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Paymail standardises a communication protocol that offers global user-memorable handles backed by service discovery, content negotiation, and an extension mechanism for communication between Bitcoin wallets and applications.

The Envelope Specification scope is to provide a common system for identifying the protocol used to encode data, encrypting and decrypting that data, and identifying MetaNet hierarchy and ownership of the data in an unspendable output script.

The primary purpose of this Travel Rule specification is to define a standardised protocol for VASPs on the BitcoinSV blockchain to collect and exchange the information required by the Travel Rule.

The Merkle proof is fundamental to the Simplified Payment Verifictation (SPV) verification model that underpins bitcoin scaling.

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