{
  "manageEntity": {
    "action": "Save",
    "entityId": "457437440",
    "entityType": "Track",
    "nonce": "0xb2c49b6261a33dc2705bf94d572e9abeecb2262f1a047570a2210c36891745ef",
    "signature": "0xee22692fc7cb7fafeb8863dd2de17a449583b41fa7bb1fd5e128d7ce9a234fbb1b5416bf1376f6c3bb72738c9a26e30bc7b403d7aef0f86828a108252f96bef21c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}