{
  "manageEntity": {
    "action": "Save",
    "entityId": "1748628228",
    "entityType": "Track",
    "nonce": "0xb819e07282cee66f81f1eb63cc1f3233c7bdf5da5c864ebc790b12fa95e1c4b9",
    "signature": "0x5eb15fd2d99d27986eaf1b83e4c07fbc54a55cb3516fe79f93f0eb382b9aa4724cb4a78738e0176daa214eed15404df1cb40a372e92ec56d6985a00c7ca24c471b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}