Transaction not yet indexed

668mQuEDCSAxYKq7EM4pXf4ZN6dPsyukN5qajrpHTdBtmxgMphxvkAWHgCGV8j3EfExmq3uH7SmQfNRmnoxJf9Lu

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.