{
  "manageEntity": {
    "action": "Save",
    "entityId": "591117290",
    "entityType": "Track",
    "nonce": "0x31f61ab1971b430d6cd2af0a6e65a36bc0250bee264532f3cca057e1bff6e9df",
    "signature": "0xf6260d3e302335692d73231ca437c95cba6d1c2afcff4e1c0dd9f003da2d5f903c4fc44810155fd12e65c311cd1efd1654ed97d89aa52f6cead0bfdbc5bc7ea81b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}