Transaction not yet indexed

638u8mphhkFmRXHzF4mVQKtQaT5mNSeFqjBchqW3ChLBtpKzYGu7JF2ZQQLpugUBEgSxXYFudfbDfLTvqMqCkCK1

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