{
  "manageEntity": {
    "action": "Save",
    "entityId": "1880856470",
    "entityType": "Track",
    "nonce": "1786666266154964172",
    "signature": "0xee7473d6947e20134303a4730138f4bf22cef12923e7564a63d6ac22dfd9d3006637bafdbe669d9f8a95a6e8a8a33035b2e3aa958775cd417d1cc2d2b0cf4ac21b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}