Nitro is a significant technical upgrade, bringing changes across the stack that dramatically improve the experience of building on Arbitrum

• Advanced Calldata Compression, which further drives down transaction costs on Arbitrum by reducing the amount of data posted to L1.

• Ethereum L1 Gas Compatibility, bringing pricing and accounting for EVM operations perfectly in line with Ethereum.

• Additional L1 Interoperability, including tighter synchronization with L1 Block numbers, and full support for all Ethereum L1 precompiles.

• Safe Retryables, eliminating the failure mode where a retryable ticket fails to get created.

• Geth Tracing, for even broader debugging support.

• And many, many more changes.