Life & fun · February 18, 2015
Stampd.io - A document blockchain stamping service
Use the public blockchains to timestamp your files with indelible proof. Create non-fungible tokens (NFT) in Cardano.
Stampd.io - A document blockchain stamping service launched on February 18, 2015 with 32 votes and more than 90% of that year's launches. The site was still online in September 2026, 11 years on.
In plain words
Stampd.io is a blockchain timestamping service that records files on public blockchains with permanent proof of existence. It allows users to mint NFTs on Cardano and tokenize physical objects using NFC tags, creating an immutable record of document issuance and history. The service is designed for anyone needing to verify the authenticity and provenance of documents or items, with the blockchain transaction ID serving as the unique identifier that cannot be altered after creation.
written from the facts on this page · September 2026
From the sources
Create (mint) an NFT and tokenize any physical object using near field communication physical tags. You will receive an NFC chip like the one on the left."> NFC tag example The cryptocurrency transaction ID is the unique identifier of your transaction on the blockchain. Timestamping and NFT creation of issued documents can allow a public verification of the issue history which is permanently recorded on the public blockchains. There is absolutely no method of potential malicious amendment at a later stage. Blockchain stamping as well as NFT minting allows a public verification of the document’s date, authenticity, origin, integrity & content without publicly exposing the content itself.…from stampd.io
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- BTbtproof - trusted timestamping on the Bitcoin blockchain2013 · btproof.com · ▲75
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