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backus's profile
John Backus
John Backus
John Backus
@backus

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John Backus

@backus

Seeking alternative compression. Hopefully wrong on average. Shameless. Started @getcognito and @bloom

San Francisco, CA
Joined August 2012

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    1. John Backus‏ @backus Apr 4

      Ethereum dApps will probably move to users signing blobs of data using private keys that don't actually hold any funds. dApp operators will submit txs including these signatures, proving the end user gave the 👍. Lets business pay for gas, deal with nonces, retry TXs, etc.

      17 replies 60 retweets 226 likes
      Show this thread
      John Backus‏ @backus Apr 4

      Attached screenshot is a concrete example for those that know a little bit of solidity. Basically, why does a user of a social network need to submit a TX saying they accept a friend request? Just use the private key to prove you accept and let the biz submit the TX for you.pic.twitter.com/8E9UGJc3I5

      12:02 PM - 4 Apr 2018
      • 10 Retweets
      • 55 Likes
      • Nā·thən Wī·nənt Wespr Richard Burton saif🎃 Zvi Token Curated Registries M. Riccobene Yaniv Tal Ronan Sandford
      12 replies 10 retweets 55 likes
        1. New conversation
        2. Nate Rush‏ @naterush1997 Apr 4
          Replying to @backus

          Schemes like this are hard to reason about. If failed tx reverts, signed data can be replayed (can be very dangerous in some cases). If nonce included and tx not totally reverted, front-running attacks possible (unless tx sender included in signature).

          2 replies 0 retweets 0 likes
        3. John Backus‏ @backus Apr 4
          Replying to @naterush1997

          Example I proposed was simpler than I think you're assuming. Not just anyone can submit a transaction containing a user signature. Basically, administrators of the smart contract in question can do it no one else

          1 reply 0 retweets 1 like
        4. Nate Rush‏ @naterush1997 Apr 4
          Replying to @backus

          Sure, but see tweet below. If users can unfriend people, they have to trust that the owner will not replay signed data. Obviously, this isn't a huge deal in this case - just an example of how these schemes are hard to reason about.

          2 replies 0 retweets 0 likes
        5. John Backus‏ @backus Apr 4
          Replying to @naterush1997

          It is more complicated but I don't think it is hard to reason about in a way that implies "don't do it." Are there cases where even the onlyOwner example is very security critical? Yeah probably. I'm just talking about general design patterns that I expect to shift though

          0 replies 0 retweets 0 likes
        6. End of conversation
        1. New conversation
        2. Dan Finlay‏ @danfinlay Apr 4
          Replying to @backus

          Long term this can also be solved at the user-identity-account/proxy-contract layer, reducing the number of "_onBehalfOf" methods that you need to publish.

          1 reply 1 retweet 3 likes
        3. Alex Badalyan‏ @alexbadalyan Apr 4
          Replying to @danfinlay @backus

          Any examples?

          1 reply 0 retweets 1 like
        4. Dan Finlay‏ @danfinlay Apr 4
          Replying to @alexbadalyan @backus

          The Gnosis Multisig v2

          0 replies 0 retweets 2 likes
        5. End of conversation
        1. more alien‏ @maurelian_ Apr 4
          Replying to @backus

          Yiss, and @uport_me has an audited, generalized impl of this! https://github.com/uport-project/uport-identity/blob/develop/docs/txRelay.md …pic.twitter.com/YRR9mWGM6q

          0 replies 0 retweets 8 likes
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        1. New conversation
        2. grahammcbain‏ @grahammcbain Apr 4
          Replying to @backus

          This + allowing users to sign tx directly should they choose is probably a great transitional step. Some users will always want full control while most just want good UX. Very interesting approach! Whatcha think @Kevinlivin ?

          1 reply 0 retweets 1 like
        3. Kevin Weiler‏ @Kevinlivin Apr 4
          Replying to @grahammcbain @backus

          Good ?, I'd allow user to authorize an "operator" contract to do state changes on behalf of a user. Similar to how #ERC721 uses setApprovalForAll to approve an "operator" contract that can transfer a user's tokens and avoids the user having to do txs each step of the way

          0 replies 0 retweets 1 like
        4. End of conversation
        1. Moe  🇨🇦‏ @moeadham Apr 5
          Replying to @backus

          @metamask_io didn't get the memo. https://github.com/MetaMask/metamask-extension/issues/3475 … cc @aerinonfire

          0 replies 0 retweets 1 like
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        1. | Postis Alpha | CookieBAF  🍪 | XRP ⚡ |‏ @The_Mainlander Apr 5
          Replying to @backus

          Trust enabler?! can this work for advertising ... show me ads for stuff I like ...

          0 replies 0 retweets 0 likes
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        1. Le Quoc Viet‏ @vietlq Apr 5
          Replying to @backus

          This can be done via relaying/proxying or bundling. There’s solution for that - Proof of Existense and @opentimestamps by @peterktodd

          0 replies 0 retweets 0 likes
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        1. Stefano 👾‏ @StefanoZorzi Apr 5
          Replying to @backus

          What about dealing with this through a channel?

          0 replies 0 retweets 0 likes
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        1. Moises C.  🚀  🚀  🚀‏ @cryptonaut1337 Apr 4
          Replying to @backus

          This is the ETH equivalent of batching transaction

          0 replies 0 retweets 0 likes
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        1. Erik‏ @eaj Apr 4
          Replying to @backus

          Agree with it - at least as an alternative.

          0 replies 0 retweets 0 likes
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        1. JARRAÐ HOPΞ 侯家睿‏ @jarradhope Apr 4
          Replying to @backus

          storage isn't free and is highly subsidized in Blockchains already

          0 replies 0 retweets 0 likes
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        1. Maya Zehavi‏ @mayazi Apr 4
          Replying to @backus

          Wondering if u just described how an ethereum lightning-protocol would debit business for computation and transaction fees of their clients...

          0 replies 0 retweets 0 likes
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