{
  "manageEntity": {
    "action": "Save",
    "entityId": "409102",
    "entityType": "Track",
    "nonce": "0xb8660084f54d1e3be586a70459ef47cc7f368c74d2a3d2a8dbf6fd4390631f65",
    "signature": "0x9fcfc3db0422c8f92b2bfeccd6f9ef3d8135294f727d2d8fd150a567c84f0dba014787cafb7210aee59d652085abe8a2db77e315b8a5697d99898ec59ef226691c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}