Transaction not yet indexed

668EXdDExEmCkNb1DLuUpMWSyU1jiup6cb1NFc37rU8iDLirMGVGnHM5BxuGWfZyFNVpMJYwwMgZbB9VepLJYwe1

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