{
  "manageEntity": {
    "action": "Save",
    "entityId": "1429440386",
    "entityType": "Track",
    "nonce": "0x6f1c2f4850d564e52dd1febdb15419050566351e30348e4105a76613066c6f52",
    "signature": "0x74cb0842ea4c972e8083a9067f65a0b41ec305964e40ca7854d0949b7e0a5edb5a0a6607535f234c0691d387b4df2d0aed55e7c43f0c8835fcd8ddfd842543941c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}