thank you very much; we sincerely thank you
A polite, formal expression of gratitude. 誠に adds a sincere or official tone, so it is common in business, announcements, speeches, and service settings rather than casual thanks among close friends.
Thank you very much for coming today.
Thank you very much for your cooperation.
ありがとうございます is the basic polite 'thank you', while 誠にありがとうございます adds 誠に for a more formal, emphatic tone used in business and service settings.
どうもありがとうございます also means 'thank you very much' but sounds more conversational than 誠にありがとうございます, which is used in formal or official contexts.
Standard polite written form; common in formal speech, notices, email, and customer-facing messages.
Kanji spelling 有難う is understandable and attested, but the kana ありがとう in the standard form is more usual in modern writing.
Very kanji-heavy spelling; may appear in highly formal or old-fashioned writing, but it is not the normal modern choice.
Mixed spelling with 御座います; attested but uncommon compared with 誠にありがとうございます.
A fixed polite phrase combining 誠に, 'truly; sincerely,' with ありがとうございます, 'thank you.' The spelling 有難う reflects the connection with ありがたい, but the modern phrase is normally written with ありがとう in kana.