{
  "manageEntity": {
    "action": "Save",
    "entityId": "649420580",
    "entityType": "Track",
    "nonce": "0x89d8a401c9726bd892b7ec38c321c3cec5519697fa4beb87bc964bccc79c50c3",
    "signature": "0xa64f6a75bcd168121d4a63ab860892c771493c98cccfd0ebbf2995dd0ad92a2203731ffbe09e4636919212ce139dcae901b6aca2b1541c72dd08a102e4e7f1331c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}