Transaction not yet indexed

668VBcWBqHXpx3MTFHnHJFky1sS7s2WwUPVwFMFtyXLxtSrJbKSWR4SyE6Kfnuj1TFFh3SceJwTWhpK5mijUivgi

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