{
  "manageEntity": {
    "action": "Save",
    "entityId": "707487947",
    "entityType": "Track",
    "nonce": "0x38a9dc951436e49a7df7955ecfdc90c0e99ec518acda18c45a846778d7a63e89",
    "signature": "0xa2b9920a1387d4bdd6009d83c1587d5ec38cdf35714fac71cef9a445b90d065f7b31a6e7568a759eda2623ecdab6643a2df58fbcb72bac71d5e987971e5cc1ff1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}