Thank you for bringing this important warning to the community's attention.
Indeed, there are many scammers impersonating accounts of people involved in business or offering escrow and similar services. The rule is that you don't add or contact anyone first. This is a good practice. those who truly want to reach you will initiate contact through your official accounts, or forum messages.
When it comes to financial transactions, every member must exercise caution and verify the letter of guarantee, just as the OP advised.
I have successfully verified your signed message and certified your key.
Below is my signed message in return:
PGP Fingerprint: 33E25A834E1414A15FEF0B6576C96283D5DECD53
-----BEGIN PGP MESSAGE-----
hF4D7WpqLMeUvH4SAQdAHwnwPTU8cm5eq5Snv708oOBiwEMJ2BK0+yrOp7++KB0w
cv2khy036chuUnLm+0149Gw1ppuTMt6GVMNGJwTzgr+hWnXdXiNGBZeu4DJjRGCQ
1MBiAQkCEC/P6vzvuxfHR1c9I2gmH/T9MJoy74dBQdMbKYDBHCKVqwRv2NJFSLP1
dd3b4Ypu69Q01mivwcDQWaBI/HX0tcpyv9qdD4HBJmhELlOk+s1yVrsT6uFk3GM0
LLi0NeAY44bWHAvWrTFcwEPYZVLqMt8SDVDUm3ZBAFl0aAoetEyaipNdeGAsS7RN
eKI4aOaObSYvNV5poGTvC7CraHO6LDPdwyEw4TnKc2v9b5ElXehOOFWDRWKcaUlh
IS7xRwDhxpsheS6F1z7WOoST2JSC95gXiZDIRMapJIIl0ZD5ExwN6IkTbvWGuKiU
8S5CkXzUZB541T2CMpAS5fpCrjqm5i9U09G5IvpfVoI7VTKZmo6SCqI6a42ySXTp
s852O6g=
=mtKE
-----END PGP MESSAGE-----
Thank you @albon for your message.
For the signed message, is it encrypted with the right public key (my public key).