{
  "manageEntity": {
    "action": "Save",
    "entityId": "1391296228",
    "entityType": "Track",
    "nonce": "0x65985b8fd29a0e5260fdf7990ed1d0673334b97d705a38dae4d3fe99dc1931de",
    "signature": "0x16dde47e09101cea548563b0ca7d0e915a15750607d145adfd826cf67db1a39a57c89a58d9f74a9c057defab3b866d436897e932040dfc4b4208d50e29005c641b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}