Hi Matt,

I used Shamir's Secret Sharing to decompose a seed for a BIP32 master key, that is I think more future relevant than a single key.
Therefore suggest to adapt the BIP for a length used there typically 16 or 32 bytes and have a magic code to indicate its use as key vs. seed.

Regards,

Tamas Blummer
http://bitsofproof.com

On 29.03.2014, at 09:05, Matt Whitlock <bip@mattwhitlock.name> wrote:

> Abstract: A method is described for dividing a Bitcoin private key into shares in a manner such that the key can be reconstituted from any sufficiently large subset of the shares but such that individually the shares do not reveal any information about the key. This method is commonly known as Shamir's Secret Sharing Scheme. Additionally, an encoding methodology is proposed to standardize transmission and storage of shares.
> 
> Complete BIP: https://github.com/whitslack/btctool/blob/bip/bip-xxxx.mediawiki
> 
> I am looking to have this BIP assigned a number and added to the bitcoin/bips repository. I invite any comments, questions, or suggestions.
> 
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