To verify any block from the exhibition for sale series, decrypt the relevant signature with this RSA key and compare against the SHA-256 hash of the block's 3D file.
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC53YRGYDX4rVJjrccIjd8K9aEV4Pmo3s3uIo5EQInMy0ghWZ2KR0YWMxz3LjRFuzyIfBn4pBH4h0aY3a83Cc2nMnV1+5Q/PHV8QizYTZ59xnT2kDb8zjHX3EUt8Qw14gEuTqASP+QJScjXYZxQllOCOzX7r1hB6+WPtbxzjPC6rQIDAQAB
-----END PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC53YRGYDX4rVJjrccIjd8K9aEV4Pmo3s3uIo5EQInMy0ghWZ2KR0YWMxz3LjRFuzyIfBn4pBH4h0aY3a83Cc2nMnV1+5Q/PHV8QizYTZ59xnT2kDb8zjHX3EUt8Qw14gEuTqASP+QJScjXYZxQllOCOzX7r1hB6+WPtbxzjPC6rQIDAQAB
-----END PUBLIC KEY-----