{
  "manageEntity": {
    "action": "Save",
    "entityId": "502992975",
    "entityType": "Track",
    "nonce": "0x6f2d467ba7bfc35baf0f8d99f3dc74c0dfd5db4930daf5c9fdb73fdf94691b97",
    "signature": "0x36a0a66d52656c0bdc732d006a127b7c8f443c39aaec376a18b5eb42df1f7f0b496a730ad2c9deb420accd74c39b6fc6be2873bb877fef4e1e3dfdd393a213b81c",
    "signer": "0xb2F02534d11E6A4fCA3BCBe6Bd6Ad1aA049462Ca",
    "userId": "818521868"
  }
}