /// RBF.
+    pub fn is_explicitly_rbf(&self) -> bool {
+        self.input.iter().any(|input| input.sequence < (0xffffffff - 1))
+    }
 }
 
 impl_consensus_encoding!(TxOut, value, script_pubkey);