A method for verification of product authenticity, wherein - a first DNA strand, preferably in a concentration range of from 1 fmol.L -1 to 1 μmol.L -1 , said first DNA strand containing a first molecule active in Surface-Enhanced Raman Scattering, selected from the group consisting of Cy3, Cy5, Cy7, biotin, ROX, rhodamine 6G, HEX, FAM, TET, TAMRA, bound in a region of at least one of the ends of the DNA strand, is added into the product during its production or subsequently, - for verification of product authenticity, a second DNA strand is added into the product, said second DNA strand containing a functional group containing sulphur or nitrogen atom in the region of the first end of the DNA strand, and said second DNA strand containing a second molecule active in Surface-Enhanced Raman Scattering, selected from the group consisting of Cy3, Cy5, Cy7, biotin, ROX, rhodamine 6G, HEX, FAM, TET, TAMRA, in the region of the second end of the second DNA strand, and wherein the second DNA strand is bound to a noble metal nanoparticle surface via the functional group containing sulphur or nitrogen atom, and wherein the second molecule active in Surface-Enhanced Raman Scattering is different from the first molecule active in Surface-Enhanced Raman Scattering, and wherein the first DNA strand and the second DNA strand are mutually complementary in at least one part of their length, and wherein the first and the second molecule active in Surface-Enhanced Raman Scattering are bound either both to the 5'-ends, or both to the 3'-ends of the first and the second DNA strands, and wherein the term "in a region of one end" means that the corresponding molecule and/or a functional group is bound to one of the last 5 nucleotides of the corresponding end of the DNA strand, - subsequently, the hybridization product formed by interaction of the first and the second DNA strand is isolated, - spectrum of the isolated hybridization product is measured using Surface-Enhanced Raman Scattering method. - a first DNA strand, preferably in a concentration range of from 1 fmol.L -1 to 1 μmol.L -1 , said first DNA strand containing a first molecule active in Surface-Enhanced Raman Scattering, selected from the group consisting of Cy3, Cy5, Cy7, biotin, ROX, rhodamine 6G, HEX, FAM, TET, TAMRA, bound in a region of at least one of the ends of the DNA strand, is added into the product during its production or subsequently, - for verification of product authenticity, a second DNA strand is added into the product, said second DNA strand containing a functional group containing sulphur or nitrogen atom in the region of the first end of the DNA strand, and said second DNA strand containing a second molecule active in Surface-Enhanced Raman Scattering, selected from the group consisting of Cy3, Cy5, Cy7, biotin, ROX, rhodamine 6G, HEX, FAM, TET, TAMRA, in the region of the second end of the second DNA strand, and wherein the second DNA strand is bound to a noble metal nanoparticle surface via the functional group containing sulphur or nitrogen atom, - subsequently, the hybridization product formed by interaction of the first and the second DNA strand is isolated, - spectrum of the isolated hybridization product is measured using Surface-Enhanced Raman Scattering method. <EOS>