{
  "manageEntity": {
    "action": "Save",
    "entityId": "1441490331",
    "entityType": "Track",
    "nonce": "0x3e55cd60d231f5a4c84fd031f3c13865b3ece03a09ad4b939792e2668299eda5",
    "signature": "0x6440b46432df6862f83faad0acef22f05e9f158d55aeb35e26786a1770ae3b2446fb64a6f627a01784e985d41c3524f564fe574670c4d7020791ec24a7e1a76c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}