Ledger LandISSUE #67 of 90

did · decentralized identifiers

BlockyVSDouble-Spend Dan

Blocky saysDIDs are decentralized identifiers — self-owned identity not issued by any platform.

A Decentralized Identifier is an identity you control via keys, not granted by Google or a government. Paired with verifiable credentials (cryptographically signed claims you hold and present selectively), DIDs enable "prove you're over 18 without revealing your birthday." It's an emerging standard for portable, privacy-preserving, user-owned identity across the web.

Power-ups you unlock

Self-owned identifier, controlled by keys
Verifiable credentials = signed, selective claims
Prove facts without oversharing
Emerging standard for portable identity

Double-Spend Dan attacks — common mistakes

Confusing a DID with a wallet address
Assuming wide adoption today (still emerging)
Overlooking key-loss = identity-loss risk

Boss battleExplain how a verifiable credential proves age without revealing a birthdate.

Example code

<!doctype html><html><head><meta charset="utf-8"></head>
<body style="background:#06040d;color:#e6e0ff;font-family:monospace;padding:20px"><pre>issuer signs: "this DID is over 18"
you present just that claim (not your DOB)
verifier checks the signature → trusts it</pre></body></html>

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