{
  "manageEntity": {
    "action": "Save",
    "entityId": "648042064",
    "entityType": "Track",
    "nonce": "0x963e840ad7c9d94d8459a823d46be22a324d973eeb475601c04b55a59eb23b9e",
    "signature": "0x28fb3319ecee63577a8d70a26179c2bde5430ddd6e7568c45d1568dd05e52cba4c8422f0cb8bc2c2b3cdd9bdfeadb6c16064f8f15562f8ed86907b0819c3a9dc1b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}