{
  "manageEntity": {
    "action": "Save",
    "entityId": "1604891923",
    "entityType": "Track",
    "nonce": "0x02d0677d80dcf506e73ab066a1608f911b87b49751199361f5695685a8d81ee5",
    "signature": "0x835507b4b8fc94cb82cced6ffc6e4b448f40800f864cfd835c5a2422c422154160c7bfdc7bd782aca9ed5656deedfe0b98c4fed98fcf1ef589b60ed36f4a9aeb1b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}