{
  "manageEntity": {
    "action": "Save",
    "entityId": "150085695",
    "entityType": "Track",
    "nonce": "0x7905ac6f42c7e54d3126ad23894c1031f3ed7c24756aa4a7dfb9ecee51011a00",
    "signature": "0xa572077111ac6ea19c3a1f75159e838687d6b6ab6755ff8c0fae9e995e7b148c7e67eb47a631ba815059baf2a910b91534c96905ab3053c8368d6c8dcb7da4c51b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}