{
  "manageEntity": {
    "action": "Save",
    "entityId": "645307839",
    "entityType": "Track",
    "nonce": "1792683612959929381",
    "signature": "0x525fe172e9e58477c2fae2f9a476d4c7f287da97edaf3dff2aa2eda84aaad2807509463050e4b245621de1fc88e9e064f22374a8a7bdebd1d2a7c027615f94d01b",
    "signer": "0x23dF8876fD80368D375d911e3CbDFd15B8e85CB5",
    "userId": "827420993"
  }
}