From 53ee3a5f802660e433f60f5de7f85a08836502e1 Mon Sep 17 00:00:00 2001
From: Jack Robison <jackrobison@lbry.io>
Date: Wed, 5 May 2021 16:17:32 -0400
Subject: [PATCH] claim activations and takeovers (WIP)

---
 lbry/schema/result.py                 |   5 +-
 lbry/wallet/server/block_processor.py | 281 ++++++++++++++++++++++----
 lbry/wallet/server/db/__init__.py     |   3 +
 lbry/wallet/server/db/claimtrie.py    | 111 +++++++++-
 lbry/wallet/server/db/prefixes.py     | 123 +++++++++--
 lbry/wallet/server/leveldb.py         | 173 +++++++++++-----
 6 files changed, 572 insertions(+), 124 deletions(-)

diff --git a/lbry/schema/result.py b/lbry/schema/result.py
index ff21edeaf..b2c3b83a5 100644
--- a/lbry/schema/result.py
+++ b/lbry/schema/result.py
@@ -174,7 +174,6 @@ class Outputs:
 
     @classmethod
     def to_bytes(cls, txo_rows, extra_txo_rows, offset=0, total=None, blocked: Censor = None) -> bytes:
-        extra_txo_rows = {row['claim_hash']: row for row in extra_txo_rows}
         page = OutputsMessage()
         page.offset = offset
         if total is not None:
@@ -221,7 +220,7 @@ class Outputs:
 
         if resolve_result.canonical_url is not None:
             txo_message.claim.canonical_url = resolve_result.canonical_url
-        if resolve_result.last_take_over_height is not None:
-            txo_message.claim.take_over_height = resolve_result.last_take_over_height
+        if resolve_result.last_takeover_height is not None:
+            txo_message.claim.take_over_height = resolve_result.last_takeover_height
         if resolve_result.claims_in_channel is not None:
             txo_message.claim.claims_in_channel = resolve_result.claims_in_channel
diff --git a/lbry/wallet/server/block_processor.py b/lbry/wallet/server/block_processor.py
index 64e060c57..ed58903ed 100644
--- a/lbry/wallet/server/block_processor.py
+++ b/lbry/wallet/server/block_processor.py
@@ -18,6 +18,9 @@ from lbry.crypto.hash import hash160
 from lbry.wallet.server.leveldb import FlushData
 from lbry.wallet.server.db import DB_PREFIXES
 from lbry.wallet.server.db.claimtrie import StagedClaimtrieItem, StagedClaimtrieSupport, get_expiration_height
+from lbry.wallet.server.db.claimtrie import get_takeover_name_ops, get_force_activate_ops, get_delay_for_name
+from lbry.wallet.server.db.prefixes import PendingClaimActivationPrefixRow, Prefixes
+from lbry.wallet.server.db.revertable import RevertablePut
 from lbry.wallet.server.udp import StatusServer
 if typing.TYPE_CHECKING:
     from lbry.wallet.server.leveldb import LevelDB
@@ -202,13 +205,12 @@ class BlockProcessor:
         self.history_cache = {}
         self.status_server = StatusServer()
         self.effective_amount_changes = defaultdict(list)
-        self.pending_claims = {}
-        self.pending_claim_txos = {}
+        self.pending_claims: typing.Dict[Tuple[int, int], StagedClaimtrieItem] = {}
+        self.pending_claim_txos: typing.Dict[bytes, Tuple[int, int]] = {}
         self.pending_supports = defaultdict(set)
         self.pending_support_txos = {}
         self.pending_abandon = set()
-
-
+        self.staged_pending_abandoned = {}
 
     async def run_in_thread_with_lock(self, func, *args):
         # Run in a thread to prevent blocking.  Shielded so that
@@ -239,7 +241,6 @@ class BlockProcessor:
             try:
                 for block in blocks:
                     await self.run_in_thread_with_lock(self.advance_block, block)
-                    print("advanced\n")
             except:
                 self.logger.exception("advance blocks failed")
                 raise
@@ -412,7 +413,8 @@ class BlockProcessor:
         return None
 
     def _add_claim_or_update(self, height: int, txo, script, tx_hash: bytes, idx: int, tx_count: int, txout,
-                             spent_claims: typing.Dict[bytes, typing.Tuple[int, int, str]]) -> List['RevertableOp']:
+                             spent_claims: typing.Dict[bytes, typing.Tuple[int, int, str]],
+                             zero_delay_claims: typing.Dict[Tuple[str, bytes], Tuple[int, int]]) -> List['RevertableOp']:
         try:
             claim_name = txo.normalized_name
         except UnicodeDecodeError:
@@ -425,7 +427,13 @@ class BlockProcessor:
 
         signing_channel_hash = None
         channel_claims_count = 0
-        activation_height = 0
+        activation_delay = self.db.get_activation_delay(claim_hash, claim_name)
+        if activation_delay == 0:
+            zero_delay_claims[(claim_name, claim_hash)] = tx_count, idx
+        # else:
+        #     print("delay activation ", claim_name, activation_delay, height)
+
+        activation_height = activation_delay + height
         try:
             signable = txo.signable
         except:  # google.protobuf.message.DecodeError: Could not parse JSON.
@@ -455,9 +463,13 @@ class BlockProcessor:
                 root_idx = previous_claim.root_claim_tx_position
                 # prev_amount = previous_claim.amount
             else:
-                root_tx_num, root_idx, prev_amount, _, _, _ = self.db.get_root_claim_txo_and_current_amount(
+                k, v = self.db.get_root_claim_txo_and_current_amount(
                     claim_hash
                 )
+                root_tx_num = v.root_tx_num
+                root_idx = v.root_position
+                prev_amount = v.amount
+
         pending = StagedClaimtrieItem(
             claim_name, claim_hash, txout.value, support_amount + txout.value,
             activation_height, get_expiration_height(height), tx_count, idx, root_tx_num, root_idx,
@@ -469,11 +481,25 @@ class BlockProcessor:
         self.effective_amount_changes[claim_hash].append(txout.value)
         return pending.get_add_claim_utxo_ops()
 
-    def _add_support(self, txo, txout, idx, tx_count) -> List['RevertableOp']:
+    def _add_support(self, height, txo, txout, idx, tx_count,
+                     zero_delay_claims: typing.Dict[Tuple[str, bytes], Tuple[int, int]]) -> List['RevertableOp']:
         supported_claim_hash = txo.claim_hash[::-1]
 
+        claim_info = self.db.get_root_claim_txo_and_current_amount(
+            supported_claim_hash
+        )
+        controlling_claim = None
+        supported_tx_num = supported_position = supported_activation_height = supported_name = None
+        if claim_info:
+            k, v = claim_info
+            supported_name = v.name
+            supported_tx_num = k.tx_num
+            supported_position = k.position
+            supported_activation_height = v.activation
+            controlling_claim = self.db.get_controlling_claim(v.name)
+
         if supported_claim_hash in self.effective_amount_changes:
-            # print(f"\tsupport claim {supported_claim_hash.hex()} {starting_amount}+{txout.value}={starting_amount + txout.value}")
+            # print(f"\tsupport claim {supported_claim_hash.hex()} {txout.value}")
             self.effective_amount_changes[supported_claim_hash].append(txout.value)
             self.pending_supports[supported_claim_hash].add((tx_count, idx))
             self.pending_support_txos[(tx_count, idx)] = supported_claim_hash, txout.value
@@ -481,42 +507,84 @@ class BlockProcessor:
                 supported_claim_hash, tx_count, idx, txout.value
             ).get_add_support_utxo_ops()
         elif supported_claim_hash not in self.pending_claims and supported_claim_hash not in self.pending_abandon:
-            if self.db.claim_exists(supported_claim_hash):
-                _, _, _, name, supported_tx_num, supported_pos = self.db.get_root_claim_txo_and_current_amount(
-                    supported_claim_hash
-                )
+            # print(f"\tsupport claim {supported_claim_hash.hex()} {txout.value}")
+            ops = []
+            if claim_info:
                 starting_amount = self.db.get_effective_amount(supported_claim_hash)
+
                 if supported_claim_hash not in self.effective_amount_changes:
                     self.effective_amount_changes[supported_claim_hash].append(starting_amount)
                 self.effective_amount_changes[supported_claim_hash].append(txout.value)
+                supported_amount = self._get_pending_effective_amount(supported_claim_hash)
+
+                if controlling_claim and supported_claim_hash != controlling_claim.claim_hash:
+                    if supported_amount + txo.amount > self._get_pending_effective_amount(controlling_claim.claim_hash):
+                        # takeover could happen
+                        if (supported_name, supported_claim_hash) not in zero_delay_claims:
+                            takeover_delay = get_delay_for_name(height - supported_activation_height)
+                            if takeover_delay == 0:
+                                zero_delay_claims[(supported_name, supported_claim_hash)] = (
+                                    supported_tx_num, supported_position
+                                )
+                            else:
+                                ops.append(
+                                    RevertablePut(
+                                        *Prefixes.pending_activation.pack_item(
+                                            height + takeover_delay, supported_tx_num, supported_position,
+                                            supported_claim_hash, supported_name
+                                        )
+                                    )
+                                )
+
                 self.pending_supports[supported_claim_hash].add((tx_count, idx))
                 self.pending_support_txos[(tx_count, idx)] = supported_claim_hash, txout.value
                 # print(f"\tsupport claim {supported_claim_hash.hex()} {starting_amount}+{txout.value}={starting_amount + txout.value}")
-                return StagedClaimtrieSupport(
+                ops.extend(StagedClaimtrieSupport(
                     supported_claim_hash, tx_count, idx, txout.value
-                ).get_add_support_utxo_ops()
+                ).get_add_support_utxo_ops())
+                return ops
             else:
                 print(f"\tthis is a wonky tx, contains unlinked support for non existent {supported_claim_hash.hex()}")
         return []
 
     def _add_claim_or_support(self, height: int, tx_hash: bytes, tx_count: int, idx: int, txo, txout, script,
-                              spent_claims: typing.Dict[bytes, Tuple[int, int, str]]) -> List['RevertableOp']:
+                              spent_claims: typing.Dict[bytes, Tuple[int, int, str]],
+                              zero_delay_claims: typing.Dict[Tuple[str, bytes], Tuple[int, int]]) -> List['RevertableOp']:
         if script.is_claim_name or script.is_update_claim:
-            return self._add_claim_or_update(height, txo, script, tx_hash, idx, tx_count, txout, spent_claims)
+            return self._add_claim_or_update(height, txo, script, tx_hash, idx, tx_count, txout, spent_claims,
+                                             zero_delay_claims)
         elif script.is_support_claim or script.is_support_claim_data:
-            return self._add_support(txo, txout, idx, tx_count)
+            return self._add_support(height, txo, txout, idx, tx_count, zero_delay_claims)
         return []
 
-    def _spend_support(self, txin):
+    def _remove_support(self, txin, zero_delay_claims):
         txin_num = self.db.transaction_num_mapping[txin.prev_hash]
-
+        supported_name = None
         if (txin_num, txin.prev_idx) in self.pending_support_txos:
             spent_support, support_amount = self.pending_support_txos.pop((txin_num, txin.prev_idx))
+            supported_name = self._get_pending_claim_name(spent_support)
             self.pending_supports[spent_support].remove((txin_num, txin.prev_idx))
         else:
             spent_support, support_amount = self.db.get_supported_claim_from_txo(txin_num, txin.prev_idx)
+            if spent_support:
+                supported_name = self._get_pending_claim_name(spent_support)
+
         if spent_support and support_amount is not None and spent_support not in self.pending_abandon:
-            # print(f"\tspent support for {spent_support.hex()} -{support_amount} ({txin_num}, {txin.prev_idx})")
+            controlling = self.db.get_controlling_claim(supported_name)
+            if controlling:
+                bid_queue = {
+                    claim_hash: self._get_pending_effective_amount(claim_hash)
+                    for claim_hash in self.db.get_claims_for_name(supported_name)
+                    if claim_hash not in self.pending_abandon
+                }
+                bid_queue[spent_support] -= support_amount
+                sorted_claims = sorted(
+                    list(bid_queue.keys()), key=lambda claim_hash: bid_queue[claim_hash], reverse=True
+                )
+                if controlling.claim_hash == spent_support and sorted_claims.index(controlling.claim_hash) > 0:
+                    print("takeover due to abandoned support")
+
+            # print(f"\tspent support for {spent_support.hex()} -{support_amount} ({txin_num}, {txin.prev_idx}) {supported_name}")
             if spent_support not in self.effective_amount_changes:
                 assert spent_support not in self.pending_claims
                 prev_effective_amount = self.db.get_effective_amount(spent_support)
@@ -527,7 +595,7 @@ class BlockProcessor:
             ).get_spend_support_txo_ops()
         return []
 
-    def _spend_claim(self, txin, spent_claims):
+    def _remove_claim(self, txin, spent_claims, zero_delay_claims):
         txin_num = self.db.transaction_num_mapping[txin.prev_hash]
         if (txin_num, txin.prev_idx) in self.pending_claims:
             spent = self.pending_claims[(txin_num, txin.prev_idx)]
@@ -540,7 +608,7 @@ class BlockProcessor:
             )
             if not spent_claim_hash_and_name:  # txo is not a claim
                 return []
-            prev_claim_hash, txi_len_encoded_name = spent_claim_hash_and_name
+            prev_claim_hash = spent_claim_hash_and_name.claim_hash
 
             prev_signing_hash = self.db.get_channel_for_claim(prev_claim_hash)
             prev_claims_in_channel_count = None
@@ -551,8 +619,14 @@ class BlockProcessor:
             prev_effective_amount = self.db.get_effective_amount(
                 prev_claim_hash
             )
-            claim_root_tx_num, claim_root_idx, prev_amount, name, tx_num, position = self.db.get_root_claim_txo_and_current_amount(prev_claim_hash)
-            activation_height = 0
+            k, v = self.db.get_root_claim_txo_and_current_amount(prev_claim_hash)
+            claim_root_tx_num = v.root_tx_num
+            claim_root_idx = v.root_position
+            prev_amount = v.amount
+            name = v.name
+            tx_num = k.tx_num
+            position = k.position
+            activation_height = v.activation
             height = bisect_right(self.db.tx_counts, tx_num)
             spent = StagedClaimtrieItem(
                 name, prev_claim_hash, prev_amount, prev_effective_amount,
@@ -564,23 +638,29 @@ class BlockProcessor:
         if spent.claim_hash not in self.effective_amount_changes:
             self.effective_amount_changes[spent.claim_hash].append(spent.effective_amount)
         self.effective_amount_changes[spent.claim_hash].append(-spent.amount)
+        if (name, spent.claim_hash) in zero_delay_claims:
+            zero_delay_claims.pop((name, spent.claim_hash))
         return spent.get_spend_claim_txo_ops()
 
-    def _spend_claim_or_support(self, txin, spent_claims):
-        spend_claim_ops = self._spend_claim(txin, spent_claims)
+    def _remove_claim_or_support(self, txin, spent_claims, zero_delay_claims):
+        spend_claim_ops = self._remove_claim(txin, spent_claims, zero_delay_claims)
         if spend_claim_ops:
             return spend_claim_ops
-        return self._spend_support(txin)
+        return self._remove_support(txin, zero_delay_claims)
 
-    def _abandon(self, spent_claims):
+    def _abandon(self, spent_claims) -> typing.Tuple[List['RevertableOp'], typing.Set[str]]:
         # Handle abandoned claims
         ops = []
 
+        controlling_claims = {}
+        need_takeover = set()
+
         for abandoned_claim_hash, (prev_tx_num, prev_idx, name) in spent_claims.items():
             # print(f"\tabandon lbry://{name}#{abandoned_claim_hash.hex()} {prev_tx_num} {prev_idx}")
 
             if (prev_tx_num, prev_idx) in self.pending_claims:
                 pending = self.pending_claims.pop((prev_tx_num, prev_idx))
+                self.staged_pending_abandoned[pending.claim_hash] = pending
                 claim_root_tx_num = pending.root_claim_tx_num
                 claim_root_idx = pending.root_claim_tx_position
                 prev_amount = pending.amount
@@ -588,9 +668,12 @@ class BlockProcessor:
                 prev_effective_amount = pending.effective_amount
                 prev_claims_in_channel_count = pending.claims_in_channel_count
             else:
-                claim_root_tx_num, claim_root_idx, prev_amount, _, _, _ = self.db.get_root_claim_txo_and_current_amount(
+                k, v = self.db.get_root_claim_txo_and_current_amount(
                     abandoned_claim_hash
                 )
+                claim_root_tx_num = v.root_tx_num
+                claim_root_idx = v.root_position
+                prev_amount = v.amount
                 prev_signing_hash = self.db.get_channel_for_claim(abandoned_claim_hash)
                 prev_claims_in_channel_count = None
                 if prev_signing_hash:
@@ -601,6 +684,13 @@ class BlockProcessor:
                     abandoned_claim_hash
                 )
 
+            if name not in controlling_claims:
+                controlling_claims[name] = self.db.get_controlling_claim(name)
+            controlling = controlling_claims[name]
+            if controlling and controlling.claim_hash == abandoned_claim_hash:
+                need_takeover.add(name)
+                # print("needs takeover")
+
             for (support_tx_num, support_tx_idx) in self.pending_supports[abandoned_claim_hash]:
                 _, support_amount = self.pending_support_txos.pop((support_tx_num, support_tx_idx))
                 ops.extend(
@@ -628,7 +718,7 @@ class BlockProcessor:
                 self.effective_amount_changes.pop(abandoned_claim_hash)
             self.pending_abandon.add(abandoned_claim_hash)
 
-            # print(f"\tabandoned lbry://{name}#{abandoned_claim_hash.hex()}")
+            # print(f"\tabandoned lbry://{name}#{abandoned_claim_hash.hex()}, {len(need_takeover)} names need takeovers")
             ops.extend(
                 StagedClaimtrieItem(
                     name, abandoned_claim_hash, prev_amount, prev_effective_amount,
@@ -636,20 +726,120 @@ class BlockProcessor:
                     claim_root_idx, prev_signing_hash, prev_claims_in_channel_count
                 ).get_abandon_ops(self.db.db)
             )
-        return ops
+        return ops, need_takeover
 
-    def _expire_claims(self, height: int):
+    def _expire_claims(self, height: int, zero_delay_claims):
         expired = self.db.get_expired_by_height(height)
         spent_claims = {}
         ops = []
+        names_needing_takeover = set()
         for expired_claim_hash, (tx_num, position, name, txi) in expired.items():
             if (tx_num, position) not in self.pending_claims:
-                ops.extend(self._spend_claim(txi, spent_claims))
+                ops.extend(self._remove_claim(txi, spent_claims, zero_delay_claims))
         if expired:
+            # do this to follow the same content claim removing pathway as if a claim (possible channel) was abandoned
+            abandon_ops, _names_needing_takeover = self._abandon(spent_claims)
+            if abandon_ops:
+                ops.extend(abandon_ops)
+                names_needing_takeover.update(_names_needing_takeover)
             ops.extend(self._abandon(spent_claims))
+        return ops, names_needing_takeover
+
+    def _get_pending_claim_amount(self, claim_hash: bytes) -> int:
+        if claim_hash in self.pending_claim_txos:
+            return self.pending_claims[self.pending_claim_txos[claim_hash]].amount
+        return self.db.get_claim_amount(claim_hash)
+
+    def _get_pending_claim_name(self, claim_hash: bytes) -> str:
+        assert claim_hash is not None
+        if claim_hash in self.pending_claims:
+            return self.pending_claims[claim_hash].name
+        claim = self.db.get_claim_from_txo(claim_hash)
+        return claim.name
+
+    def _get_pending_effective_amount(self, claim_hash: bytes) -> int:
+        claim_amount = self._get_pending_claim_amount(claim_hash) or 0
+        support_amount = self.db.get_support_amount(claim_hash) or 0
+        return claim_amount + support_amount + sum(
+            self.pending_support_txos[support_txnum, support_n][1]
+            for (support_txnum, support_n) in self.pending_supports.get(claim_hash, [])
+        )  # TODO: subtract pending spend supports
+
+    def _get_name_takeover_ops(self, height: int, name: str,
+                               activated_claims: typing.Set[bytes]) -> List['RevertableOp']:
+        controlling = self.db.get_controlling_claim(name)
+        if not controlling or controlling.claim_hash in self.pending_abandon:
+            # print("no controlling claim for ", name)
+            bid_queue = {
+                claim_hash: self._get_pending_effective_amount(claim_hash) for claim_hash in activated_claims
+            }
+            winning_claim = max(bid_queue, key=lambda k: bid_queue[k])
+            if winning_claim in self.pending_claim_txos:
+                s = self.pending_claims[self.pending_claim_txos[winning_claim]]
+            else:
+                s = self.db.make_staged_claim_item(winning_claim)
+            ops = []
+            if s.activation_height > height:
+                ops.extend(get_force_activate_ops(
+                    name, s.tx_num, s.position, s.claim_hash, s.root_claim_tx_num, s.root_claim_tx_position,
+                    s.amount, s.effective_amount, s.activation_height, height
+                ))
+            ops.extend(get_takeover_name_ops(name, winning_claim, height))
+            return ops
+        else:
+            # print(f"current controlling claim for {name}#{controlling.claim_hash.hex()}")
+            controlling_effective_amount = self._get_pending_effective_amount(controlling.claim_hash)
+            bid_queue = {
+                claim_hash: self._get_pending_effective_amount(claim_hash) for claim_hash in activated_claims
+            }
+            highest_newly_activated = max(bid_queue, key=lambda k: bid_queue[k])
+            if bid_queue[highest_newly_activated] > controlling_effective_amount:
+                # print(f"takeover controlling claim for {name}#{controlling.claim_hash.hex()}")
+                return get_takeover_name_ops(name, highest_newly_activated, height, controlling)
+            print(bid_queue[highest_newly_activated], controlling_effective_amount)
+            # print("no takeover")
+            return []
+
+    def _get_takeover_ops(self, height: int, zero_delay_claims) -> List['RevertableOp']:
+        ops = []
+        pending = defaultdict(set)
+
+        # get non delayed takeovers for new names
+        for (name, claim_hash) in zero_delay_claims:
+            if claim_hash not in self.pending_abandon:
+                pending[name].add(claim_hash)
+                # print("zero delay activate", name, claim_hash.hex())
+
+        # get takeovers from claims activated at this block
+        for activated in self.db.get_activated_claims_at_height(height):
+            if activated.claim_hash not in self.pending_abandon:
+                pending[activated.name].add(activated.claim_hash)
+                # print("delayed activate")
+
+        # get takeovers from supports for controlling claims being abandoned
+        for abandoned_claim_hash in self.pending_abandon:
+            if abandoned_claim_hash in self.staged_pending_abandoned:
+                abandoned = self.staged_pending_abandoned[abandoned_claim_hash]
+                controlling = self.db.get_controlling_claim(abandoned.name)
+                if controlling and controlling.claim_hash == abandoned_claim_hash and abandoned.name not in pending:
+                    pending[abandoned.name].update(self.db.get_claims_for_name(abandoned.name))
+            else:
+                k, v = self.db.get_root_claim_txo_and_current_amount(abandoned_claim_hash)
+                controlling_claim = self.db.get_controlling_claim(v.name)
+                if controlling_claim and abandoned_claim_hash == controlling_claim.claim_hash and v.name not in pending:
+                    pending[v.name].update(self.db.get_claims_for_name(v.name))
+                    # print("check abandoned winning")
+
+
+
+        # get takeovers from controlling claims being abandoned
+
+        for name, activated_claims in pending.items():
+            ops.extend(self._get_name_takeover_ops(height, name, activated_claims))
         return ops
 
     def advance_block(self, block):
+        # print("advance ", height)
         height = self.height + 1
         txs: List[Tuple[Tx, bytes]] = block.transactions
         block_hash = self.coin.header_hash(block.header)
@@ -672,7 +862,8 @@ class BlockProcessor:
         append_hashX_by_tx = hashXs_by_tx.append
         hashX_from_script = self.coin.hashX_from_script
 
-        # unchanged_effective_amounts = {k: sum(v) for k, v in self.effective_amount_changes.items()}
+        zero_delay_claims: typing.Dict[Tuple[str, bytes], Tuple[int, int]] = {}
+        abandoned_or_expired_controlling = set()
 
         for tx, tx_hash in txs:
             spent_claims = {}
@@ -690,7 +881,7 @@ class BlockProcessor:
                 undo_info_append(cache_value)
                 append_hashX(cache_value[:-12])
 
-                spend_claim_or_support_ops = self._spend_claim_or_support(txin, spent_claims)
+                spend_claim_or_support_ops = self._remove_claim_or_support(txin, spent_claims, zero_delay_claims)
                 if spend_claim_or_support_ops:
                     claimtrie_stash_extend(spend_claim_or_support_ops)
 
@@ -708,15 +899,16 @@ class BlockProcessor:
                 txo = Output(txout.value, script)
 
                 claim_or_support_ops = self._add_claim_or_support(
-                    height, tx_hash, tx_count, idx, txo, txout, script, spent_claims
+                    height, tx_hash, tx_count, idx, txo, txout, script, spent_claims, zero_delay_claims
                 )
                 if claim_or_support_ops:
                     claimtrie_stash_extend(claim_or_support_ops)
 
             # Handle abandoned claims
-            abandon_ops = self._abandon(spent_claims)
+            abandon_ops, abandoned_controlling_need_takeover = self._abandon(spent_claims)
             if abandon_ops:
                 claimtrie_stash_extend(abandon_ops)
+                abandoned_or_expired_controlling.update(abandoned_controlling_need_takeover)
 
             append_hashX_by_tx(hashXs)
             update_touched(hashXs)
@@ -725,11 +917,17 @@ class BlockProcessor:
             tx_count += 1
 
         # handle expired claims
-        expired_ops = self._expire_claims(height)
+        expired_ops, expired_need_takeover = self._expire_claims(height, zero_delay_claims)
         if expired_ops:
-            print(f"************\nexpire claims at block {height}\n************")
+            # print(f"************\nexpire claims at block {height}\n************")
+            abandoned_or_expired_controlling.update(expired_need_takeover)
             claimtrie_stash_extend(expired_ops)
 
+        # activate claims and process takeovers
+        takeover_ops = self._get_takeover_ops(height, zero_delay_claims)
+        if takeover_ops:
+            claimtrie_stash_extend(takeover_ops)
+
         # self.db.add_unflushed(hashXs_by_tx, self.tx_count)
         _unflushed = self.db.hist_unflushed
         _count = 0
@@ -789,7 +987,6 @@ class BlockProcessor:
         coin = self.coin
         for raw_block in raw_blocks:
             self.logger.info("backup block %i", self.height)
-            print("backup", self.height)
             # Check and update self.tip
             block = coin.block(raw_block, self.height)
             header_hash = coin.header_hash(block.header)
diff --git a/lbry/wallet/server/db/__init__.py b/lbry/wallet/server/db/__init__.py
index f41fb5b7a..52b9f4e33 100644
--- a/lbry/wallet/server/db/__init__.py
+++ b/lbry/wallet/server/db/__init__.py
@@ -15,6 +15,9 @@ class DB_PREFIXES(enum.Enum):
     claim_effective_amount_prefix = b'D'
     claim_expiration = b'O'
 
+    claim_takeover = b'P'
+    pending_activation = b'Q'
+
     undo_claimtrie = b'M'
 
     HISTORY_PREFIX = b'A'
diff --git a/lbry/wallet/server/db/claimtrie.py b/lbry/wallet/server/db/claimtrie.py
index 055e68912..9bc02a895 100644
--- a/lbry/wallet/server/db/claimtrie.py
+++ b/lbry/wallet/server/db/claimtrie.py
@@ -2,7 +2,7 @@ import typing
 from typing import Optional
 from lbry.wallet.server.db.revertable import RevertablePut, RevertableDelete, RevertableOp, delete_prefix
 from lbry.wallet.server.db import DB_PREFIXES
-from lbry.wallet.server.db.prefixes import Prefixes
+from lbry.wallet.server.db.prefixes import Prefixes, ClaimTakeoverValue
 
 nOriginalClaimExpirationTime = 262974
 nExtendedClaimExpirationTime = 2102400
@@ -13,6 +13,12 @@ nMaxTakeoverWorkaroundHeight = 658300   # targeting 30 Oct 2019
 nWitnessForkHeight = 680770             # targeting 11 Dec 2019
 nAllClaimsInMerkleForkHeight = 658310   # targeting 30 Oct 2019
 proportionalDelayFactor = 32
+maxTakeoverDelay = 4032
+
+
+def get_delay_for_name(blocks_of_continuous_ownership: int) -> int:
+    return min(blocks_of_continuous_ownership // proportionalDelayFactor, maxTakeoverDelay)
+
 
 def get_expiration_height(last_updated_height: int) -> int:
     if last_updated_height < nExtendedClaimExpirationForkHeight:
@@ -57,18 +63,21 @@ class StagedClaimtrieSupport(typing.NamedTuple):
 
 def get_update_effective_amount_ops(name: str, new_effective_amount: int, prev_effective_amount: int, tx_num: int,
                                     position: int, root_tx_num: int, root_position: int, claim_hash: bytes,
+                                    activation_height: int, prev_activation_height: int,
                                     signing_hash: Optional[bytes] = None,
                                     claims_in_channel_count: Optional[int] = None):
     assert root_position != root_tx_num, f"{tx_num} {position} {root_tx_num} {root_tx_num}"
     ops = [
         RevertableDelete(
             *Prefixes.claim_effective_amount.pack_item(
-                name, prev_effective_amount, tx_num, position, claim_hash, root_tx_num, root_position
+                name, prev_effective_amount, tx_num, position, claim_hash, root_tx_num, root_position,
+                prev_activation_height
             )
         ),
         RevertablePut(
             *Prefixes.claim_effective_amount.pack_item(
-                name, new_effective_amount, tx_num, position, claim_hash, root_tx_num, root_position
+                name, new_effective_amount, tx_num, position, claim_hash, root_tx_num, root_position,
+                activation_height
             )
         )
     ]
@@ -88,6 +97,89 @@ def get_update_effective_amount_ops(name: str, new_effective_amount: int, prev_e
     return ops
 
 
+def get_takeover_name_ops(name: str, claim_hash: bytes, takeover_height: int,
+                          previous_winning: Optional[ClaimTakeoverValue] = None):
+    if previous_winning:
+        # print(f"takeover previously owned {name} - {claim_hash.hex()} at {takeover_height}")
+        return [
+            RevertableDelete(
+                *Prefixes.claim_takeover.pack_item(
+                    name, previous_winning.claim_hash, previous_winning.height
+                )
+            ),
+            RevertablePut(
+                *Prefixes.claim_takeover.pack_item(
+                    name, claim_hash, takeover_height
+                )
+            )
+        ]
+    # print(f"takeover {name} - {claim_hash[::-1].hex()} at {takeover_height}")
+    return [
+        RevertablePut(
+            *Prefixes.claim_takeover.pack_item(
+                name, claim_hash, takeover_height
+            )
+        )
+    ]
+
+
+def get_force_activate_ops(name: str, tx_num: int, position: int, claim_hash: bytes, root_claim_tx_num: int,
+                           root_claim_tx_position: int, amount: int, effective_amount: int,
+                           prev_activation_height: int, new_activation_height: int):
+    return [
+        # delete previous
+        RevertableDelete(
+            *Prefixes.claim_effective_amount.pack_item(
+                name, effective_amount, tx_num, position, claim_hash,
+                root_claim_tx_num, root_claim_tx_position, prev_activation_height
+            )
+        ),
+        RevertableDelete(
+            *Prefixes.claim_to_txo.pack_item(
+                claim_hash, tx_num, position, root_claim_tx_num, root_claim_tx_position,
+                amount, prev_activation_height, name
+            )
+        ),
+        RevertableDelete(
+            *Prefixes.claim_short_id.pack_item(
+                name, claim_hash, root_claim_tx_num, root_claim_tx_position, tx_num,
+                position, prev_activation_height
+            )
+        ),
+        RevertableDelete(
+            *Prefixes.pending_activation.pack_item(
+                prev_activation_height, tx_num, position, claim_hash, name
+            )
+        ),
+
+        # insert new
+        RevertablePut(
+            *Prefixes.claim_effective_amount.pack_item(
+                name, effective_amount, tx_num, position, claim_hash,
+                root_claim_tx_num, root_claim_tx_position, new_activation_height
+            )
+        ),
+        RevertablePut(
+            *Prefixes.claim_to_txo.pack_item(
+                claim_hash, tx_num, position, root_claim_tx_num, root_claim_tx_position,
+                amount, new_activation_height, name
+            )
+        ),
+        RevertablePut(
+            *Prefixes.claim_short_id.pack_item(
+                name, claim_hash, root_claim_tx_num, root_claim_tx_position, tx_num,
+                position, new_activation_height
+            )
+        ),
+        RevertablePut(
+            *Prefixes.pending_activation.pack_item(
+                new_activation_height, tx_num, position, claim_hash, name
+            )
+        )
+
+    ]
+
+
 class StagedClaimtrieItem(typing.NamedTuple):
     name: str
     claim_hash: bytes
@@ -119,21 +211,21 @@ class StagedClaimtrieItem(typing.NamedTuple):
             op(
                 *Prefixes.claim_effective_amount.pack_item(
                     self.name, self.effective_amount, self.tx_num, self.position, self.claim_hash,
-                    self.root_claim_tx_num, self.root_claim_tx_position
+                    self.root_claim_tx_num, self.root_claim_tx_position, self.activation_height
                 )
             ),
             # claim tip by claim hash
             op(
                 *Prefixes.claim_to_txo.pack_item(
                     self.claim_hash, self.tx_num, self.position, self.root_claim_tx_num, self.root_claim_tx_position,
-                    self.amount, self.name
+                    self.amount, self.activation_height, self.name
                 )
             ),
             # short url resolution
             op(
                 *Prefixes.claim_short_id.pack_item(
                     self.name, self.claim_hash, self.root_claim_tx_num, self.root_claim_tx_position, self.tx_num,
-                    self.position
+                    self.position, self.activation_height
                 )
             ),
             # claim hash by txo
@@ -146,6 +238,12 @@ class StagedClaimtrieItem(typing.NamedTuple):
                     self.expiration_height, self.tx_num, self.position, self.claim_hash,
                     self.name
                 )
+            ),
+            # claim activation
+            op(
+                *Prefixes.pending_activation.pack_item(
+                    self.activation_height, self.tx_num, self.position, self.claim_hash, self.name
+                )
             )
         ]
         if self.signing_hash and self.claims_in_channel_count is not None:
@@ -187,4 +285,3 @@ class StagedClaimtrieItem(typing.NamedTuple):
         delete_supports_ops = delete_prefix(db, DB_PREFIXES.claim_to_support.value + self.claim_hash)
         invalidate_channel_ops = self.get_invalidate_channel_ops(db)
         return delete_short_id_ops + delete_claim_ops + delete_supports_ops + invalidate_channel_ops
-
diff --git a/lbry/wallet/server/db/prefixes.py b/lbry/wallet/server/db/prefixes.py
index c69d4f3ac..c34bbb0e5 100644
--- a/lbry/wallet/server/db/prefixes.py
+++ b/lbry/wallet/server/db/prefixes.py
@@ -46,6 +46,7 @@ class EffectiveAmountValue(typing.NamedTuple):
     claim_hash: bytes
     root_tx_num: int
     root_position: int
+    activation: int
 
 
 class ClaimToTXOKey(typing.NamedTuple):
@@ -58,6 +59,7 @@ class ClaimToTXOValue(typing.NamedTuple):
     root_tx_num: int
     root_position: int
     amount: int
+    activation: int
     name: str
 
 
@@ -81,6 +83,7 @@ class ClaimShortIDKey(typing.NamedTuple):
 class ClaimShortIDValue(typing.NamedTuple):
     tx_num: int
     position: int
+    activation: int
 
 
 class ClaimToChannelKey(typing.NamedTuple):
@@ -134,10 +137,30 @@ class ClaimExpirationValue(typing.NamedTuple):
     name: str
 
 
+class ClaimTakeoverKey(typing.NamedTuple):
+    name: str
+
+
+class ClaimTakeoverValue(typing.NamedTuple):
+    claim_hash: bytes
+    height: int
+
+
+class PendingActivationKey(typing.NamedTuple):
+    height: int
+    tx_num: int
+    position: int
+
+
+class PendingActivationValue(typing.NamedTuple):
+    claim_hash: bytes
+    name: str
+
+
 class EffectiveAmountPrefixRow(PrefixRow):
     prefix = DB_PREFIXES.claim_effective_amount_prefix.value
     key_struct = struct.Struct(b'>QLH')
-    value_struct = struct.Struct(b'>20sLH')
+    value_struct = struct.Struct(b'>20sLHL')
 
     @classmethod
     def pack_key(cls, name: str, effective_amount: int, tx_num: int, position: int):
@@ -160,20 +183,20 @@ class EffectiveAmountPrefixRow(PrefixRow):
         return EffectiveAmountValue(*super().unpack_value(data))
 
     @classmethod
-    def pack_value(cls, claim_hash: bytes, root_tx_num: int, root_position: int) -> bytes:
-        return super().pack_value(claim_hash, root_tx_num, root_position)
+    def pack_value(cls, claim_hash: bytes, root_tx_num: int, root_position: int, activation: int) -> bytes:
+        return super().pack_value(claim_hash, root_tx_num, root_position, activation)
 
     @classmethod
     def pack_item(cls, name: str, effective_amount: int, tx_num: int, position: int, claim_hash: bytes,
-                  root_tx_num: int, root_position: int):
+                  root_tx_num: int, root_position: int, activation: int):
         return cls.pack_key(name, effective_amount, tx_num, position), \
-               cls.pack_value(claim_hash, root_tx_num, root_position)
+               cls.pack_value(claim_hash, root_tx_num, root_position, activation)
 
 
 class ClaimToTXOPrefixRow(PrefixRow):
     prefix = DB_PREFIXES.claim_to_txo.value
     key_struct = struct.Struct(b'>20sLH')
-    value_struct = struct.Struct(b'>LHQ')
+    value_struct = struct.Struct(b'>LHQL')
 
     @classmethod
     def pack_key(cls, claim_hash: bytes, tx_num: int, position: int):
@@ -190,21 +213,21 @@ class ClaimToTXOPrefixRow(PrefixRow):
         )
 
     @classmethod
-    def unpack_value(cls, data: bytes) ->ClaimToTXOValue:
-        root_tx_num, root_position, amount = cls.value_struct.unpack(data[:14])
-        name_len = int.from_bytes(data[14:16], byteorder='big')
-        name = data[16:16 + name_len].decode()
-        return ClaimToTXOValue(root_tx_num, root_position, amount, name)
+    def unpack_value(cls, data: bytes) -> ClaimToTXOValue:
+        root_tx_num, root_position, amount, activation = cls.value_struct.unpack(data[:18])
+        name_len = int.from_bytes(data[18:20], byteorder='big')
+        name = data[20:20 + name_len].decode()
+        return ClaimToTXOValue(root_tx_num, root_position, amount, activation, name)
 
     @classmethod
-    def pack_value(cls, root_tx_num: int, root_position: int, amount: int, name: str) -> bytes:
-        return cls.value_struct.pack(root_tx_num, root_position, amount) + length_encoded_name(name)
+    def pack_value(cls, root_tx_num: int, root_position: int, amount: int, activation: int, name: str) -> bytes:
+        return cls.value_struct.pack(root_tx_num, root_position, amount, activation) + length_encoded_name(name)
 
     @classmethod
     def pack_item(cls, claim_hash: bytes, tx_num: int, position: int, root_tx_num: int, root_position: int,
-                  amount: int, name: str):
+                  amount: int, activation: int, name: str):
         return cls.pack_key(claim_hash, tx_num, position), \
-               cls.pack_value(root_tx_num, root_position, amount, name)
+               cls.pack_value(root_tx_num, root_position, amount, activation, name)
 
 
 class TXOToClaimPrefixRow(PrefixRow):
@@ -240,15 +263,15 @@ class TXOToClaimPrefixRow(PrefixRow):
 class ClaimShortIDPrefixRow(PrefixRow):
     prefix = DB_PREFIXES.claim_short_id_prefix.value
     key_struct = struct.Struct(b'>20sLH')
-    value_struct = struct.Struct(b'>LH')
+    value_struct = struct.Struct(b'>LHL')
 
     @classmethod
     def pack_key(cls, name: str, claim_hash: bytes, root_tx_num: int, root_position: int):
         return cls.prefix + length_encoded_name(name) + cls.key_struct.pack(claim_hash, root_tx_num, root_position)
 
     @classmethod
-    def pack_value(cls, tx_num: int, position: int):
-        return super().pack_value(tx_num, position)
+    def pack_value(cls, tx_num: int, position: int, activation: int):
+        return super().pack_value(tx_num, position, activation)
 
     @classmethod
     def unpack_key(cls, key: bytes) -> ClaimShortIDKey:
@@ -263,9 +286,9 @@ class ClaimShortIDPrefixRow(PrefixRow):
 
     @classmethod
     def pack_item(cls, name: str, claim_hash: bytes, root_tx_num: int, root_position: int,
-                  tx_num: int, position: int):
+                  tx_num: int, position: int, activation: int):
         return cls.pack_key(name, claim_hash, root_tx_num, root_position), \
-               cls.pack_value(tx_num, position)
+               cls.pack_value(tx_num, position, activation)
 
 
 class ClaimToChannelPrefixRow(PrefixRow):
@@ -418,6 +441,63 @@ class ClaimExpirationPrefixRow(PrefixRow):
         return cls.unpack_key(key), cls.unpack_value(value)
 
 
+class ClaimTakeoverPrefixRow(PrefixRow):
+    prefix = DB_PREFIXES.claim_takeover.value
+    value_struct = struct.Struct(b'>20sL')
+
+    @classmethod
+    def pack_key(cls, name: str):
+        return cls.prefix + length_encoded_name(name)
+
+    @classmethod
+    def pack_value(cls, claim_hash: bytes, takeover_height: int):
+        return super().pack_value(claim_hash, takeover_height)
+
+    @classmethod
+    def unpack_key(cls, key: bytes) -> ClaimTakeoverKey:
+        assert key[:1] == cls.prefix
+        name_len = int.from_bytes(key[1:3], byteorder='big')
+        name = key[3:3 + name_len].decode()
+        return ClaimTakeoverKey(name)
+
+    @classmethod
+    def unpack_value(cls, data: bytes) -> ClaimTakeoverValue:
+        return ClaimTakeoverValue(*super().unpack_value(data))
+
+    @classmethod
+    def pack_item(cls, name: str, claim_hash: bytes, takeover_height: int):
+        return cls.pack_key(name), cls.pack_value(claim_hash, takeover_height)
+
+
+class PendingClaimActivationPrefixRow(PrefixRow):
+    prefix = DB_PREFIXES.pending_activation.value
+    key_struct = struct.Struct(b'>LLH')
+
+    @classmethod
+    def pack_key(cls, height: int, tx_num: int, position: int):
+        return super().pack_key(height, tx_num, position)
+
+    @classmethod
+    def unpack_key(cls, key: bytes) -> PendingActivationKey:
+        return PendingActivationKey(*super().unpack_key(key))
+
+    @classmethod
+    def pack_value(cls, claim_hash: bytes, name: str) -> bytes:
+        return claim_hash + length_encoded_name(name)
+
+    @classmethod
+    def unpack_value(cls, data: bytes) -> PendingActivationValue:
+        claim_hash = data[:20]
+        name_len = int.from_bytes(data[20:22], byteorder='big')
+        name = data[22:22 + name_len].decode()
+        return PendingActivationValue(claim_hash, name)
+
+    @classmethod
+    def pack_item(cls, height: int, tx_num: int, position: int, claim_hash: bytes, name: str):
+        return cls.pack_key(height, tx_num, position), \
+               cls.pack_value(claim_hash, name)
+
+
 class Prefixes:
     claim_to_support = ClaimToSupportPrefixRow
     support_to_claim = SupportToClaimPrefixRow
@@ -432,4 +512,7 @@ class Prefixes:
     claim_effective_amount = EffectiveAmountPrefixRow
     claim_expiration = ClaimExpirationPrefixRow
 
+    claim_takeover = ClaimTakeoverPrefixRow
+    pending_activation = PendingClaimActivationPrefixRow
+
     # undo_claimtrie = b'M'
diff --git a/lbry/wallet/server/leveldb.py b/lbry/wallet/server/leveldb.py
index 533f7a780..e081000a3 100644
--- a/lbry/wallet/server/leveldb.py
+++ b/lbry/wallet/server/leveldb.py
@@ -16,6 +16,8 @@ import time
 import typing
 import struct
 import attr
+import zlib
+import base64
 from typing import Optional, Iterable
 from functools import partial
 from asyncio import sleep
@@ -34,9 +36,10 @@ from lbry.wallet.server.util import formatted_time, pack_be_uint16, unpack_be_ui
 from lbry.wallet.server.storage import db_class
 from lbry.wallet.server.db.revertable import RevertablePut, RevertableDelete, RevertableOp, delete_prefix
 from lbry.wallet.server.db import DB_PREFIXES
-from lbry.wallet.server.db.prefixes import Prefixes
+from lbry.wallet.server.db.prefixes import Prefixes, PendingActivationValue, ClaimTakeoverValue, ClaimToTXOValue
 from lbry.wallet.server.db.claimtrie import StagedClaimtrieItem, get_update_effective_amount_ops, length_encoded_name
-from lbry.wallet.server.db.claimtrie import get_expiration_height
+from lbry.wallet.server.db.claimtrie import get_expiration_height, get_delay_for_name
+
 from lbry.wallet.server.db.elasticsearch import SearchIndex
 
 
@@ -79,7 +82,7 @@ class FlushData:
     adds = attr.ib()
     deletes = attr.ib()
     tip = attr.ib()
-    undo_claimtrie = attr.ib()
+    undo = attr.ib()
 
 
 class ResolveResult(typing.NamedTuple):
@@ -89,6 +92,7 @@ class ResolveResult(typing.NamedTuple):
     position: int
     tx_hash: bytes
     height: int
+    amount: int
     short_url: str
     is_controlling: bool
     canonical_url: str
@@ -97,12 +101,14 @@ class ResolveResult(typing.NamedTuple):
     expiration_height: int
     effective_amount: int
     support_amount: int
-    last_take_over_height: Optional[int]
+    last_takeover_height: Optional[int]
     claims_in_channel: Optional[int]
     channel_hash: Optional[bytes]
     reposted_claim_hash: Optional[bytes]
 
 
+OptionalResolveResultOrError = Optional[typing.Union[ResolveResult, LookupError, ValueError]]
+
 DB_STATE_STRUCT = struct.Struct(b'>32sLL32sHLBBlll')
 DB_STATE_STRUCT_SIZE = 92
 
@@ -183,12 +189,10 @@ class LevelDB:
         self.search_index = SearchIndex(self.env.es_index_prefix, self.env.database_query_timeout)
 
     def claim_hash_and_name_from_txo(self, tx_num: int, tx_idx: int):
-        claim_hash_and_name = self.db.get(
-            DB_PREFIXES.txo_to_claim.value + TXO_STRUCT_pack(tx_num, tx_idx)
-        )
+        claim_hash_and_name = self.db.get(Prefixes.txo_to_claim.pack_key(tx_num, tx_idx))
         if not claim_hash_and_name:
             return
-        return claim_hash_and_name[:CLAIM_HASH_LEN], claim_hash_and_name[CLAIM_HASH_LEN:]
+        return Prefixes.txo_to_claim.unpack_value(claim_hash_and_name)
 
     def get_supported_claim_from_txo(self, tx_num: int, position: int) -> typing.Tuple[Optional[bytes], Optional[int]]:
         key = Prefixes.support_to_claim.pack_key(tx_num, position)
@@ -213,20 +217,22 @@ class LevelDB:
             unpacked_k = Prefixes.claim_to_support.unpack_key(k)
             unpacked_v = Prefixes.claim_to_support.unpack_value(v)
             supports.append((unpacked_k.tx_num, unpacked_k.position, unpacked_v.amount))
-
         return supports
 
     def _prepare_resolve_result(self, tx_num: int, position: int, claim_hash: bytes, name: str, root_tx_num: int,
-                                root_position: int) -> ResolveResult:
+                                root_position: int, activation_height: int) -> ResolveResult:
+        controlling_claim = self.get_controlling_claim(name)
+
         tx_hash = self.total_transactions[tx_num]
         height = bisect_right(self.tx_counts, tx_num)
         created_height = bisect_right(self.tx_counts, root_tx_num)
-        last_take_over_height = 0
-        activation_height = created_height
+        last_take_over_height = controlling_claim.height
 
         expiration_height = get_expiration_height(height)
         support_amount = self.get_support_amount(claim_hash)
-        effective_amount = self.get_effective_amount(claim_hash)
+        claim_amount = self.get_claim_txo_amount(claim_hash, tx_num, position)
+
+        effective_amount = support_amount + claim_amount
         channel_hash = self.get_channel_for_claim(claim_hash)
 
         claims_in_channel = None
@@ -235,27 +241,35 @@ class LevelDB:
         if channel_hash:
             channel_vals = self.get_root_claim_txo_and_current_amount(channel_hash)
             if channel_vals:
-                _, _, _, channel_name, _, _ = channel_vals
+                channel_name = channel_vals[1].name
                 claims_in_channel = self.get_claims_in_channel_count(channel_hash)
                 canonical_url = f'{channel_name}#{channel_hash.hex()}/{name}#{claim_hash.hex()}'
         return ResolveResult(
-            name, claim_hash, tx_num, position, tx_hash, height, short_url=short_url,
-            is_controlling=False, canonical_url=canonical_url, last_take_over_height=last_take_over_height,
-            claims_in_channel=claims_in_channel, creation_height=created_height, activation_height=activation_height,
+            name, claim_hash, tx_num, position, tx_hash, height, claim_amount, short_url=short_url,
+            is_controlling=controlling_claim.claim_hash == claim_hash, canonical_url=canonical_url,
+            last_takeover_height=last_take_over_height, claims_in_channel=claims_in_channel,
+            creation_height=created_height, activation_height=activation_height,
             expiration_height=expiration_height, effective_amount=effective_amount, support_amount=support_amount,
             channel_hash=channel_hash, reposted_claim_hash=None
         )
 
     def _resolve(self, normalized_name: str, claim_id: Optional[str] = None,
-                 amount_order: int = 1) -> Optional[ResolveResult]:
+                 amount_order: Optional[int] = None) -> Optional[ResolveResult]:
         """
         :param normalized_name: name
         :param claim_id: partial or complete claim id
         :param amount_order: '$<value>' suffix to a url, defaults to 1 (winning) if no claim id modifier is provided
         """
+        if not amount_order and not claim_id:
+            # winning resolution
+            controlling = self.get_controlling_claim(normalized_name)
+            if not controlling:
+                return
+            return self._fs_get_claim_by_hash(controlling.claim_hash)
 
         encoded_name = length_encoded_name(normalized_name)
         amount_order = max(int(amount_order or 1), 1)
+
         if claim_id:
             # resolve by partial/complete claim id
             short_claim_hash = bytes.fromhex(claim_id)
@@ -263,19 +277,22 @@ class LevelDB:
             for k, v in self.db.iterator(prefix=prefix):
                 key = Prefixes.claim_short_id.unpack_key(k)
                 claim_txo = Prefixes.claim_short_id.unpack_value(v)
-                return self._prepare_resolve_result(claim_txo.tx_num, claim_txo.position, key.claim_hash, key.name,
-                                                    key.root_tx_num, key.root_position)
+                return self._prepare_resolve_result(
+                    claim_txo.tx_num, claim_txo.position, key.claim_hash, key.name, key.root_tx_num,
+                    key.root_position, claim_txo.activation
+                )
             return
 
         # resolve by amount ordering, 1 indexed
-        for idx, (k, v) in enumerate(self.db.iterator(prefix=DB_PREFIXES.claim_effective_amount_prefix.value + encoded_name)):
+        for idx, (k, v) in enumerate(self.db.iterator(
+                prefix=DB_PREFIXES.claim_effective_amount_prefix.value + encoded_name)):
             if amount_order > idx + 1:
                 continue
             key = Prefixes.claim_effective_amount.unpack_key(k)
             claim_val = Prefixes.claim_effective_amount.unpack_value(v)
             return self._prepare_resolve_result(
                 key.tx_num, key.position, claim_val.claim_hash, key.name, claim_val.root_tx_num,
-                claim_val.root_position
+                claim_val.root_position, claim_val.activation
             )
         return
 
@@ -293,7 +310,7 @@ class LevelDB:
             return
         return list(sorted(candidates, key=lambda item: item[1]))[0]
 
-    def _fs_resolve(self, url):
+    def _fs_resolve(self, url) -> typing.Tuple[OptionalResolveResultOrError, OptionalResolveResultOrError]:
         try:
             parsed = URL.parse(url)
         except ValueError as e:
@@ -326,7 +343,7 @@ class LevelDB:
 
         return resolved_stream, resolved_channel
 
-    async def fs_resolve(self, url):
+    async def fs_resolve(self, url) -> typing.Tuple[OptionalResolveResultOrError, OptionalResolveResultOrError]:
          return await asyncio.get_event_loop().run_in_executor(self.executor, self._fs_resolve, url)
 
     def _fs_get_claim_by_hash(self, claim_hash):
@@ -335,7 +352,7 @@ class LevelDB:
             unpacked_v = Prefixes.claim_to_txo.unpack_value(v)
             return self._prepare_resolve_result(
                 unpacked_k.tx_num, unpacked_k.position, unpacked_k.claim_hash, unpacked_v.name,
-                unpacked_v.root_tx_num, unpacked_v.root_position
+                unpacked_v.root_tx_num, unpacked_v.root_position, unpacked_v.activation
             )
 
     async def fs_getclaimbyid(self, claim_id):
@@ -352,17 +369,21 @@ class LevelDB:
         for k, v in self.db.iterator(prefix=DB_PREFIXES.claim_to_txo.value + claim_hash):
             unpacked_k = Prefixes.claim_to_txo.unpack_key(k)
             unpacked_v = Prefixes.claim_to_txo.unpack_value(v)
-            return unpacked_v.root_tx_num, unpacked_v.root_position, unpacked_v.amount, unpacked_v.name,\
-                   unpacked_k.tx_num, unpacked_k.position
+            return unpacked_k, unpacked_v
 
-    def make_staged_claim_item(self, claim_hash: bytes) -> StagedClaimtrieItem:
-        root_tx_num, root_idx, value, name, tx_num, idx = self.db.get_root_claim_txo_and_current_amount(
-            claim_hash
-        )
+    def make_staged_claim_item(self, claim_hash: bytes) -> Optional[StagedClaimtrieItem]:
+        claim_info = self.get_root_claim_txo_and_current_amount(claim_hash)
+        k, v = claim_info
+        root_tx_num = v.root_tx_num
+        root_idx = v.root_position
+        value = v.amount
+        name = v.name
+        tx_num = k.tx_num
+        idx = k.position
         height = bisect_right(self.tx_counts, tx_num)
-        effective_amount = self.db.get_support_amount(claim_hash) + value
+        effective_amount = self.get_support_amount(claim_hash) + value
         signing_hash = self.get_channel_for_claim(claim_hash)
-        activation_height = 0
+        activation_height = v.activation
         if signing_hash:
             count = self.get_claims_in_channel_count(signing_hash)
         else:
@@ -372,17 +393,36 @@ class LevelDB:
             root_tx_num, root_idx, signing_hash, count
         )
 
-    def get_effective_amount(self, claim_hash):
+    def get_claim_txo_amount(self, claim_hash: bytes, tx_num: int, position: int) -> Optional[int]:
+        v = self.db.get(Prefixes.claim_to_txo.pack_key(claim_hash, tx_num, position))
+        if v:
+            return Prefixes.claim_to_txo.unpack_value(v).amount
+
+    def get_claim_from_txo(self, claim_hash: bytes) -> Optional[ClaimToTXOValue]:
+        assert claim_hash
         for v in self.db.iterator(prefix=DB_PREFIXES.claim_to_txo.value + claim_hash, include_key=False):
-            return Prefixes.claim_to_txo.unpack_value(v).amount + self.get_support_amount(claim_hash)
-        fnord
-        return None
+            return Prefixes.claim_to_txo.unpack_value(v)
+
+    def get_claim_amount(self, claim_hash: bytes) -> Optional[int]:
+        claim = self.get_claim_from_txo(claim_hash)
+        if claim:
+            return claim.amount
+
+    def get_effective_amount(self, claim_hash: bytes):
+        return (self.get_claim_amount(claim_hash) or 0) + self.get_support_amount(claim_hash)
 
     def get_update_effective_amount_ops(self, claim_hash: bytes, effective_amount: int):
         claim_info = self.get_root_claim_txo_and_current_amount(claim_hash)
         if not claim_info:
             return []
-        root_tx_num, root_position, amount, name, tx_num, position = claim_info
+
+        root_tx_num = claim_info[1].root_tx_num
+        root_position = claim_info[1].root_position
+        amount = claim_info[1].amount
+        name = claim_info[1].name
+        tx_num = claim_info[0].tx_num
+        position = claim_info[0].position
+        activation = claim_info[1].activation
         signing_hash = self.get_channel_for_claim(claim_hash)
         claims_in_channel_count = None
         if signing_hash:
@@ -390,7 +430,8 @@ class LevelDB:
         prev_effective_amount = self.get_effective_amount(claim_hash)
         return get_update_effective_amount_ops(
             name, effective_amount, prev_effective_amount, tx_num, position,
-            root_tx_num, root_position, claim_hash, signing_hash, claims_in_channel_count
+            root_tx_num, root_position, claim_hash, activation, activation, signing_hash,
+            claims_in_channel_count
         )
 
     def get_claims_in_channel_count(self, channel_hash) -> int:
@@ -415,6 +456,35 @@ class LevelDB:
             )
         return expired
 
+    def get_controlling_claim(self, name: str) -> Optional[ClaimTakeoverValue]:
+        controlling = self.db.get(Prefixes.claim_takeover.pack_key(name))
+        if not controlling:
+            return
+        return Prefixes.claim_takeover.unpack_value(controlling)
+
+    def get_claims_for_name(self, name: str):
+        claim_hashes = set()
+        for k in self.db.iterator(prefix=Prefixes.claim_short_id.prefix + length_encoded_name(name),
+                                  include_value=False):
+            claim_hashes.add(Prefixes.claim_short_id.unpack_key(k).claim_hash)
+        return claim_hashes
+
+    def get_activated_claims_at_height(self, height: int) -> typing.Set[PendingActivationValue]:
+        claims = set()
+        prefix = Prefixes.pending_activation.prefix + height.to_bytes(4, byteorder='big')
+        for _v in self.db.iterator(prefix=prefix, include_key=False):
+            v = Prefixes.pending_activation.unpack_value(_v)
+            claims.add(v)
+        return claims
+
+    def get_activation_delay(self, claim_hash: bytes, name: str) -> int:
+        controlling = self.get_controlling_claim(name)
+        if not controlling:
+            return 0
+        if claim_hash == controlling.claim_hash:
+            return 0
+        return get_delay_for_name(self.db_height - controlling.height)
+
     async def _read_tx_counts(self):
         if self.tx_counts is not None:
             return
@@ -685,9 +755,9 @@ class LevelDB:
                     batch_delete(staged_change.key)
             flush_data.claimtrie_stash.clear()
 
-            for undo_claims, height in flush_data.undo_claimtrie:
-                batch_put(DB_PREFIXES.undo_claimtrie.value + util.pack_be_uint64(height), undo_claims)
-            flush_data.undo_claimtrie.clear()
+            for undo_ops, height in flush_data.undo:
+                batch_put(DB_PREFIXES.undo_claimtrie.value + util.pack_be_uint64(height), undo_ops)
+            flush_data.undo.clear()
 
             self.fs_height = flush_data.height
             self.fs_tx_count = flush_data.tx_count
@@ -788,11 +858,10 @@ class LevelDB:
 
             claim_reorg_height = self.fs_height
             # print("flush undos", flush_data.undo_claimtrie)
-            for (ops, height) in reversed(flush_data.undo_claimtrie):
-                claimtrie_ops = RevertableOp.unpack_stack(ops)
-                print("%i undo ops for %i" % (len(claimtrie_ops), height))
-                for op in reversed(claimtrie_ops):
-                    print("REWIND", op)
+            for (packed_ops, height) in reversed(flush_data.undo):
+                undo_ops = RevertableOp.unpack_stack(packed_ops)
+                for op in reversed(undo_ops):
+                    # print("REWIND", op)
                     if op.is_put:
                         batch_put(op.key, op.value)
                     else:
@@ -800,7 +869,7 @@ class LevelDB:
                 batch_delete(DB_PREFIXES.undo_claimtrie.value + util.pack_be_uint64(claim_reorg_height))
                 claim_reorg_height -= 1
 
-            flush_data.undo_claimtrie.clear()
+            flush_data.undo.clear()
             flush_data.claimtrie_stash.clear()
 
             while self.fs_height > flush_data.height:
@@ -828,9 +897,9 @@ class LevelDB:
                     batch_put(key, value)
 
             # New undo information
-            for undo_info, height in flush_data.undo_infos:
+            for undo_info, height in flush_data.undo:
                 batch.put(self.undo_key(height), b''.join(undo_info))
-            flush_data.undo_infos.clear()
+            flush_data.undo.clear()
 
             # Spends
             for key in sorted(flush_data.deletes):
@@ -1023,9 +1092,9 @@ class LevelDB:
         """Returns a height from which we should store undo info."""
         return max_height - self.env.reorg_limit + 1
 
-    def undo_key(self, height):
+    def undo_key(self, height: int) -> bytes:
         """DB key for undo information at the given height."""
-        return UNDO_PREFIX + pack('>I', height)
+        return DB_PREFIXES.UNDO_PREFIX.value + pack('>I', height)
 
     def read_undo_info(self, height):
         """Read undo information from a file for the current height."""