diff --git a/macadamia/PersistentModels/Mint.swift b/macadamia/PersistentModels/Mint.swift
index 428c8a8..6b64914 100644
--- a/macadamia/PersistentModels/Mint.swift
+++ b/macadamia/PersistentModels/Mint.swift
@@ -100,44 +100,4 @@ extension AppSchemaV1.Mint {
             self.keysets[index] = keyset
         }
     }
-    
-    func select_v2(allProofs: [Proof], amount: Int, unit: Unit) -> (selected: [Proof], fee: Int)? {
-        let validProofs = allProofs.filter { $0.unit == unit && $0.state == .valid && $0.mint == self }
-        guard !validProofs.isEmpty else { return nil }
-        func dpSelectWithoutFee(amount: Int, proofs: [Proof]) -> [Proof]? {
-            var dp: [Int: [Proof]] = [0: []]
-            for proof in proofs {
-                let coin = proof.amount
-                for (s, subset) in dp.sorted(by: { $0.key > $1.key }) {
-                    let newSum = s + coin
-                    if dp[newSum] == nil {
-                        dp[newSum] = subset + [proof]
-                    }
-                }
-            }
-            let candidates = dp.keys.filter { $0 >= amount }
-            guard let best = candidates.min() else { return nil }
-            return dp[best]
-        }
-        func fee(for proofs: [Proof]) -> Int {
-            ((proofs.reduce(0) { $0 + $1.inputFeePPK } + 999) / 1000)
-        }
-        if validProofs.allSatisfy({ $0.inputFeePPK == 0 }) {
-            if let selection = dpSelectWithoutFee(amount: amount, proofs: validProofs) {
-                return (selection, 0)
-            }
-            return nil
-        } else {
-            guard var selected = dpSelectWithoutFee(amount: amount, proofs: validProofs) else { return nil }
-            var remaining = validProofs.filter { !selected.contains($0) }
-            remaining.sort { $0.amount < $1.amount }
-            while selected.reduce(0, { $0 + $1.amount }) < amount + fee(for: selected) {
-                guard !remaining.isEmpty else { return nil }
-                selected.append(remaining.removeFirst())
-            }
-            return (selected, fee(for: selected))
-        }
-    }
-
-    
 }
diff --git a/macadamia/PersistentModels/Operations/inputSelection.swift b/macadamia/PersistentModels/Operations/inputSelection.swift
index 3149504..7af058a 100644
--- a/macadamia/PersistentModels/Operations/inputSelection.swift
+++ b/macadamia/PersistentModels/Operations/inputSelection.swift
@@ -6,3 +6,41 @@
 //
 
 import Foundation
+
+func select_v2(allProofs: [Proof], amount: Int, unit: Unit) -> (selected: [Proof], fee: Int)? {
+    let validProofs = allProofs.filter { $0.unit == unit && $0.state == .valid && $0.mint == self }
+    guard !validProofs.isEmpty else { return nil }
+    func dpSelectWithoutFee(amount: Int, proofs: [Proof]) -> [Proof]? {
+        var dp: [Int: [Proof]] = [0: []]
+        for proof in proofs {
+            let coin = proof.amount
+            for (s, subset) in dp.sorted(by: { $0.key > $1.key }) {
+                let newSum = s + coin
+                if dp[newSum] == nil {
+                    dp[newSum] = subset + [proof]
+                }
+            }
+        }
+        let candidates = dp.keys.filter { $0 >= amount }
+        guard let best = candidates.min() else { return nil }
+        return dp[best]
+    }
+    func fee(for proofs: [Proof]) -> Int {
+        ((proofs.reduce(0) { $0 + $1.inputFeePPK } + 999) / 1000)
+    }
+    if validProofs.allSatisfy({ $0.inputFeePPK == 0 }) {
+        if let selection = dpSelectWithoutFee(amount: amount, proofs: validProofs) {
+            return (selection, 0)
+        }
+        return nil
+    } else {
+        guard var selected = dpSelectWithoutFee(amount: amount, proofs: validProofs) else { return nil }
+        var remaining = validProofs.filter { !selected.contains($0) }
+        remaining.sort { $0.amount < $1.amount }
+        while selected.reduce(0, { $0 + $1.amount }) < amount + fee(for: selected) {
+            guard !remaining.isEmpty else { return nil }
+            selected.append(remaining.removeFirst())
+        }
+        return (selected, fee(for: selected))
+    }
+}