The best replacement for notary is signature guarantee.

The best alternatives to notary are rated as following:
★★★★★  signature guarantee
★★★★★  witness
★★★★★  notary public
★★★★  commissioner of oaths
★★  solicitor
★★  medallion
★★  apostille
★  commissioner
  certifying officer
  justice of the peace
  witness signature
  stamp

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Speaking about notary, one probably shouldn't forget about power of attorney.

Other search terms related to notary and their ratings are:
★★★★★ power of attorney
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signature
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notary
signature guarantee
witness