curl --request GET \
  --url https://tonapi.io/v2/blockchain/libraries/{hash}

{
  "boc": "b5ee9c7201010101005f0000baff0020dd2082014c97ba218201339cbab19c71b0ed44d0d31fd70bffe304e0a4f260810200d71820d70b1fed44d0d31fd3ffd15112baf2a122f901541044f910f2a2f80001d31f3120d74a96d307d402fb00ded1a4c8cb1fcbffc9ed54"
}

{
  "error": "<string>",
  "error_code": 123
}