{
  "manageEntity": {
    "action": "Save",
    "entityId": "497877731",
    "entityType": "Track",
    "nonce": "0xcbed15356adce640d4fa6cf1923532c07eeaa1bdb212234d2e89fd02f69c4383",
    "signature": "0x99b575059974708e530543a6f3a9cd1a1c636445e14027a375e1d3d56723af0007ef0836dcb16453956de2dc11d264496f8a31532c4c4fe8e18a1c10e45cd2511b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}