Ethereum layer-2 network Base has applied its third mainnet upgrade, dubbed Cobalt. The upgrade adds validity transactions and B20 asset features. Validity transactions let users submit a transaction in advance and have it execute only when specified conditions are met, with an optional expiry for each transaction. The B20 standard adds composite policies and supports scheduled adjustments to how balances are displayed, and a new tool for administrators when asset seizure is enabled. Base also plans to cut block times and add protocol-level support for several features.

Sivar, a stablecoin-based service supporting remittances between El Salvador and the United States, has launched nationwide. Modveon said it develops, operates and expands the service under a five-year contract with El Salvador public agency AAB. Coinbase provides the payments infrastructure, with transactions settled in stablecoins on Ethereum layer-2 Base. Remittances carry a flat $2 fee, with a $25 minimum. Accounts differ over direct government operation.