{
  "manageEntity": {
    "action": "Save",
    "entityId": "1372574721",
    "entityType": "Track",
    "nonce": "0xde10452ad5d181dd5cbc1c37ee31775fa08f1b149a43a9a73122c9ebccde34ba",
    "signature": "0xe5e0b0897187208e70e2126be0bca7b8f601b306bceb44b1c72a4ff5e0fb057e3b96f3e70978edef4e79f5bc97a99d80d24f87539b5d0958660012c8a20b06fb1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}