{
  "manageEntity": {
    "action": "Save",
    "entityId": "1021894257",
    "entityType": "Track",
    "nonce": "0xef21b629893fbf912824799dd87d8dd5261493c697e7eb610c2dd1f5209ddca6",
    "signature": "0x633bc88ee1019757ab4a43dc586056e7e7f6227d702f56058dffd42211751c2e3cc621246042bde9117e7f256c8f93c64d70eeca1154cbd16e2e8a3b38bddf3a1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}