{
  "manageEntity": {
    "action": "Save",
    "entityId": "310449",
    "entityType": "Track",
    "nonce": "0x12b62f9caf1a7c332a08158bb5fdadb6f1c8ad4c48348034ff9267d6dbe43799",
    "signature": "0xb676dd53687310d34197f0c0c14737bf217f332effa678d07ee4bc8fa9e676aa6c4a0302f43c449c0d946581d88fccc18760205997ef8c113b40c22bcf65e9cf1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}