diff --git a/nucypher/blockchain/eth/actors.py b/nucypher/blockchain/eth/actors.py
index 052084eb3..9405e1d07 100644
--- a/nucypher/blockchain/eth/actors.py
+++ b/nucypher/blockchain/eth/actors.py
@@ -350,10 +350,10 @@ class Miner(NucypherTokenActor):
         return policy_reward_txhash
 
     @only_me
-    def collect_staking_reward(self) -> str:
+    def collect_staking_reward(self, collector_address: str) -> str:
         """Withdraw tokens rewarded for staking."""
 
-        collection_txhash = self.miner_agent.collect_staking_reward(collector_address=self.checksum_public_address)
+        collection_txhash = self.miner_agent.collect_staking_reward(collector_address=collector_address)
         self._transaction_cache.append((datetime.utcnow(), collection_txhash))
 
         return collection_txhash
diff --git a/nucypher/blockchain/eth/agents.py b/nucypher/blockchain/eth/agents.py
index dbdc72d64..c592c0bab 100644
--- a/nucypher/blockchain/eth/agents.py
+++ b/nucypher/blockchain/eth/agents.py
@@ -25,10 +25,10 @@ class EthereumContractAgent(ABC):
     class ContractNotDeployed(Exception):
         pass
 
-    def __new__(cls, *args, **kwargs) -> 'EthereumContractAgent':
-        if cls.__instance is NO_CONTRACT_AVAILABLE:
-            cls.__instance = super(EthereumContractAgent, cls).__new__(cls)
-        return cls.__instance
+    # def __new__(cls, *args, **kwargs) -> 'EthereumContractAgent': TODO: remove?
+    #     if cls.__instance is NO_CONTRACT_AVAILABLE:
+    #         cls.__instance = super(EthereumContractAgent, cls).__new__(cls)
+    #     return cls.__instance
 
     def __init__(self,
                  blockchain: Blockchain = None,
@@ -290,7 +290,7 @@ class PolicyAgent(EthereumContractAgent):
 
     def revoke_policy(self, policy_id: bytes, author_address) -> str:
         """Revoke by arrangement ID; Only the policy's author_address can revoke the policy."""
-        txhash = self.contract.functions.revokePolicy(policy_id).transact({'from': author_address.address})
+        txhash = self.contract.functions.revokePolicy(policy_id).transact({'from': author_address})
         self.blockchain.wait_for_receipt(txhash)
         return txhash
 
@@ -301,13 +301,13 @@ class PolicyAgent(EthereumContractAgent):
         return policy_reward_txhash
 
     def fetch_policy_arrangements(self, policy_id):
-        records = self.contract.functions.getArrangementsLength(policy_id).call()
-        for records in range(records):
-            arrangement = self.contract.functions.getArrangementInfo(policy_id, 0).call()[records]
+        record_count = self.contract.functions.getArrangementsLength(policy_id).call()
+        for index in range(record_count):
+            arrangement = self.contract.functions.getArrangementInfo(policy_id, index).call()
             yield arrangement
 
-    def revoke_arrangement(self, policy_id: str, node_address: str):
-        txhash = self.contract.functions.revokeArrangement(policy_id, node_address)
+    def revoke_arrangement(self, policy_id: str, node_address: str, author_address: str):
+        txhash = self.contract.functions.revokeArrangement(policy_id, node_address).transact({'from': author_address})
         self.blockchain.wait_for_receipt(txhash)
         return txhash
 
diff --git a/nucypher/blockchain/eth/deployers.py b/nucypher/blockchain/eth/deployers.py
index ab33908bc..80c8d4015 100644
--- a/nucypher/blockchain/eth/deployers.py
+++ b/nucypher/blockchain/eth/deployers.py
@@ -1,4 +1,5 @@
 from constant_sorrow.constants import CONTRACT_NOT_DEPLOYED, NO_DEPLOYER_CONFIGURED
+from eth_utils import is_checksum_address
 from typing import Tuple, Dict
 
 from nucypher.blockchain.eth import constants
diff --git a/tests/blockchain/eth/interfaces/test_chains.py b/tests/blockchain/eth/interfaces/test_chains.py
index 82a198d19..3081f8593 100644
--- a/tests/blockchain/eth/interfaces/test_chains.py
+++ b/tests/blockchain/eth/interfaces/test_chains.py
@@ -1,6 +1,3 @@
-from nucypher.blockchain.eth.deployers import NucypherTokenDeployer
-
-
 def test_testerchain_creation(testerchain):
     # Ensure we are testing on the correct network...
     assert 'tester' in testerchain.interface.provider_uri
@@ -9,9 +6,3 @@ def test_testerchain_creation(testerchain):
     assert testerchain.interface.w3.eth.blockNumber >= 0
 
 
-def test_nucypher_contract_compiled(testerchain):
-    # Ensure that solidity smart contacts are available, post-compile.
-    origin, *everybody_else = testerchain.interface.w3.eth.accounts
-
-    token_contract_identifier = NucypherTokenDeployer(blockchain=testerchain, deployer_address=origin)._contract_name
-    assert token_contract_identifier in testerchain.interface._BlockchainInterface__raw_contract_cache