{
  "manageEntity": {
    "action": "Save",
    "entityId": "1589878521",
    "entityType": "Track",
    "nonce": "0xe82e6fd97f6989426c931bfd7e69c2d4388d1f4b5b57cf16392f273a2f995b71",
    "signature": "0xb51bfb9d891272558e31169bc49c370f083c5979a71a67f4bb8b77fa6b73305841df6e1bec73585d300006418473cee65c20b525dc65e3be6d21f0d96ee88b081c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}