{
  "manageEntity": {
    "action": "Save",
    "entityId": "459775991",
    "entityType": "Track",
    "nonce": "0x5651bb6c4d7c975b7ea1b33a7ee2191b9831c726f1d8b2ce98862da3fc3633b4",
    "signature": "0x4861b6367a7e6aeb24eb63dd6951c4da909166a84fbcf29b43e6959fa94a5f8d008115227610efb548ba3b04349461f650feef0537cb0ae24fefc0d7de5490031b",
    "signer": "0xC9e4fe89311517E71e968f6DE26A6c075A639F41",
    "userId": "964899801"
  }
}