{
  "manageEntity": {
    "action": "Save",
    "entityId": "1669614898",
    "entityType": "Track",
    "nonce": "0xa56b90d930f76fa87fe66f8aa9449b2029b51e79bd399530fbfbc49669de1803",
    "signature": "0xd4e491035b449940c2969775dc95c0c891cfb93027f70a44152ba1e7428db27c6d54b64bdf30b9940bda71e2bac43655d81dd31cd328cc70d933ea24849fd76e1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}