Attribute-based　searchable　encryption　(ABSE)　is　a　promising　encryption　mechanism　for　sharing　outsourced　encrypted　data　in　clouds,　allowing　fine-grained　access　control　over　data　while　searching　for　encrypted　data.　However,　the　access　policy　in　the　most　existing　ABSE　schemes　exists　in　plaintext,　which　could　expose　sensitive　information　about　legitimate　data　users.　Moreover,　such　schemes　delegate　complex　search　operations　to　a　cloud　server,　which　can　lead　to　data　tampering　and　even　untrusted　results,　and　single　point　of　failure.　In　this　paper,　we　propose　a　blockchain-based　anonymous　attribute-based　searchable　encryption　scheme　for　data　sharing　(BADS).　First,　attributes　of　the　access　policy　are　hidden,　thus　providing　confidentiality　to　the　set　of　attributes　that　satisfy　the　access　policy.　Then　combining　ABSE　with　blockchain　have　features　of　tamper-proof,　integrity　verification　and　non-repudiation.　In　particular,　information　such　as　secure　index　is　stored　in　blockchain,　while　encrypted　data　is　stored　in　a　distributed　system　called　the　InterPlanetary　File　System　(IPFS)　to　avoid　single　point　of　failure.　Finally,　BADS　supports　the　matching　algorithm　that　perform　a　fixed　number　of　pairing　operations　before　searching　algorithm.　We　analysis　security　and　evaluate　performance　to　show　the　efficiency　and　practicability　of　BADS.　IEEE