{
  "manageEntity": {
    "action": "Save",
    "entityId": "746095727",
    "entityType": "Track",
    "nonce": "0x0e1c72311a72202fd1af12e91d5b67439186bfd5019a3285b04541928bb1f11a",
    "signature": "0xd0bb8591683392d08a81f20886537555674843ccaecaf9445a148129f544e9600bb5d1694de5d58652a744df2d65371ae3e9468eb1ed22fe3b35e348f447bc7e1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}