{
  "manageEntity": {
    "action": "Save",
    "entityId": "785249164",
    "entityType": "Track",
    "nonce": "0x7c5f87ed2c49a247250c6dcd3a425d1b8319851896421f0060ac3e3865086514",
    "signature": "0x5225945fbd719d4bddff3a0584756f21179418d00afe57667b82e7fa732eef68060a800de4a60d124a8e7bea734aea578e59c15f6465a724cc610885126415a81c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}