* Return default values when account, slot or code doesn't exist.
* Handle case when storage doesn't exist due to account not existing or being a non contract account.
* Update state network to use addressHash instead of address in contract trie and contract code content keys.
* Fix path calculation bug in getParent when working with extension nodes.
* Bump portal spec tests repo.
* Finish updating tests due to portal test vector changes.
* Update Fluffy state bridge to use addressHash.
* Update Fluffy book with correct commands for running portal hive tests.
* Use RPC batching to send offer requests and filter out duplicate offers.
* Lookup offers after gossip to check if gossip successful.
* Use multiple workers for gossiping offers.
* Update Fluffy state network logging.
* Use single RPC calls instead of batching.
* Update cli parameters.
* Fix bug in contract trie offer building.
* Create block offers queue and collect account preimages.
* Implement iterators to return account and storage proofs and bytecode from updatedCaches.
* Implement building offers from proofs.
* Refactor BlockDataRef type to only include required fields.
* Store block data in database.
* Improve state diff types.
* Implement start state backfill from specific block.
* Record last persisted block number in database.
* Persist account preimages in db.
* Apply state updates for DAO hard fork.
* Implement state gossip of block offers via portal JSON RPC.
* Started state bridge.
* Implement call to fetch stateDiffs using trace_replayBlockTransactions.
* Convert JSON responses to stateDiff types.
* State updates working for first few blocks.
* Correctly building state for first 200K blocks.
* Add storage of code and cleanup.
* Start state bridge refactor.
* More cleanup and fixes.
* Use RocksDb as backend for state.
* Implement transactions.
* Build RocksDb dependency when building fluffy tools.
* Move code to world state helper.
* Implement producer and consumer queue.
* Cleanup exceptions.
* Improve logging.
* Add update caches to DatabaseRef backends.
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