{
  "manageEntity": {
    "action": "Save",
    "entityId": "543972270",
    "entityType": "Track",
    "nonce": "0x9abff46d2d915ea0b90b6f9708920b90720f86940a0c6b3d3270126b0c43f8c7",
    "signature": "0xc5cf53ddbc71d51954041fdf0074c904b830fa38ed0babe9ea62f8f90702b6a60df935373c1edf1003d84d24f176cb65e04e91c9ada013695bb2d8d528ee5f3f1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}