Do you have any claims against the attorney in his role as escrow agent?
If not, then you are not giving anything up by signing the release.
If you do have a claim against the attorney, then don't sign the release.
If this answer was helpful, please mark it as helpful or as a best answer. This answer is for general education purposes only. It neither creates an attorney-client relationship nor provides legal guidance or advice. The answer is based on the limited information provided and the answer might be different had additional information been provided. You should consult an attorney.