When computing the diffie Hellman secret - why do you choose the x co-ordinate instead of the hash of the secret which is standard practice for stealth addresses 

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On 24 Apr 2015, at 21:27, Justus Ranvier <justus.ranvier@monetas.net> wrote:

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https://github.com/justusranvier/rfc/blob/payment_code/bips/bip-pc01.mediawiki

This link contains an RFC for a new type of Bitcoin address called a "payment code"

Payment codes are SPV-friendly alternatives to DarkWallet-style stealth addresses which provide useful features such as positively identifying senders to recipients and automatically providing for transaction refunds.

Payment codes can be publicly advertised and associated with a real-life identity without causing a loss of financial privacy.

Compared to stealth addresses, payment codes require less blockchain data storage.

Payment codes require 65 bytes of OP_RETURN data per sender-recipient pair, while stealth addresses require 40 bytes per transaction.

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