{
  "manageEntity": {
    "action": "Save",
    "entityId": "341990",
    "entityType": "Track",
    "nonce": "0xd97157213367d6e275d153cb5ce3a87f91c0ba8cda249c2fb7092145240319ad",
    "signature": "0xe0cbab8f0b2fa70b9843ee7b80d3fd8997dc59a4fd7d49640fd2b243b980138130cda7c0b252349d45d2bfa4816d9d7f9df92c0eecddc12c9e3c055f36133a7d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}