Dual Data Posting Mechanisms

AnyTrust introduces dual methods for posting data blocks on L1. In addition to the conventional approach of posting full data blocks, it allows for the posting of DACerts, which prove data availability. The L1 inbox contract verifies the validity of DACerts, including reference to the valid Keyset specified within the DACert.

L2 code, responsible for reading data from the inbox, is designed to handle both data formats seamlessly. When encountering a DACert, it performs validity checks, including ensuring the number of signers meets the Keyset requirements, validating the aggregated signature, and verifying that the expiration time extends beyond the current L2 timestamp. Valid DACerts ensure that the data block is accessible and can be utilized by the L2 code.