{
  "manageEntity": {
    "action": "Save",
    "entityId": "1148274470",
    "entityType": "Track",
    "nonce": "0xfc3db24491bdb52529be32ba034f0fb815d7cfa0839b0132cdcb55a7eb6f1990",
    "signature": "0xd74a93b796704c46f39fe0403dcc5ef6feecae358ac99f84203678196e847b717a23e4219c79ff0d406f2edec6bf7f86b374e29567d66ac6819a6364024c4ee01b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}