{
  "manageEntity": {
    "action": "Save",
    "entityId": "350273696",
    "entityType": "Track",
    "nonce": "0xc412cdc2fe7d181e47a83482c340fee47101e76d4e89ecab74218b2afafbab5b",
    "signature": "0x6a73a7d055afecd2bcd6f9c6257be443991f1a84a25148a2c945af522937bc8e5f10da68205401087697b448321f75012a3c4b41f61dc444cc91842f9d1a3ecc1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}