{
  "manageEntity": {
    "action": "Save",
    "entityId": "1923995138",
    "entityType": "Track",
    "nonce": "1788456062136829698",
    "signature": "0x514f16d2100009f1fec2f5eb1d05e4a7f4e7df6b92c9740a68692840e73c5ec05ec30e999918bf884a3fbeaea0a8d62b1f02ef0199d9d05014ddbc86bebe76291b",
    "signer": "0xF1f4D1515EDE23445C949c6a8dBaE8a064153588",
    "userId": "199729601"
  }
}