type-hint some Callables

diff --git a/electrum/coinchooser.py b/electrum/coinchooser.py
index ae97d7d..843470f 100644
--- a/electrum/coinchooser.py
+++ b/electrum/coinchooser.py
@@ -90,7 +90,7 @@ class ScoredCandidate(NamedTuple):
     buckets: List[Bucket]
 
 
-def strip_unneeded(bkts: List[Bucket], sufficient_funds) -> List[Bucket]:
+def strip_unneeded(bkts: List[Bucket], sufficient_funds: Callable) -> List[Bucket]:
     '''Remove buckets that are unnecessary in achieving the spend amount'''
     if sufficient_funds([], bucket_value_sum=0):
         # none of the buckets are needed
@@ -113,7 +113,12 @@ class CoinChooserBase(Logger):
     def keys(self, coins: Sequence[PartialTxInput]) -> Sequence[str]:
         raise NotImplementedError
 
-    def bucketize_coins(self, coins: Sequence[PartialTxInput], *, fee_estimator_vb):
+    def bucketize_coins(
+        self,
+        coins: Sequence[PartialTxInput],
+        *,
+        fee_estimator_vb: Callable[[int | float | Decimal], int],
+    ):
         keys = self.keys(coins)
         buckets = defaultdict(list)  # type: Dict[str, List[PartialTxInput]]
         for key, coin in zip(keys, coins):
@@ -151,9 +156,12 @@ class CoinChooserBase(Logger):
 
         return list(map(make_Bucket, buckets.keys(), buckets.values()))
 
-    def penalty_func(self, base_tx, *,
-                     tx_from_buckets: Callable[[List[Bucket]], Tuple[PartialTransaction, List[PartialTxOutput]]]) \
-            -> Callable[[List[Bucket]], ScoredCandidate]:
+    def penalty_func(
+        self,
+        base_tx: Transaction,
+        *,
+        tx_from_buckets: Callable[[List[Bucket]], Tuple[PartialTransaction, List[PartialTxOutput]]],
+    ) -> Callable[[List[Bucket]], ScoredCandidate]:
         raise NotImplementedError
 
     def _change_amounts(self, tx: PartialTransaction, count: int, fee_estimator_numchange) -> List[int]:
@@ -282,7 +290,7 @@ class CoinChooserBase(Logger):
             inputs: List[PartialTxInput],
             outputs: List[PartialTxOutput],
             change_addrs: Sequence[str],
-            fee_estimator_vb: Callable,
+            fee_estimator_vb: Callable[[int | float | Decimal], int],
             dust_threshold: int,
             BIP69_sort: bool = True,
     ) -> PartialTransaction:
@@ -322,7 +330,7 @@ class CoinChooserBase(Logger):
         def fee_estimator_w(weight):
             return fee_estimator_vb(Transaction.virtual_size_from_weight(weight))
 
-        def sufficient_funds(buckets, *, bucket_value_sum):
+        def sufficient_funds(buckets: List[Bucket], *, bucket_value_sum: int) -> bool:
             '''Given a list of buckets, return True if it has enough
             value to pay for the transaction'''
             # assert bucket_value_sum == sum(bucket.value for bucket in buckets)  # expensive!
@@ -373,7 +381,11 @@ class CoinChooserBase(Logger):
 
 class CoinChooserRandom(CoinChooserBase):
 
-    def bucket_candidates_any(self, buckets: List[Bucket], sufficient_funds) -> List[List[Bucket]]:
+    def bucket_candidates_any(
+        self,
+        buckets: List[Bucket],
+        sufficient_funds: Callable,
+    ) -> List[List[Bucket]]:
         '''Returns a list of bucket sets.'''
         if not buckets:
             if sufficient_funds([], bucket_value_sum=0):
@@ -411,8 +423,11 @@ class CoinChooserRandom(CoinChooserBase):
         candidates = [[buckets[n] for n in c] for c in candidates]
         return [strip_unneeded(c, sufficient_funds) for c in candidates]
 
-    def bucket_candidates_prefer_confirmed(self, buckets: List[Bucket],
-                                           sufficient_funds) -> List[List[Bucket]]:
+    def bucket_candidates_prefer_confirmed(
+        self,
+        buckets: List[Bucket],
+        sufficient_funds: Callable,
+    ) -> List[List[Bucket]]:
         """Returns a list of bucket sets preferring confirmed coins.
 
         Any bucket can be:
@@ -435,7 +450,7 @@ class CoinChooserRandom(CoinChooserBase):
         for bkts_choose_from in bucket_sets:
             try:
                 def sfunds(
-                    bkts, *, bucket_value_sum,
+                    bkts: List[Bucket], *, bucket_value_sum: int,
                     already_selected_buckets_value_sum=already_selected_buckets_value_sum,
                     already_selected_buckets=already_selected_buckets,
                 ):
diff --git a/electrum/lnpeer.py b/electrum/lnpeer.py
index cdea45f..3b516ec 100644
--- a/electrum/lnpeer.py
+++ b/electrum/lnpeer.py
@@ -2352,8 +2352,8 @@ class Peer(Logger, EventListener):
             chan: Channel,
             htlc: UpdateAddHtlc,
             processed_onion: ProcessedOnionPacket,
-            log_fail_reason: Callable,
-    ):
+            log_fail_reason: Callable[[str], None],
+    ) -> tuple[bytes, int, int, OnionRoutingFailure]:
         """
         Perform checks that are invariant (results do not depend on height, network conditions, etc).
         May raise OnionRoutingFailure
@@ -2379,13 +2379,13 @@ class Peer(Logger, EventListener):
                 code=OnionFailureCode.FINAL_INCORRECT_CLTV_EXPIRY,
                 data=htlc.cltv_abs.to_bytes(4, byteorder="big"))
         try:
-            total_msat = processed_onion.hop_data.payload["payment_data"]["total_msat"]
+            total_msat = processed_onion.hop_data.payload["payment_data"]["total_msat"]  # type: int
         except Exception:
             log_fail_reason(f"'total_msat' missing from onion")
             raise exc_incorrect_or_unknown_pd
 
         if chan.opening_fee:
-            channel_opening_fee = chan.opening_fee['channel_opening_fee']
+            channel_opening_fee = chan.opening_fee['channel_opening_fee']  # type: int
             total_msat -= channel_opening_fee
             amt_to_forward -= channel_opening_fee
         else:
@@ -2405,7 +2405,16 @@ class Peer(Logger, EventListener):
 
         return payment_secret_from_onion, total_msat, channel_opening_fee, exc_incorrect_or_unknown_pd
 
-    def check_mpp_is_waiting(self, *, payment_secret, short_channel_id, htlc, expected_msat, exc_incorrect_or_unknown_pd, log_fail_reason) -> bool:
+    def check_mpp_is_waiting(
+        self,
+        *,
+        payment_secret: bytes,
+        short_channel_id: ShortChannelID,
+        htlc: UpdateAddHtlc,
+        expected_msat: int,
+        exc_incorrect_or_unknown_pd: OnionRoutingFailure,
+        log_fail_reason: Callable[[str], None],
+    ) -> bool:
         from .lnworker import RecvMPPResolution
         mpp_resolution = self.lnworker.check_mpp_status(
             payment_secret=payment_secret,
diff --git a/electrum/plugins/psbt_nostr/psbt_nostr.py b/electrum/plugins/psbt_nostr/psbt_nostr.py
index b084c0e..bcafa3d 100644
--- a/electrum/plugins/psbt_nostr/psbt_nostr.py
+++ b/electrum/plugins/psbt_nostr/psbt_nostr.py
@@ -275,8 +275,8 @@ class CosignerWallet(Logger):
         tx: Union['Transaction', 'PartialTransaction'],
         *,
         label: str = None,
-        on_failure: Callable = None,
-        on_success: Callable = None
+        on_failure: Callable[[str], None] = None,
+        on_success: Callable[[], None] = None
     ) -> None:
         try:
             # TODO: adding tx should be handled more gracefully here:
diff --git a/electrum/transaction.py b/electrum/transaction.py
index 8bbae09..cdab347 100644
--- a/electrum/transaction.py
+++ b/electrum/transaction.py
@@ -29,7 +29,7 @@ import struct
 import io
 import base64
 from typing import (
-    Sequence, Union, NamedTuple, Tuple, Optional, Iterable, Callable, List, Dict, Set, TYPE_CHECKING, Mapping
+    Sequence, Union, NamedTuple, Tuple, Optional, Iterable, Callable, List, Dict, Set, TYPE_CHECKING, Mapping, Any
 )
 from collections import defaultdict
 from enum import IntEnum
@@ -703,7 +703,7 @@ def script_GetOp(_bytes : bytes):
 
 
 class OPPushDataGeneric:
-    def __init__(self, pushlen: Callable=None):
+    def __init__(self, pushlen: Callable[[int], bool] | None = None):
         if pushlen is not None:
             self.check_data_len = pushlen
 
@@ -721,7 +721,7 @@ class OPPushDataGeneric:
 
 
 class OPGeneric:
-    def __init__(self, matcher: Callable = None):
+    def __init__(self, matcher: Callable[[Any], bool] | None = None):
         if matcher is not None:
             self.matcher = matcher
 
@@ -729,7 +729,7 @@ class OPGeneric:
         return self.matcher(op)
 
     @classmethod
-    def is_instance(cls, item):
+    def is_instance(cls, item) -> bool:
         # accept objects that are instances of this class
         # or other classes that are subclasses
         return isinstance(item, cls) \
diff --git a/electrum/util.py b/electrum/util.py
index 0105ef3..033283e 100644
--- a/electrum/util.py
+++ b/electrum/util.py
@@ -1742,7 +1742,7 @@ def _set_custom_task_factory(loop: asyncio.AbstractEventLoop):
     loop.set_task_factory(factory)
 
 
-def run_sync_function_on_asyncio_thread(func: Callable, *, block: bool) -> None:
+def run_sync_function_on_asyncio_thread(func: Callable[[], Any], *, block: bool) -> None:
     """Run a non-async fn on the asyncio thread. Can be called from any thread.
 
     If the current thread is already the asyncio thread, func is guaranteed