Transaction not yet indexed

521SWYWTeEVcK4746aLdmac4b7LmTksNmCqW9kDmtmcbeAHPSPY7BS4FymiDU88UjGPxxZKFwCr6XkeuBUEhRqPp

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