{
  "manageEntity": {
    "action": "Save",
    "entityId": "258696679",
    "entityType": "Track",
    "nonce": "0x685dcab8fdbdb9be40c0ef26ab58d35860e44d926708f2480e5e7b4c7f50e67d",
    "signature": "0x7ad4f99fab75a790e71ed1270c8a8bb4912d3c46b91278c4d9115840384d23244e4eb789e8cae38d44df188a1ceef31a3fa822d18b61d90b876072a5a42de10e1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}