Transaction not yet indexed

6688D87NRZsXPENbPQLHArLShupSEdAnjbGqEm6V5jsoHVgPBjNrSm71zmWCPkLsFb8bM11FBNcqVCcynP2UnDv5

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