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"The testing requirements for Ethereum are greater than any other project we've come across."
- security auditor

Ethereum Blockchain

Complete, Audited

• block headers (encapsulation of the state of canonical chain)
• transactions (interface for calling EVM and xfer of value)
• state database (encapsulation of state)
• provisioned, turing complete contract execution (EVM)
• execution limited by available gas provision
• recursion limited to 1024
• floating gas price (execCost = gasPrice * codeCost)
• modified GHOST protocol and implementation (uncle blocks)
• block & transaction relay and synchronization (wireline protocol)
• ethash proof of work (BFT consensus protocol)
• p2p network (connectivity)

Pending Audit

Work in Progress

• state database pruning
• transaction processing w/stake-based proofing
• network improvements (robustness, context)
• RANDAO

Known Limitations (sub-optimal, require metrics, models, and/or proofs)

• optimal gas price (bootstrapped value; currently 50 gwei)
• dynamic gas price (current clients have static floor)
• optimal target-gas limit
• dynamic target-gas limit
• timestamp mechanic (robustness; connected to difficulty)
• difficulty adjustment (robustness; connected to timestamp)