{
  "manageEntity": {
    "action": "Save",
    "entityId": "556210696",
    "entityType": "Track",
    "nonce": "0xbd73ed973f459f50c6342a60d04426f0c786d838858f09b51c87e32b6065407a",
    "signature": "0xe4e662e19e62209afabf749a3263f7c9cb985a8dd0b8a7c56bf60598b97a45a90b84d2ea77a2079958cf9de1cb5417777a425b45b1309a7b9524e52662b722b11b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}