{
  "manageEntity": {
    "action": "Save",
    "entityId": "655768",
    "entityType": "Track",
    "nonce": "0x6e5a892ea8de57a05396c3b58357b1b783ca545e33ffab357347e3941552c4f7",
    "signature": "0xb9d38199968186969385a81261b92e044f4228d2db70e7755b777e7aceaf14b74a22292bdada7c8024d8a5f03a152d1d62e01554c87cca904750040a2b9031191b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}