{
  "manageEntity": {
    "action": "Save",
    "entityId": "748759982",
    "entityType": "Track",
    "nonce": "0x77ad869f8b0e940fddd0ec819f5bf4268a514ba94b6ecc96d3ab34beb7cab7aa",
    "signature": "0x7fb281042074d77a2b77601653c781829add0de087844515d683f2158282f62203653c0c08af18db18f08d73cb9545592f31eaaed2572d6566f8a0a3151776a01c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}