{
  "manageEntity": {
    "action": "Save",
    "entityId": "819850548",
    "entityType": "Track",
    "nonce": "0x47ad2027b3a834260f3ff6231d6655a26bbb088688016d1517b53bd22cf34a36",
    "signature": "0xb6e036ee69d360f52584af0599b18f8b1977e2362b1ab181de83681031d4bee83e2e2114f5f9f8cebf11bda4ae1bb972b59a8340e3f5e14fc23bbbd1634325b11b",
    "signer": "0x1d40C5a13E7f58b0e4d0aB535b167f8e77FC814d",
    "userId": "203043806"
  }
}