{
  "manageEntity": {
    "action": "Save",
    "entityId": "138148",
    "entityType": "Track",
    "nonce": "0x4661700de6f7292001b23603a253886babb95e1b6e2ecd454005b7f1beccfe57",
    "signature": "0xc84e579d2ace93ce6b0bb0afd604124ca498200f187115dad08dc1fe6a0f14f22b306189519c5a8d5f4b9bfcf37fdcdf0194b4ae6ab84660a7660ad4c379cde41c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}