Bitcoin Blockchain Timestamping Overview
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Concept/CompanyHostNotes about how it worksBloatAPI
Verifiable on pruned blockchain
Link
Paper or other Links
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ChainPointSelfDocuments are SHA-256 hashed and then a merkle tree is generated and added to the blockahin throut OP_RETURN.1 TX per self created merkle treenoIf user keeps transaction data, yes.https://github.com/chainpoint/chainpointhttps://tierion.com/chainpointhttps://www.youtube.com/watch?v=VkjTnDOZ7wQhttps://www.youtube.com/watch?v=tRzUVeTrxIE
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OriginstampWebA bunch of documents SHA-256 hashes is aggregated into a seed which will then be hashed into a bitcoin private key, then public key and then the address is derived. the address is then funded with 1 Satoshi to make the timestamp in the blockchain.1 TX per day for all hashes. 1 TX per document if express mode is used.yesyesOriginstamp.comhttp://www.gipp.com/wp-content/papercite-data/pdf/gipp15a.pdf
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Proof of ExistenceWebDocument's SHA-256 hash goes into OP_Return together with a special identifier.1 TX per hashyesIf user keeps transaction data, yes.http://www.proofofexistence.com/http://www.reddit.com/r/Bitcoin/comments/1et6an/proofofexistencecom_upload_a_document_and_have_it/
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BTProofWebDocument's SHA-256 hash is used as input for RIPE160 and directly turned into an address. 1 Satoshi is payed to the address.1 TX per hashnoyeshttps://www.btproof.com/http://www.reddit.com/r/Bitcoin/comments/1t38rc/its_official_im_hitched_and_bitcoin_can_prove_it/
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tangible.ioWebDocument's SHA-256 hash goes into OP_Return (maybe together with a special identifier?)1 TX per hashnoIf user keeps transaction data, yes.http://tangible.io/en/index.html
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BitcoinTimestampSelfDocument's sha-256 hash is split into 16 pieces and each piece is translated into a bitcoin amount. The 16 amounts are sent with a sendmany TX to 16 sorted addresses. 17th address as checksum. Bitcoins can be retrieved afterwards.1 TX per hash (a rather large TX as it has at least 17 outputs)noIf user keeps transaction data, yes.https://github.com/fireduck64/BitcoinTimestamp
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ChronoBitSelfDocument SHA-256 hash is used to engage in p2ppool mining bitcoin. It seems it can be verified through Merkle tree operations?none, A.F.A.I.K. The document's SHA-256 hash plus the proof can be used to get the block hash itselfnoyeshttps://github.com/goblin/chronobit
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StoneSelfUnclear, readme is missing info on working principle. Somehow the data will be stored in the blockchain.yesno?https://github.com/dasmithii/stonehttp://www.reddit.com/r/Bitcoin/comments/2ofqjc/heres_a_tool_i_made_for_publishing_to_and_reading/
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StamperyWebUnclear how it works, no info on the website.
They have subscription plans for timestamps and file hosting
?yes?stampery.cohttps://github.com/stampery
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Blockchain IdentitySelfDescribes how to register a PGP/Identity key in the blockchain. The concept also includes a way to narrow the timepoint of signature creation two ways by signing the identity after including the last block hash and timestampiong right after.
Hash of the signed message is transformed into an address.
1 TX per hashnoyeshttp://jrruethe.github.io/blog/2015/02/28/blockchain-identity/
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CryptoGraffitiyWebService to lets you create and read any kind of message in the blockchain represented by filled addresses created from the data directly. A message could be a document's hash or a cleartext message.Dynamicnoyeshttp://www.cryptograffiti.info/
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FactomCryptosystemServices which allows much more than timestamping. It seems this is envisioned for all kinds of legal contracts as well, e.g. land registration.
It features it's own crypto token to function. It seems they try to include a transaction into every Bitcoin block as anchorpoint. OP_RETURN method used for that.
1 TX per anchorpoint. Anchorpoint can be used by many simultaneously.yesIf transaction data is kept, yes.http://factom.org/https://github.com/FactomProject/FactomDocs/blob/master/Factom_Whitepaper.pdf?raw=truehttps://youtu.be/YBXNLW-YvoA
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Btc-PGPWebPGP key and greeting message are broadcast on the Bitcoin Testnet blockchain. Signed and/or encrypted messages doe into the Bitcoin Testnet blockchain. Method OP_RETURN.Several TX per message, depending on the size.noIf transaction data is kept, yes.http://www.royalforkblog.com/btc-pgp/http://www.royalforkblog.com/2015/01/13/btcpgp/
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StampdWebDocument's SHA-256 hash goes into OP_Return together with a special identifier.1 TX per hashnoIf transaction data is kept, yes.http://stampd.io
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BitproofWebNo info found on the site?yes?https://bitproof.io/
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