{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554866529",
    "entityType": "Track",
    "nonce": "0x60aa6a2a5bef5ff2f38347f06fee90eef0755e08b3c2ce56cc7c91bea2d385a8",
    "signature": "0x2942b4a8fdf365e574f7f836d8a553caf35150c4f841bacf585454aa542223353730f76d0cec0096a1686cd5376163a34c315e1ae3908c800b5daed8af8dcfc81b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}