Solana is targeting September 9, 2026 to launch its Transaction v1 upgrade, which triples the maximum transaction size from 1,232 bytes to 4,096 bytes. This change allows developers to execute complex operations, such as zero-knowledge proofs and multi-signature payments, in a single atomic transaction. While the upgrade is optional for users, infrastructure providers and block explorers must update their software to recognize the new format and correctly display restructured priority fees.
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