{
  "manageEntity": {
    "action": "Save",
    "entityId": "647116569",
    "entityType": "Track",
    "nonce": "0x3a3122b8f06a1944f7de0e2f85de979fb806ef4a1d9b4f3da901e08a1338e3cc",
    "signature": "0x2df3ef7a98e9012c3a81dda299cb45760c6b83c2c71870d5c15f7950910041cd46a9ef82e1636eeda866a8403a2396d29289ba0fa881aafb3a2641d8d048a3591b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}