{
  "manageEntity": {
    "action": "Save",
    "entityId": "752053",
    "entityType": "Track",
    "nonce": "0x280ff0aa04bf557075d707094d02507ecb10b4ae3e070f326ae09f7988f9679f",
    "signature": "0xeb9d9cc7de62789ae1c0e2ecf001241981ee0dce1a48b3a506784128425cee7e0e6286519421f54168e698c7f436707548546117cf4736ae69ed506d1428803f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}