{
  "manageEntity": {
    "action": "Save",
    "entityId": "1250383415",
    "entityType": "Track",
    "nonce": "0xbf9784c7f262ea97951d5526be90e54a58e81d13996f9e9ef9785a64d585bbaa",
    "signature": "0x6221efb0697ccdb72346a0d5aa6a5ca20f0ad6c2362eeb74fdb309feecdccf1f7a0262f01b8b75d9c1abd986c35d9f93e36ebcc4f8c3a7fc60d113896ff5c7461b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}