{
  "manageEntity": {
    "action": "Save",
    "entityId": "423784200",
    "entityType": "Track",
    "nonce": "0xa61fac06d110ca035a9bcb90f45a48258dfdcb745f55ad98dcc84d36939433f4",
    "signature": "0xdbcbb0113fbe471bfffda4e0b3adaff7e9f68b3a20260b69deac3abaf607dd3e6fc8e7c0ba64341af7b10ac3c57e5a209783c6e08ba59655887ff1b1b8a591811b",
    "signer": "0x334b140fE9d685A0b45ADF4b1666b979432E75c7",
    "userId": "550101899"
  }
}