{
  "manageEntity": {
    "action": "Save",
    "entityId": "1462912056",
    "entityType": "Track",
    "nonce": "0xa1edd83f669347e949272d6eeb849999bab83b1f8be8784cf094121fda843510",
    "signature": "0x5dbfd5624635a86f09ab7f0fde10b232f2f982eb5ded4e2f7646ddd8d06470424223a6b5bfd84b4322c115ac3d345072cbb0704e6613df59bda4a2c756b0d66c1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}