diff --git a/casper4/simple_casper_tester.py b/casper4/simple_casper_tester.py
index 22655db..1a725c9 100644
--- a/casper4/simple_casper_tester.py
+++ b/casper4/simple_casper_tester.py
@@ -55,26 +55,31 @@ def mk_status_flicker(epoch, login, key):
 
 # Begin the test
 
+print("Starting tests")
 # Initialize the first epoch
 s.state.block_number = EPOCH_LENGTH
 casper.initialize_epoch(1)
 assert casper.get_nextValidatorIndex() == 1
 start = s.snapshot()
+print("Epoch initialized")
 # Send a prepare message
 casper.prepare(0, mk_prepare(1, '\x35' * 32, '\x00' * 32, 0, '\x00' * 32, t.k0))
 epoch_1_anchash = utils.sha3(b'\x35' * 32 + b'\x00' * 32)
 assert casper.get_consensus_messages__hash_justified(1, b'\x35' * 32)
 assert casper.get_consensus_messages__ancestry_hash_justified(1, epoch_1_anchash)
+print("Prepare message processed")
 # Send a commit message
 casper.commit(0, mk_commit(1, '\x35' * 32, t.k0))
 # Check that we committed
 assert casper.get_consensus_messages__committed(1)
+print("Commit message processed")
 # Initialize the second epoch 
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(2)
 # Check that the dynasty increased as expected
 assert casper.get_dynasty() == 1
 assert casper.get_total_deposits(1) == casper.get_total_deposits(0) > 0
+print("Second epoch initialized, dynasty increased as expected")
 # Send a prepare message
 casper.prepare(0, mk_prepare(2, '\x45' * 32, epoch_1_anchash, 1, epoch_1_anchash, t.k0))
 # Send a commit message
@@ -87,17 +92,20 @@ assert casper.get_consensus_messages__committed(2)
 # Initialize the third epoch
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(3)
+print("Second epoch prepared and committed, third epoch initialized")
 # Test the NO_DBL_PREPARE slashing condition
 p1 = mk_prepare(3, '\x56' * 32, epoch_2_anchash, 2, epoch_2_anchash, t.k0)
 p2 = mk_prepare(3, '\x57' * 32, epoch_2_anchash, 2, epoch_2_anchash, t.k0)
 snapshot = s.snapshot()
 casper.double_prepare_slash(0, p1, p2)
 s.revert(snapshot)
+print("NO_DBL_PREPARE slashing condition works")
 # Test the PREPARE_COMMIT_CONSISTENCY slashing condition
 p3 = mk_prepare(3, '\x58' * 32, epoch_2_anchash, 0, b'\x00' * 32, t.k0)
 snapshot = s.snapshot()
 casper.prepare_commit_inconsistency_slash(0, p3, epoch_2_commit)
 s.revert(snapshot)
+print("PREPARE_COMMIT_CONSISTENCY slashing condition works")
 # Finish the third epoch
 casper.prepare(0, p1)
 casper.commit(0, mk_commit(3, '\x56' * 32, t.k0))
@@ -114,6 +122,7 @@ p4 = mk_prepare(4, '\x78' * 32, '\x12' * 32, 3, '\x24' * 32, t.k0)
 # Initialize the fifth epoch
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(5)
+print("Epochs up to 5 initialized")
 # Dynasty not incremented because no commits were made
 assert casper.get_dynasty() == 3
 epoch_5_anchash = utils.sha3(b'\x78' * 32 + epoch_4_anchash)
@@ -122,8 +131,10 @@ casper.prepare(0, p5)
 # Test the COMMIT_REQ slashing condition
 kommit = mk_commit(5, b'\x80' * 32, t.k0)
 s.state.block_number += EPOCH_LENGTH * 30
+print("Speeding up time to test remaining two slashing conditions")
 for i in range(6, 36):
     casper.initialize_epoch(i)
+print("Epochs up to 36 initialized")
 snapshot = s.snapshot()
 casper.commit_non_justification_slash(0, kommit)
 s.revert(snapshot)
@@ -133,6 +144,7 @@ try:
 except:
     success = False
 assert not success
+print("COMMIT_REQ slashing condition works")
 # Test the PREPARE_REQ slashing condition
 casper.derive_ancestry(epoch_3_anchash, epoch_2_anchash, epoch_1_anchash)
 snapshot = s.snapshot()
@@ -144,31 +156,40 @@ try:
 except:
     success = False
 assert not success
+print("PREPARE_REQ slashing condition works")
 
+print("Restarting the chain for test 2")
 # Restart the chain
 s.revert(start)
 assert casper.get_dynasty() == 0
 assert casper.get_current_epoch() == 1
 assert casper.get_consensus_messages__ancestry_hash_justified(0, b'\x00' * 32)
+print("Epoch 1 initialized")
 for k in (t.k1, t.k2, t.k3, t.k4, t.k5, t.k6):
     casper.deposit(utils.privtoaddr(k), utils.privtoaddr(k), value=3 * 10**15)
+print("Processed 6 deposits")
 casper.prepare(0, mk_prepare(1, b'\x10' * 32, b'\x00' * 32, 0, b'\x00' * 32, t.k0))
 casper.commit(0, mk_commit(1, b'\x10' * 32, t.k0))
 epoch_1_anchash = utils.sha3(b'\x10' * 32 + b'\x00' * 32)
 assert casper.get_consensus_messages__committed(1)
+print("Prepared and committed")
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(2)
+print("Epoch 2 initialized")
 assert casper.get_dynasty() == 1
 casper.prepare(0, mk_prepare(2, b'\x20' * 32, epoch_1_anchash, 1, epoch_1_anchash, t.k0))
 casper.commit(0, mk_commit(2, b'\x20' * 32, t.k0))
 epoch_2_anchash = utils.sha3(b'\x20' * 32 + epoch_1_anchash)
 assert casper.get_consensus_messages__committed(2)
+print("Confirmed that one key is still sufficient to prepare and commit")
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(3)
+print("Epoch 3 initialized")
 assert casper.get_dynasty() == 2
 assert 3 * 10**15 <= casper.get_total_deposits(0) < 4 * 10**15
 assert 3 * 10**15 <= casper.get_total_deposits(1) < 4 * 10**15
 assert 21 * 10**15 <= casper.get_total_deposits(2) < 22 * 10**15
+print("Confirmed new total_deposits")
 try:
     # Try to log out, but sign with the wrong key
     casper.flick_status(0, mk_status_flicker(3, 0, t.k1))
@@ -180,6 +201,7 @@ assert not success
 casper.flick_status(4, mk_status_flicker(3, 0, t.k4))
 casper.flick_status(5, mk_status_flicker(3, 0, t.k5))
 casper.flick_status(6, mk_status_flicker(3, 0, t.k6))
+print("Logged out three validators")
 # Validators leave the fwd validator set in dynasty 4
 assert casper.get_validators__dynasty_end(4) == 4
 epoch_3_anchash = utils.sha3(b'\x30' * 32 + epoch_2_anchash)
@@ -187,24 +209,29 @@ epoch_3_anchash = utils.sha3(b'\x30' * 32 + epoch_2_anchash)
 casper.prepare(0, mk_prepare(3, b'\x30' * 32, epoch_2_anchash, 2, epoch_2_anchash, t.k0))
 # Not prepared yet
 assert not casper.get_consensus_messages__hash_justified(3, b'\x30' * 32)
+print("Prepare from one validator no longer sufficient")
 # Prepare from 3 more validators
 for i, k in ((1, t.k1), (2, t.k2), (3, t.k3)):
     casper.prepare(i, mk_prepare(3, b'\x30' * 32, epoch_2_anchash, 2, epoch_2_anchash, k))
 # Still not prepared
 assert not casper.get_consensus_messages__hash_justified(3, b'\x30' * 32)
+print("Prepare from four of seven validators still not sufficient")
 # Prepare from a firth validator
 casper.prepare(4, mk_prepare(3, b'\x30' * 32, epoch_2_anchash, 2, epoch_2_anchash, t.k4))
 # NOW we're prepared!
 assert casper.get_consensus_messages__hash_justified(3, b'\x30' * 32)
+print("Prepare from five of seven validators sufficient!")
 # Five commits
 for i, k in enumerate([t.k0, t.k1, t.k2, t.k3, t.k4]):
     casper.commit(i, mk_commit(3, b'\x30' * 32, k))
 # And we committed!
 assert casper.get_consensus_messages__committed(3)
+print("Commit from five of seven validators sufficient")
 # Start epoch 4
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(4)
 assert casper.get_dynasty() == 3
+print("Epoch 4 initialized")
 # Prepare and commit
 epoch_4_anchash = utils.sha3(b'\x40' * 32 + epoch_3_anchash)
 for i, k in enumerate([t.k0, t.k1, t.k2, t.k3, t.k4]):
@@ -212,9 +239,11 @@ for i, k in enumerate([t.k0, t.k1, t.k2, t.k3, t.k4]):
 for i, k in enumerate([t.k0, t.k1, t.k2, t.k3, t.k4]):
     casper.commit(i, mk_commit(4, b'\x40' * 32, k))
 assert casper.get_consensus_messages__committed(4)
+print("Prepared and committed")
 # Start epoch 5 / dynasty 4
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(5)
+print("Epoch 5 initialized")
 assert casper.get_dynasty() == 4
 assert 21 * 10**15 <= casper.get_total_deposits(3) <= 22 * 10**15
 assert 12 * 10**15 <= casper.get_total_deposits(4) <= 13 * 10**15
@@ -224,11 +253,13 @@ for i, k in enumerate([t.k0, t.k1, t.k2]):
     casper.prepare(i, mk_prepare(5, b'\x50' * 32, epoch_4_anchash, 4, epoch_4_anchash, k))
 # Three prepares are insufficient because there are still five validators in the rear validator set
 assert not casper.get_consensus_messages__hash_justified(5, b'\x50' * 32)
+print("Three prepares insufficient, as rear validator set still has seven")
 # Do two more prepares
 for i, k in [(3, t.k3), (4, t.k4)]:
     casper.prepare(i, mk_prepare(5, b'\x50' * 32, epoch_4_anchash, 4, epoch_4_anchash, k))
 # Now we're good!
 assert casper.get_consensus_messages__hash_justified(5, b'\x50' * 32)
+print("Five prepares sufficient")
 for i, k in enumerate([t.k0, t.k1, t.k2, t.k3, t.k4]):
     casper.commit(i, mk_commit(5, b'\x50' * 32, k))
 # Committed!
@@ -237,8 +268,10 @@ assert casper.get_consensus_messages__committed(5)
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(6)
 assert casper.get_dynasty() == 5
+print("Epoch 6 initialized")
 # Log back in
 casper.flick_status(4, mk_status_flicker(6, 1, t.k4))
+print("One validator logging back in")
 assert casper.get_validators__dynasty_start(4) == 7
 # Here three prepares and three commits should be sufficient!
 epoch_6_anchash = utils.sha3(b'\x60' * 32 + epoch_5_anchash)
@@ -247,10 +280,12 @@ for i, k in enumerate([t.k0, t.k1, t.k2]):
 for i, k in enumerate([t.k0, t.k1, t.k2]):
     casper.commit(i, mk_commit(6, b'\x60' * 32, k))
 assert casper.get_consensus_messages__committed(6)
+print("Three of four prepares and commits sufficient")
 # Start epoch 7 / dynasty 6
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(7)
 assert casper.get_dynasty() == 6
+print("Epoch 7 initialized")
 # Here three prepares and three commits should be sufficient!
 epoch_7_anchash = utils.sha3(b'\x70' * 32 + epoch_6_anchash)
 for i, k in enumerate([t.k0, t.k1, t.k2]):
@@ -258,10 +293,12 @@ for i, k in enumerate([t.k0, t.k1, t.k2]):
 for i, k in enumerate([t.k0, t.k1, t.k2]):
     casper.commit(i, mk_commit(7, b'\x70' * 32, k))
 assert casper.get_consensus_messages__committed(7)
+print("Three of four prepares and commits sufficient")
 # Start epoch 8 / dynasty 7
 s.state.block_number += EPOCH_LENGTH
 casper.initialize_epoch(8)
 assert casper.get_dynasty() == 7
+print("Epoch 8 initialized")
 assert 12 * 10**15 <= casper.get_total_deposits(6) <= 13 * 10**15
 assert 15 * 10**15 <= casper.get_total_deposits(7) <= 16 * 10**15
 epoch_8_anchash = utils.sha3(b'\x80' * 32 + epoch_7_anchash)
@@ -270,11 +307,16 @@ for i, k in enumerate([t.k0, t.k1, t.k2]):
     casper.prepare(i, mk_prepare(8, b'\x80' * 32, epoch_7_anchash, 7, epoch_7_anchash, k))
 # Three prepares are insufficient because there are still five validators in the rear validator set
 assert not casper.get_consensus_messages__hash_justified(8, b'\x80' * 32)
+print("Three prepares no longer sufficient, as the forward validator set has five validators")
 # Do one more prepare
 for i, k in [(3, t.k3)]:
     casper.prepare(i, mk_prepare(8, b'\x80' * 32, epoch_7_anchash, 7, epoch_7_anchash, k))
 # Now we're good!
 assert casper.get_consensus_messages__hash_justified(8, b'\x80' * 32)
+print("Four of five prepares sufficient")
 for i, k in enumerate([t.k0, t.k1, t.k2, t.k3, t.k4]):
     casper.commit(i, mk_commit(8, b'\x80' * 32, k))
 assert casper.get_consensus_messages__committed(8)
+print("Committed")
+
+print("All tests passed")