Transaction not yet indexed

668dMQ9815Cm2iKKudQLsAAKQv8kY5uqNzv3iRtqVUVBPcBYX2hi7htPTSwQEHQPXxMr8gN6vKxAkZCrA2HaDG23

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