{
  "manageEntity": {
    "action": "Save",
    "entityId": "953132789",
    "entityType": "Track",
    "nonce": "0x9142a5623850e37b2e3ae00323cf998b72cb5b814f378fa442512f21ae291103",
    "signature": "0x9b268c8d0daa82c17303df1ba8c844a11577fe071a51279b1c14594ffd8eec9a32da609e8b88cc83524f494d9565523ad5419a36c7b2dffa37ffb62dd3c1dea41b",
    "signer": "0xC9e4fe89311517E71e968f6DE26A6c075A639F41",
    "userId": "964899801"
  }
}