{
  "manageEntity": {
    "action": "Save",
    "entityId": "650095376",
    "entityType": "Track",
    "nonce": "0x6c50869b91ebb9b547f4ff16fcf6bbee54dc5620dec00e0f789d6f351cdf6d86",
    "signature": "0x3168c04bb1bb3429a08ce4eabecc22049d531983035363979c4565e596616b805fbb0ed60a9afcd5b864cece21ca53a1ec656dabc07cdcaf3d2c2dcdc9e3bcd51c",
    "signer": "0xc03cf24b1C519dA6a18B6509c7F5C57d01620755",
    "userId": "870665506"
  }
}