{
  "manageEntity": {
    "action": "Save",
    "entityId": "21733",
    "entityType": "Track",
    "nonce": "0xc4b2fcd0c366092eb655ee899b7c0fedb5f94a5447144db141d7773cf50be212",
    "signature": "0xf61a72bc74130c1484ccf694b20c0d2bf02e1331abc050a045172b639d6be5911f17f948e52e431ac3b344396085c544c45e659a97eb14b8eaee9786f154bde41b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}