{
  "manageEntity": {
    "action": "Save",
    "entityId": "1587403739",
    "entityType": "Track",
    "nonce": "0x01bb462f3fb4668c56352c0b798e90eb7fc599035ebe133971182a1d89a20164",
    "signature": "0xbb4c21c661267fdbf8c1325dab4c9dacfdd69d92e920af0b28b7dc7d5375706f2237acadd18beb29e1d365f5b3e37e7dd3662903a0a5fdefdefd287ec6b154221c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}