{
  "manageEntity": {
    "action": "Save",
    "entityId": "450190671",
    "entityType": "Track",
    "nonce": "0x92cd36d988872ec72ac4816537bf63f4f1a10e55d459deef9737c7e1dcbb1b1d",
    "signature": "0x6c442173256782cc25814920012a679c39e46ce01881feed37400f4e7c343ac063be7d3f21a96cde4be9bdf091fcded6d67c76380b079bc6ce85b377a0d5aa421c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}