{
  "manageEntity": {
    "action": "Save",
    "entityId": "1657950219",
    "entityType": "Track",
    "nonce": "0x05e449efd46982b1c4cc302011bd43a9da3a8d2ad0342f772f3ed8e1246d255a",
    "signature": "0x397f9526250bbb8c04b65ea5310992b9029bd5b54d6da92d48b6b02a799c2b4e3b9a98762f171757962ba43700c4cce19ccc0018a65c9f67a83744a17ee7a1a71b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}