{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557085700",
    "entityType": "Track",
    "nonce": "0xe7cd06df41761aa8b7c70cd099280e7d9a164e5e73806a49da757ca25a681364",
    "signature": "0x9bfc48de56fbccba7e43cedbd38bb1afc1106b99c204053bc78d64b49d58aee9387b51519c8d7bc5e42eae71f10f7118defe624e511edaea8a3ad5584ac769541b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}