{
  "manageEntity": {
    "action": "Save",
    "entityId": "253548",
    "entityType": "Track",
    "nonce": "0x6f55003e04ba01e4498c9e00d0d8e9dbd5c7dd5751e0a2f1e64e0a15a68995f9",
    "signature": "0x375058d20bb7ca47e1341ac0bca9f1b26698d9e3a730227f337065514b0151ca78ea1b66898082121a827054d87ab5e0e0de95f88314923b1a693cd729179a931c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}