{
  "manageEntity": {
    "action": "Save",
    "entityId": "1898850169",
    "entityType": "Track",
    "nonce": "0xe789b0ba0bd7f23645513d9fa97bcbeda6ea1f5c03f54e2a9000361fc2f9f168",
    "signature": "0x2b5407796b0de0fdbc5f5922013ef19992355359f95ef99f98590f6c15313bea2d322538d9f5095c946ddbcbe4dd22a0021942528132ab7fbe2aa29bef95b22f1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}