{
  "manageEntity": {
    "action": "Save",
    "entityId": "455988898",
    "entityType": "Track",
    "nonce": "0xa86dcbdec9cb6e7d83551a338c294ad3cfa46fd6ac097dacb48a5ab66127ec53",
    "signature": "0xeba312e65f17cfeb52ebeb67bb2e479d665236a31b1abee9b4eef4cfb0ebd1680ba94e0d8042c62e88e8cbd117e3fd3e0e0c1739b6cae33d91244ba2987e7f191c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}