Cross-chain communication relies on standardized protocols, interoperable data formats, and verifiable state proofs to move value and data across heterogeneous networks. Bridges, relays, and consensus-bridging coordinate transfers, proofs, and finality timelines while balancing security, latency, and throughput. Design choices govern…

Double spending risks arise when a digital token is spent more than once. Blockchain mitigates this through a tamper-evident ledger where each block anchors to the previous via cryptographic hashes. Transactions gain legitimacy only after network-wide verification and sufficient confirmations.…