diff --git a/eth2/state_processing/specs/example.yml b/eth2/state_processing/specs/example.yml
index 95b749bc4..982f0b0dd 100644
--- a/eth2/state_processing/specs/example.yml
+++ b/eth2/state_processing/specs/example.yml
@@ -1,205 +1,395 @@
-title: Sanity tests
-summary: Basic sanity checks from phase 0 spec pythonization. All tests are run with
-  `verify_signatures` as set to False.
+title: Sanity tests -- small config -- 32 validators
+summary: Basic sanity checks from phase 0 spec pythonization using a small state configuration and 32 validators.
+    All tests are run with `verify_signatures` as set to False.
+    Tests generated via https://github.com/ethereum/research/blob/master/spec_pythonizer/sanity_check.py
 test_suite: beacon_state
-fork: tchaikovsky
-version: v0.5.0
+fork: phase0-0.5.0
 test_cases:
 - name: test_empty_block_transition
-  config: {SHARD_COUNT: 8, TARGET_COMMITTEE_SIZE: 4, MAX_BALANCE_CHURN_QUOTIENT: 32,
-    MAX_INDICES_PER_SLASHABLE_VOTE: 4096, MAX_EXIT_DEQUEUES_PER_EPOCH: 4, SHUFFLE_ROUND_COUNT: 90,
-    DEPOSIT_CONTRACT_TREE_DEPTH: 32, MIN_DEPOSIT_AMOUNT: 1000000000, MAX_DEPOSIT_AMOUNT: 32000000000,
-    FORK_CHOICE_BALANCE_INCREMENT: 1000000000, EJECTION_BALANCE: 16000000000, GENESIS_FORK_VERSION: 0,
-    GENESIS_SLOT: 4294967296, GENESIS_EPOCH: 536870912, GENESIS_START_SHARD: 0, BLS_WITHDRAWAL_PREFIX_BYTE: 0,
-    SECONDS_PER_SLOT: 6, MIN_ATTESTATION_INCLUSION_DELAY: 2, SLOTS_PER_EPOCH: 8, MIN_SEED_LOOKAHEAD: 1,
-    ACTIVATION_EXIT_DELAY: 4, EPOCHS_PER_ETH1_VOTING_PERIOD: 16, SLOTS_PER_HISTORICAL_ROOT: 64,
-    MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256, PERSISTENT_COMMITTEE_PERIOD: 2048, LATEST_RANDAO_MIXES_LENGTH: 64,
-    LATEST_ACTIVE_INDEX_ROOTS_LENGTH: 64, LATEST_SLASHED_EXIT_LENGTH: 64, BASE_REWARD_QUOTIENT: 32,
-    WHISTLEBLOWER_REWARD_QUOTIENT: 512, ATTESTATION_INCLUSION_REWARD_QUOTIENT: 8,
-    INACTIVITY_PENALTY_QUOTIENT: 16777216, MIN_PENALTY_QUOTIENT: 32, MAX_PROPOSER_SLASHINGS: 16,
-    MAX_ATTESTER_SLASHINGS: 1, MAX_ATTESTATIONS: 128, MAX_DEPOSITS: 16, MAX_VOLUNTARY_EXITS: 16,
-    MAX_TRANSFERS: 16, DOMAIN_BEACON_BLOCK: 0, DOMAIN_RANDAO: 1, DOMAIN_ATTESTATION: 2,
-    DOMAIN_DEPOSIT: 3, DOMAIN_VOLUNTARY_EXIT: 4, DOMAIN_TRANSFER: 5}
+  config:
+    SHARD_COUNT: 8
+    TARGET_COMMITTEE_SIZE: 4
+    MAX_BALANCE_CHURN_QUOTIENT: 32
+    MAX_INDICES_PER_SLASHABLE_VOTE: 4096
+    MAX_EXIT_DEQUEUES_PER_EPOCH: 4
+    SHUFFLE_ROUND_COUNT: 90
+    DEPOSIT_CONTRACT_TREE_DEPTH: 32
+    MIN_DEPOSIT_AMOUNT: 1000000000
+    MAX_DEPOSIT_AMOUNT: 32000000000
+    FORK_CHOICE_BALANCE_INCREMENT: 1000000000
+    EJECTION_BALANCE: 16000000000
+    GENESIS_FORK_VERSION: 0
+    GENESIS_SLOT: 4294967296
+    GENESIS_EPOCH: 536870912
+    GENESIS_START_SHARD: 0
+    BLS_WITHDRAWAL_PREFIX_BYTE: '0x00'
+    SECONDS_PER_SLOT: 6
+    MIN_ATTESTATION_INCLUSION_DELAY: 2
+    SLOTS_PER_EPOCH: 8
+    MIN_SEED_LOOKAHEAD: 1
+    ACTIVATION_EXIT_DELAY: 4
+    EPOCHS_PER_ETH1_VOTING_PERIOD: 16
+    SLOTS_PER_HISTORICAL_ROOT: 64
+    MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+    PERSISTENT_COMMITTEE_PERIOD: 2048
+    LATEST_RANDAO_MIXES_LENGTH: 64
+    LATEST_ACTIVE_INDEX_ROOTS_LENGTH: 64
+    LATEST_SLASHED_EXIT_LENGTH: 64
+    BASE_REWARD_QUOTIENT: 32
+    WHISTLEBLOWER_REWARD_QUOTIENT: 512
+    ATTESTATION_INCLUSION_REWARD_QUOTIENT: 8
+    INACTIVITY_PENALTY_QUOTIENT: 16777216
+    MIN_PENALTY_QUOTIENT: 32
+    MAX_PROPOSER_SLASHINGS: 16
+    MAX_ATTESTER_SLASHINGS: 1
+    MAX_ATTESTATIONS: 128
+    MAX_DEPOSITS: 16
+    MAX_VOLUNTARY_EXITS: 16
+    MAX_TRANSFERS: 16
+    DOMAIN_BEACON_BLOCK: 0
+    DOMAIN_RANDAO: 1
+    DOMAIN_ATTESTATION: 2
+    DOMAIN_DEPOSIT: 3
+    DOMAIN_VOLUNTARY_EXIT: 4
+    DOMAIN_TRANSFER: 5
   verify_signatures: false
   initial_state:
     slot: 4294967296
     genesis_time: 0
-    fork: {previous_version: 0, current_version: 0, epoch: 536870912}
+    fork:
+      previous_version: '0x00000000'
+      current_version: '0x00000000'
+      epoch: 536870912
     validator_registry:
-    - {pubkey: '0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x030000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x060000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x070000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x090000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x0a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x0b0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x0c0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x0d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x0e0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x0f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x120000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x130000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x140000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x150000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x160000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x170000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x180000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x190000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x1a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x1b0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x1c0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x1d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x1e0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    - {pubkey: '0x1f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-      withdrawal_credentials: '0x2222222222222222222222222222222222222222222222222222222222222222',
-      activation_epoch: 536870912, exit_epoch: 18446744073709551615, withdrawable_epoch: 18446744073709551615,
-      initiated_exit: false, slashed: false}
-    validator_balances: [32000000000, 32000000000, 32000000000, 32000000000, 32000000000,
-      32000000000, 32000000000, 32000000000, 32000000000, 32000000000, 32000000000,
-      32000000000, 32000000000, 32000000000, 32000000000, 32000000000, 32000000000,
-      32000000000, 32000000000, 32000000000, 32000000000, 32000000000, 32000000000,
-      32000000000, 32000000000, 32000000000, 32000000000, 32000000000, 32000000000,
-      32000000000, 32000000000, 32000000000]
+    - pubkey: '0x97f1d3a73197d7942695638c4fa9ac0fc3688c4f9774b905a14e3a3f171bac586c55e83ff97a1aeffb3af00adb22c6bb'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000001'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xa572cbea904d67468808c8eb50a9450c9721db309128012543902d0ac358a62ae28f75bb8f1c7c42c39a8c5529bf0f4e'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000002'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x89ece308f9d1f0131765212deca99697b112d61f9be9a5f1f3780a51335b3ff981747a0b2ca2179b96d2c0c9024e5224'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000003'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xac9b60d5afcbd5663a8a44b7c5a02f19e9a77ab0a35bd65809bb5c67ec582c897feb04decc694b13e08587f3ff9b5b60'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000004'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xb0e7791fb972fe014159aa33a98622da3cdc98ff707965e536d8636b5fcc5ac7a91a8c46e59a00dca575af0f18fb13dc'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000005'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xa6e82f6da4520f85c5d27d8f329eccfa05944fd1096b20734c894966d12a9e2a9a9744529d7212d33883113a0cadb909'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000006'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xb928f3beb93519eecf0145da903b40a4c97dca00b21f12ac0df3be9116ef2ef27b2ae6bcd4c5bc2d54ef5a70627efcb7'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000007'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xa85ae765588126f5e860d019c0e26235f567a9c0c0b2d8ff30f3e8d436b1082596e5e7462d20f5be3764fd473e57f9cf'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000008'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x99cdf3807146e68e041314ca93e1fee0991224ec2a74beb2866816fd0826ce7b6263ee31e953a86d1b72cc2215a57793'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000009'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xaf81da25ecf1c84b577fefbedd61077a81dc43b00304015b2b596ab67f00e41c86bb00ebd0f90d4b125eb0539891aeed'
+      withdrawal_credentials: '0x000000000000000000000000000000000000000000000000000000000000000a'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x80fd75ebcc0a21649e3177bcce15426da0e4f25d6828fbf4038d4d7ed3bd4421de3ef61d70f794687b12b2d571971a55'
+      withdrawal_credentials: '0x000000000000000000000000000000000000000000000000000000000000000b'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x8345dd80ffef0eaec8920e39ebb7f5e9ae9c1d6179e9129b705923df7830c67f3690cbc48649d4079eadf5397339580c'
+      withdrawal_credentials: '0x000000000000000000000000000000000000000000000000000000000000000c'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x851f8a0b82a6d86202a61cbc3b0f3db7d19650b914587bde4715ccd372e1e40cab95517779d840416e1679c84a6db24e'
+      withdrawal_credentials: '0x000000000000000000000000000000000000000000000000000000000000000d'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x99bef05aaba1ea467fcbc9c420f5e3153c9d2b5f9bf2c7e2e7f6946f854043627b45b008607b9a9108bb96f3c1c089d3'
+      withdrawal_credentials: '0x000000000000000000000000000000000000000000000000000000000000000e'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x8d9e19b3f4c7c233a6112e5397309f9812a4f61f754f11dd3dcb8b07d55a7b1dfea65f19a1488a14fef9a41495083582'
+      withdrawal_credentials: '0x000000000000000000000000000000000000000000000000000000000000000f'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xa73eb991aa22cdb794da6fcde55a427f0a4df5a4a70de23a988b5e5fc8c4d844f66d990273267a54dd21579b7ba6a086'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000010'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0xb098f178f84fc753a76bb63709e9be91eec3ff5f7f3a5f4836f34fe8a1a6d6c5578d8fd820573cef3a01e2bfef3eaf3a'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000011'
+      activation_epoch: 536870912
+      exit_epoch: 18446744073709551615
+      withdrawable_epoch: 18446744073709551615
+      initiated_exit: false
+      slashed: false
+    - pubkey: '0x9252a4ac3529f8b2b6e8189b95a60b8865f07f9a9b73f98d5df708511d3f68632c4c7d1e2b03e6b1d1e2c01839752ada'
+      withdrawal_credentials: '0x0000000000000000000000000000000000000000000000000000000000000012'
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-      '0xf6b8ca96e524598ba62d563347f5aea6ce2d81d644e2788687e5a92844df1b42']
-    latest_slashed_balances: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
-    latest_block_header: {slot: 4294967296, previous_block_root: '0x0000000000000000000000000000000000000000000000000000000000000000',
-      state_root: '0x0000000000000000000000000000000000000000000000000000000000000000',
-      block_body_root: '0x5359b62990beb1d78e1cec479f5a4d80af84709886a8e16c535dff0556dc0e2d',
-      signature: '0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'}
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - epoch: 536870912
+      crosslink_data_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+    latest_block_roots:
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    latest_state_roots:
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
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+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    - '0x0000000000000000000000000000000000000000000000000000000000000000'
+    latest_active_index_roots:
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    - '0x429a7560eb31fa5d1192496997a78ffc590e70f5b39220abff4420298061501a'
+    latest_slashed_balances:
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
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+    - 0
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+    - 0
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+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    - 0
+    latest_block_header:
+      slot: 4294967296
+      previous_block_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+      state_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+      block_body_root: '0x13f2001ff0ee4a528b3c43f63d70a997aefca990ed8eada2223ee6ec3807f7cc'
+      signature: '0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
     historical_roots: []
-    latest_eth1_data: {deposit_root: '0xb05de6a9059df0c9a2ab5f76708d256941dfe9eb89e6fda549b30713087d2a5e',
-      block_hash: '0x0000000000000000000000000000000000000000000000000000000000000000'}
+    latest_eth1_data:
+      deposit_root: '0x826d25bfcb9161aabc799844c5176f7b3444dc5288856f65e0b8060560488912'
+      block_hash: '0x0000000000000000000000000000000000000000000000000000000000000000'
     eth1_data_votes: []
     deposit_index: 32
   blocks:
   - slot: 4294967297
-    previous_block_root: '0x92ed652508d2b4c109a857107101716b18e257e7ce0d199d4b16232956e9e27e'
+    previous_block_root: '0x2befbd4b4fe8c91f3059082c8048e3376a9b7fb309e93044fac32b7cc8849773'
     state_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
     body:
       randao_reveal: '0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
-      eth1_data: {deposit_root: '0x0000000000000000000000000000000000000000000000000000000000000000',
-        block_hash: '0x0000000000000000000000000000000000000000000000000000000000000000'}
+      eth1_data:
+        deposit_root: '0x0000000000000000000000000000000000000000000000000000000000000000'
+        block_hash: '0x0000000000000000000000000000000000000000000000000000000000000000'
       proposer_slashings: []
       attester_slashings: []
       attestations: []
@@ -344,4 +704,5 @@ test_cases:
       voluntary_exits: []
       transfers: []
     signature: '0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
-  expected_state: {slot: 4294967297}
+  expected_state:
+    slot: 4294967297
diff --git a/eth2/state_processing/tests/tests.rs b/eth2/state_processing/tests/tests.rs
index 9cee7b34c..ae5b4c145 100644
--- a/eth2/state_processing/tests/tests.rs
+++ b/eth2/state_processing/tests/tests.rs
@@ -20,7 +20,6 @@ pub struct TestDoc {
 }
 
 #[test]
-#[ignore]
 fn yaml() {
     use serde_yaml;
     use std::{fs::File, io::prelude::*, path::PathBuf};
diff --git a/eth2/types/Cargo.toml b/eth2/types/Cargo.toml
index 27aef19d6..6b6c23746 100644
--- a/eth2/types/Cargo.toml
+++ b/eth2/types/Cargo.toml
@@ -10,6 +10,7 @@ boolean-bitfield = { path = "../utils/boolean-bitfield" }
 dirs = "1.0"
 ethereum-types = "0.5"
 hashing = { path = "../utils/hashing" }
+hex = "0.3"
 honey-badger-split =  { path = "../utils/honey-badger-split" }
 int_to_bytes = { path = "../utils/int_to_bytes" }
 log = "0.4"
diff --git a/eth2/types/src/chain_spec.rs b/eth2/types/src/chain_spec.rs
index cfb88bcb8..0f1db2aa4 100644
--- a/eth2/types/src/chain_spec.rs
+++ b/eth2/types/src/chain_spec.rs
@@ -2,6 +2,7 @@ use crate::*;
 use bls::Signature;
 use int_to_bytes::int_to_bytes4;
 use serde_derive::Deserialize;
+use test_utils::u8_from_hex_str;
 
 const GWEI: u64 = 1_000_000_000;
 
@@ -57,6 +58,7 @@ pub struct ChainSpec {
     pub far_future_epoch: Epoch,
     pub zero_hash: Hash256,
     pub empty_signature: Signature,
+    #[serde(deserialize_with = "u8_from_hex_str")]
     pub bls_withdrawal_prefix_byte: u8,
 
     /*
diff --git a/eth2/types/src/fork.rs b/eth2/types/src/fork.rs
index b780b95ef..f6ef96b88 100644
--- a/eth2/types/src/fork.rs
+++ b/eth2/types/src/fork.rs
@@ -1,4 +1,4 @@
-use crate::{test_utils::TestRandom, ChainSpec, Epoch};
+use crate::{test_utils::{fork_from_hex_str, TestRandom}, ChainSpec, Epoch};
 use int_to_bytes::int_to_bytes4;
 use rand::RngCore;
 use serde_derive::{Deserialize, Serialize};
@@ -12,7 +12,9 @@ use test_random_derive::TestRandom;
     Debug, Clone, PartialEq, Default, Serialize, Deserialize, Encode, Decode, TreeHash, TestRandom,
 )]
 pub struct Fork {
+    #[serde(deserialize_with = "fork_from_hex_str")]
     pub previous_version: [u8; 4],
+    #[serde(deserialize_with = "fork_from_hex_str")]
     pub current_version: [u8; 4],
     pub epoch: Epoch,
 }
diff --git a/eth2/types/src/test_utils/mod.rs b/eth2/types/src/test_utils/mod.rs
index bc8da0548..018b70d15 100644
--- a/eth2/types/src/test_utils/mod.rs
+++ b/eth2/types/src/test_utils/mod.rs
@@ -2,6 +2,7 @@
 mod macros;
 mod generate_deterministic_keypairs;
 mod keypairs_file;
+mod serde_utils;
 mod test_random;
 mod testing_attestation_builder;
 mod testing_attestation_data_builder;
@@ -17,6 +18,7 @@ mod testing_voluntary_exit_builder;
 pub use generate_deterministic_keypairs::generate_deterministic_keypairs;
 pub use keypairs_file::KeypairsFile;
 pub use rand::{prng::XorShiftRng, SeedableRng};
+pub use serde_utils::{fork_from_hex_str, u8_from_hex_str};
 pub use test_random::TestRandom;
 pub use testing_attestation_builder::TestingAttestationBuilder;
 pub use testing_attestation_data_builder::TestingAttestationDataBuilder;
diff --git a/eth2/types/src/test_utils/serde_utils.rs b/eth2/types/src/test_utils/serde_utils.rs
new file mode 100644
index 000000000..bcc34b150
--- /dev/null
+++ b/eth2/types/src/test_utils/serde_utils.rs
@@ -0,0 +1,28 @@
+use serde::{Deserialize, Deserializer};
+use serde::de::Error;
+
+pub fn u8_from_hex_str<'de, D>(deserializer: D) -> Result<u8, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s: String = Deserialize::deserialize(deserializer)?;
+
+    u8::from_str_radix(&s.as_str()[2..], 16).map_err(D::Error::custom)
+}
+
+pub fn fork_from_hex_str<'de, D>(deserializer: D) -> Result<[u8; 4], D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s: String = Deserialize::deserialize(deserializer)?;
+    let mut array = [0 as u8; 4];
+    let decoded: Vec<u8> = hex::decode(&s.as_str()[2..]).map_err(D::Error::custom)?;
+
+    for (i, item) in array.iter_mut().enumerate() {
+        if i > decoded.len() {
+            break;
+        }
+        *item = decoded[i];
+    }
+    Ok(array)
+}
diff --git a/eth2/utils/bls/src/serde_vistors.rs b/eth2/utils/bls/src/serde_vistors.rs
index 55eadb883..aa9bdd1ae 100644
--- a/eth2/utils/bls/src/serde_vistors.rs
+++ b/eth2/utils/bls/src/serde_vistors.rs
@@ -8,13 +8,13 @@ impl<'de> Visitor<'de> for HexVisitor {
     type Value = Vec<u8>;
 
     fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        formatter.write_str("a hex string (without 0x prefix)")
+        formatter.write_str("a hex string (irrelevant of prefix)")
     }
 
     fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
     where
         E: de::Error,
     {
-        Ok(hex::decode(value).map_err(|e| de::Error::custom(format!("invalid hex ({:?})", e)))?)
+        Ok(hex::decode(value.trim_start_matches("0x")).map_err(|e| de::Error::custom(format!("invalid hex ({:?})", e)))?)
     }
 }
diff --git a/eth2/utils/bls/src/signature.rs b/eth2/utils/bls/src/signature.rs
index 47598bc66..d2aac3fac 100644
--- a/eth2/utils/bls/src/signature.rs
+++ b/eth2/utils/bls/src/signature.rs
@@ -73,7 +73,7 @@ impl Encodable for Signature {
 impl Decodable for Signature {
     fn ssz_decode(bytes: &[u8], i: usize) -> Result<(Self, usize), DecodeError> {
         let (sig_bytes, i) = decode_ssz_list(bytes, i)?;
-        let raw_sig = RawSignature::from_bytes(&sig_bytes).map_err(|_| DecodeError::TooShort)?;
+        let raw_sig = RawSignature::from_bytes(&sig_bytes).map_err(|_| DecodeError::Invalid)?;
         Ok((Signature(raw_sig), i))
     }
 }