Akashi Notari

Prove any file existed. On-chain timestamp. In 60 seconds.

What it does

Akashi Notari: The simplest way to timestamp any file on blockchain. Generate a private, on-chain proof of existence in 1 min and under $1. No uploads, just a hash. Get an instant PDF certificate. Supports Base, ETH, & OP.

Does a similar job

all alternatives →

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TimeSeal2023 · ▲116
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BT
btproof - trusted timestamping on the Bitcoin blockchain2013 · btproof.com · ▲75
yousaidthat.orgJun 2026 · yousaidthat.org · ▲63
Prove that you said things before anyone else
TimeProofJan 2026 · ▲5
Prove it existed. Permanently.

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