BIP 0020

I propose a scheme like this:

[] means optional, <> are placeholders

bitcoin:<address>?amount=<size><unit>[&label=<label>][&message=<message>]

Variables

• label: Label for that address (e.g. name of receiver)
• address: bitcoin address
• message: optional message that is shown to the user after scanning the QR code
• size: amount of $unit
• unit: BTC, [ᵗˢᵐᵇ]TBC[ᵗˢᵐᵇ], or null/omitted (which refers to the base unit)

Examples

Just the address:

bitcoin:18pnDgDYFMAKsHTA3ZqyAi6t8q9ztaWWXt

Address with name:BTC

bitcoin:18pnDgDYFMAKsHTA3ZqyAi6t8q9ztaWWXt?label=tcatm

Request to send 20.30 BTC to tcatm:

bitcoin:18pnDgDYFMAKsHTA3ZqyAi6t8q9ztaWWXt?amount=20.30BTC&label=tcatm

Request to send 400 TBC to Luke:

bitcoin:1KczVqwopWXQdFLe5sNQbpCq7yGSmXx2oo?amount=400TBC

Request to send 5 uBTC:

bitcoin:18pnDgDYFMAKsHTA3ZqyAi6t8q9ztaWWXt?amount=500

Request to send 50 BTC with message:

bitcoin:18pnDgDYFMAKsHTA3ZqyAi6t8qztaWWXt?amount=50BTC&label=tcatm&message=Payment%20for%20product%20xyz

Characters must be URI encoded properly.

BNF Syntax

bitcoinurn      = "bitcoin:" bitcoinaddress [ ";version=" bitcoinversion ] [ "?" bitcoinparams ]
bitcoinaddress  = FIXME :)
bitcoinversion  = "1.0"
bitcoinparams   = *bitcoinparam
bitcoinparam    = amountparam | labelparam | messageparam
amountparam     = "amount=" digits bitcoinunit
bitcoinunit     = btcunits | tbcunitsunicode | tbcunitsascii | tbcunitsfull
btcunits        = "BTC" | "BTCents" | "uBTC" | "uBTCents"
tbcunitsunicode = "ᵇTBC" | "ᵐTBC" | "ˢTBC" | "ᵗTBC" | "TBC" | "TBCᵗ" | "TBCˢ" | "TBCᵐ" | "TBCᵇ"
tbcunitsascii   = "bTBC" | "mTBC" | "sTBC" | "tTBC" | "TBC" | "TBCt" | "TBCs" | "TBCm" | "TBCb"
tbcunitsfull    = "tran-TBC" | "song-TBC" | "tam-TBC" | "bong-TBC" | "mill-TBC" | "san-TBC" | "ton-TBC" | "TBC" | "TBC-ton" | "TBC-san" | "TBC-mill" | "TBC-bong"
labelparam      = "label=" *uchar
messageparam    = "label=" *uchar