{
  "manageEntity": {
    "action": "Save",
    "entityId": "439795043",
    "entityType": "Track",
    "nonce": "0x0b142a1541574f4e1269fce98c3b67052181a8533e4ac90bcfba3bc228ff806b",
    "signature": "0xe8a03aa4ebb71fb267d1dca6caa4561868d73bc23ce5e4c4ebda7bce49ea5b5c547d37dc1d1e443d74646e6651278ef7b898a70c8ca27062bc181386c218da871c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}