{
  "manageEntity": {
    "action": "Save",
    "entityId": "266707",
    "entityType": "Track",
    "nonce": "0x680d89d02944a220c48e943ac1619b786f110e32b4d903506df5ada5581c8cc8",
    "signature": "0x4bdddb0c643cfdf698e2db9aabd85cac5ef6cb2f1fb2ce3c99027314f43b90202f76be9ab369a647f44284f5cb8e6ebcd2440e16441ce14849cb1904579f603d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}