What is the Pigi envelope?

3min

The Pigi envelope allows you to upload and retrieve files to and from the Bitcoin blockchain. The files are encrypted by default and allow any user with access to the reference and encryption secret to access the original file and check its authenticity. 
Flowchart
Below the process is shown in a schematic overview.
 sequenceDiagram
    participant client
    participant mintBlue
    participant Bitcoin
    client->>+mintBlue: Upload file
    mintBlue->>mintBlue: Assemble and encrypt
    mintBlue->>Bitcoin: Broadcast to network
    Bitcoin-->>mintBlue: TX accepted
    mintBlue-->>-client: TXID, Secret
 sequenceDiagram
    participant client
    participant mintBlue
    participant Bitcoin
    client->>+mintBlue: Upload file
    mintBlue->>mintBlue: Assemble and encrypt
    mintBlue->>Bitcoin: Broadcast to network
    Bitcoin-->>mintBlue: TX accepted
    mintBlue-->>-client: TXID, Secret
﻿
Use Cases
Many use cases can be built using the Token API. 
A popular use case is distribution and storage of authenticated digital files, linked to physical documents. The digital document is often linked using a QR code, containing the reference and secret. Users can scan the QR code to fetch the digital document, or processes can be put in place to automatically recognize the reference and secret on the physical document in order to fetch an authenticated and augmented digital document from the blockchain. Recipients can easily verify that the document has not changed in the meantime.
Read more about using the Token API for NFT Invoicing here: why use NFT Invoicing?﻿ 

Updated 12 Jul 2023

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