{
  "manageEntity": {
    "action": "Save",
    "entityId": "590020",
    "entityType": "Track",
    "nonce": "0x21de95f8929beec3e016483325c0a610e7a1c6240a7692ccced7d6a2a44ce613",
    "signature": "0xa58ebc29ae8be9033217fcff5be4991e45881af0d89c41f37a430984c53e8be21d710d227973227a74be302edb08a10003a0a7e512a29f8cbe546af44141eea61c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}