{
  "manageEntity": {
    "action": "Save",
    "entityId": "821909909",
    "entityType": "Track",
    "nonce": "0xd8598bfbc6543a164dfa7072f1760d61826c401d0ea5505dd45ed45fe3a209bd",
    "signature": "0xd56f7e1bd5be8c6f7ba29ae502e68768ae85051169fb642d82d796cc522edfb03e81e64eccd6fc562fc83d2c6a6edf25b118034adfcf0796143e76caddcb06841b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}