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qëð|X^ºY¿ßD*L¬Instant would be the best buzzword. Transactions with X number of confirmations would be "guaranteed / trusted / locked transactions", but it insinuate instant tx are not..
https://whatsonchain.com/tx/c1029ef896536af8102e82f653dc25275ef6de23220732d2a34dff7706c2e4c5