Tax Attestation

On-chain record of tax collected and remitted in a transaction. Enables real-time municipal tax visibility.

protocol	MAP
prefix	1PuQa7K62MiKCtssSLKy1kh56WWU7MtUR5
app	qart
type	tax_v1

Fields

Name	Type	Required	Description
app	string	yes	Application identifier. Always "qart".
type	string	yes	Schema type tag. Always "tax_v1".
order_id	string	yes	Order identifier.
tx_id	hex	yes	Transaction ID containing the tax split output.
jurisdiction	string	yes	Tax jurisdiction identifier (e.g. "austin-tx").
tax_rate	string	yes	Tax rate as decimal string (e.g. "0.0825").
tax_sats	integer	yes	Tax amount in satoshis.
merchant_address	string	yes	BSV address of the merchant.
tax_address	string	yes	BSV address of the tax authority.
timestamp	integer	yes	Unix timestamp.

Wire format

OP_FALSE OP_RETURN
  1PuQa7K62MiKCtssSLKy1kh56WWU7MtUR5
  SET
  app              qart
  type             tax_v1
  order_id         <uuid>
  tx_id            <hex>
  jurisdiction     <string>
  tax_rate         <decimal_string>
  tax_sats         <integer>
  merchant_address <bsv_address>
  tax_address      <bsv_address>
  timestamp        <unix_ts>

Context

The tax attestation accompanies a payment transaction that includes a split output to the jurisdiction’s BSV address. The attestation is the on-chain proof that tax was collected and directed. The jurisdiction can verify by resolving the transaction and checking the output.