{
  "manageEntity": {
    "action": "Save",
    "entityId": "600799442",
    "entityType": "Track",
    "nonce": "0xd9f6e6523861bd0826cd4bb0e9a60041bb092251ea4217e5603916e9d2a1bad4",
    "signature": "0xb28f0f494e6fc397224b475265a3242c4503cd446bf254db5383214bc627dfa630761c6dccbc83a4f8f2e109d70e69e031e331422377d96b07d46f85e84e05e71c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}