Performing a transaction in a transactional memory environment for performing transactional executions, the transactional memory environment including a digest-generating transaction to generate a computed digest and a digest-checking transaction to compare computed digests is provided. Included is identifying, by a computer system, a first indicator signaling a beginning instruction of a digest-generating transaction including a plurality of instructions; suppressing committing memory store data of the digest-generating transaction to memory; generating a computed digest based on the execution of at least one of the plurality of instructions; identifying a second indicator associated with the plurality of instructions signaling an ending instruction of the digest-generating transaction, the computed digest is replicable for an error-free execution of the plurality of instructions; and saving the computed digest, as a reliability digest, based on completing the digest-generating transaction and not save the first computed digest based on an abort of the digest-generating transaction.