{
  "manageEntity": {
    "action": "Save",
    "entityId": "1774105454",
    "entityType": "Track",
    "nonce": "0xf24a17bcc1a183246aafa52f7a897f2ab8f08c93ec7ad76af39f9fa5ca3ab5fb",
    "signature": "0x529a357ec56aec3803bceedd593ecd7786437601c63ca45549856801ba0b41f865bc3d5d42e8a3af8c508e6cc115a6f1f12a2c16afe4b9f85b46e8faeadb9a4d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}