{
  "manageEntity": {
    "action": "Save",
    "entityId": "1887270546",
    "entityType": "Track",
    "nonce": "1792317756649369103",
    "signature": "0x4e35924f822472086a05479d4e0226097f6ab016e15ac546247631d04c96d41d2c4d9300f94fe5f8b5c47b2781c4be0aa546c158ee7a30894defcb5cefc23e481b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}