Transaction not yet indexed

a688MfQkdG8pFQ2TUneMTEsvR8ugVwrSyCaw63ZUJA5nnJ4yL2tVKhFSTysiK1hyg8R8r1fZPMhntrAAM8RDT5w

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