{
  "manageEntity": {
    "action": "Save",
    "entityId": "759947396",
    "entityType": "Track",
    "nonce": "0x057b434d0ca3f57618222e0a63d7a5cb8f4241741035f36317f0ba8944478419",
    "signature": "0xdc2b202195b2bcd85ae2d5c040b400f438f5a64f6990b168bb806e9039dc8f123e537043b56ecbb72484c4824630f902b3c38da96d0bada6c0e0810f4da0f9b11c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}