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Author Topic: Sending messages with transactions  (Read 764 times)
Gareth Nelson
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May 21, 2011, 04:05:01 AM
 #1

There's a simple way to do this without taking up space in the blockchain.
Simply send the transaction ID and your message to an external server, encrypt if desired.

This could be integrated with the client rather easily, but i'm wondering how many would actually use it - thoughts?
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There are several different types of Bitcoin clients. Server-assisted clients like blockchain.info rely on centralized servers to do their network verification for them. Although the server can't steal the client's bitcoins directly, it can easily execute double-spending-style attacks against the client.
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FooDSt4mP
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May 21, 2011, 04:33:24 AM
 #2

There's a simple way to do this without taking up space in the blockchain.
Simply send the transaction ID and your message to an external server, encrypt if desired.

This could be integrated with the client rather easily, but i'm wondering how many would actually use it - thoughts?

I doubt you'd get support from the official client unless the "external server" was actually a distributed network.  Also, it should be encrypted with the public key the coins were sent to (the address).  The recipient has the matching private key to decrypt it.

As we slide down the banister of life, this is just another splinter in our ass.
Gareth Nelson
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May 21, 2011, 04:38:50 AM
 #3

I obviously wouldn't expect the official client to rely on an external server (although oddly enough it still relies on IRC) - but this does seem a sensible idea.
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May 21, 2011, 04:47:20 AM
 #4

I obviously wouldn't expect the official client to rely on an external server (although oddly enough it still relies on IRC) - but this does seem a sensible idea.

It doesn't rely on IRC... IRC just helps it bootstrap faster when it is available.  There is a list of fallback nodes (in addition to those built into the client) and -addnode.

Regarding messages: you should probably also require the message be signed by at least one private key matching one of the public keys the transaction is sent from.  Otherwise, messages could be forged.

As we slide down the banister of life, this is just another splinter in our ass.
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