Transaction not yet indexed

668UEnRLkwf2SySDpAcQBf96jp5cXmcpEETJQyvBZi5PeE67dPfj3Wj8Cda7ebuP9NTJfqFvJmGtMU3U9TmjTreF

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