{
  "manageEntity": {
    "action": "Save",
    "entityId": "445258664",
    "entityType": "Track",
    "nonce": "1792474656559656051",
    "signature": "0x59ebdde6239888e2636f52c3c89803c37f368cbe6879eb2692c387fa0bd535a356aef324bf45c248a9dfe512f737fe3d71a7421352def545aa44943abd08f1bf1b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}