{
  "manageEntity": {
    "action": "Save",
    "entityId": "326189515",
    "entityType": "Track",
    "nonce": "0x748c39aa704464646103080dbe0946e630830b3bebee9d45ed2567c5936035a0",
    "signature": "0x8c96eaaec8dd038a277e47f468a0d3499b1663fb60fcd132d9dc42604267007b5bc81f55550d772675a811374f8205e5c68b135db1d17f9fd4ae05c7f74dbc431c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}