{
  "manageEntity": {
    "action": "Save",
    "entityId": "542654",
    "entityType": "Track",
    "nonce": "0xae18ae34f343538faad907340b607c6596e5148bda34cc2e5bb26654be039de2",
    "signature": "0xcc59aee302d79bad96cd0c77c020b1cb1a294da99d68eff210b24b6d96da53e8221f60bd0ac26ad72a1f55f5800cbf9561b0e2fe78ab5b9ca70abb0e759106fe1b",
    "signer": "0x580b8ce3181CecdE24dda8DddDB6a57828990d63",
    "userId": "214104220"
  }
}