{
  "manageEntity": {
    "action": "Save",
    "entityId": "1666469057",
    "entityType": "Track",
    "nonce": "0x8b2d5d24bec13ea28d5058253989e570c69f914bfd54af8d2f817d3460876764",
    "signature": "0xc9b3e8e435169cab139571ce5ec30e8c685106357c7abf40925c0e1aa997afa33214095feb11fd9b2c701afdef79a9ac8c874418e37579560af9d924dae76a9b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}