{
  "manageEntity": {
    "action": "Save",
    "entityId": "289951",
    "entityType": "Track",
    "nonce": "0x93f18e8df418cb1308c4b6b92fd2b3d3c5f0ca7c818142f8f4c9547e81990445",
    "signature": "0x311abbb6fc6fc9c89c25e5eff78764176c1d2f0955408e63268c4ce25edfa34b31ef8b4568cc24dd10647500b53acb48b328d18aaaf253ed4fe042d402d4285c1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}