{
  "manageEntity": {
    "action": "Save",
    "entityId": "463294807",
    "entityType": "Track",
    "nonce": "0x540ba8d224801e80ef20ee5f7f45422aed57919a29bef97b9c800ba81d17b1d9",
    "signature": "0xa7b852a4d3429c87a61e75a14b3d9105d889e6639a4548cb8ff72597d567aa8d2d5caf80dc78a1fd52577a01ab80efdfc5d5e6ee19f21e320f16f6cf5b8e87891b",
    "signer": "0x7e1F8Ad5AC71ff7ECFaaB54D7C2Ca8C373DeD528",
    "userId": "674981811"
  }
}