{
  "manageEntity": {
    "action": "Save",
    "entityId": "576502479",
    "entityType": "Track",
    "nonce": "0x80f65f970b59230a0916ecbe99a0891efa649e3f84bbd81cdc9cf49e2295125f",
    "signature": "0x5a39a364d9e87eaa3524ea42ebe933b5394db7ff6d4aa22df2447389b1d9c8255ac762886d700c2aa548c0876ba1839194921a2fd8926249d69fde729a65efcd1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}