The melbootstrap crate contains bootstrap information for Themelio clients. In particular, it provides

• Hardcoded bootstrap nodes for joining the replica peer-to-peer network
• Hardcoded checkpoints: known block hashes / heights for both the testnet and mainnet. This is required for correct functionality due to "weak subjectivity". In short, without a somewhat recent (within 70 days / 200,000 blocks) known block height, blocks cannot be validated in a trustworthy manner.