Nucleic acid sequencing adapters and uses thereof

A method of identifying an error in a nucleic acid sequence, comprising:

• sequencing a set of amplified first strands formed from a first strand of a duplex nucleic acid molecule, resulting in a set of first strand reads;
• sequencing a set of amplified second strands formed from a second strand of the duplex nucleic acid molecule, resulting in a set of second strand reads;
• constructing a first strand consensus sequence using the set of first strand reads;
• constructing a second strand consensus sequence using the set of second strand reads;
• and comparing the first strand consensus sequence to the second strand consensus sequence;
• wherein the duplex nucleic acid molecule is ligated to a sequencing adapter prior to being amplified;
• and the sequencing adapter is randomly selected from a plurality of sequencing adapters comprising:
• a first sequencing adapter comprising a first duplex molecular barcode n nucleotides in length;
• and
• a second sequencing adapter comprising a second duplex molecular barcode n+x nucleotides in length, wherein x is not zero.