{
  "manageEntity": {
    "action": "Save",
    "entityId": "202863",
    "entityType": "Track",
    "nonce": "0x8a9294277192ce8ed5eab3998d638777cb636a68da40d5a91a93938894870d76",
    "signature": "0xd21a0d9f0859bc23c911d5e9d858c0f11b5a2884124dbb6718c41135207496bf3bcb084a46d1977796556fb22bf35ae4b8788106038c35811c5dbfcbcd5626b51c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}