{
  "manageEntity": {
    "action": "Save",
    "entityId": "869258712",
    "entityType": "Track",
    "nonce": "0x60afe93c94da853c47cb030ce6f3c64d0a983c18c2a6bb888b96453f536ada0a",
    "signature": "0x52ea5da60f3a36f681e6f5e5d0a27d5fc5e00e0b5e1c15ee89d33fd3ac4695ed6675e26f632a15624d66d0a65e22d45e0bdafd38162787a3d9ca1b9cc021b6b41c",
    "signer": "0xc1C84e5C06F7dc5824672906AC6E51CDfeb90aeA",
    "userId": "447798047"
  }
}