unique and movable token that binds provenance to a particle. a neuron mints a card to claim authorship, citation, or lineage — transferable proof on the cybergraph
in the token taxonomy, the card occupies the unique-movable quadrant. unlike a coin (fungible, interchangeable), each card is a distinct object with its own identity. unlike a score (immovable), a card can be transferred between neurons, carrying its provenance history with it
every cyberlink is also a card. the seven-tuple $(\nu, p, q, \tau, a, v, t)$ — author, source particle, target particle, denomination, amount, valence, block height — is immutable once published. this record is the card's identity. transferring the card moves the economic position (conviction, yield rights) while the structural assertion remains permanently in the graph
cards are yield-bearing. a card earns in proportion to how much focus the target particle gains over time. early, correct links to important particles earn the most — the protocol rewards discovery over imitation. this yield makes cards epistemic assets: their value reflects the quality of the knowledge they encode
the movability of cards creates a secondary market for knowledge claims. a neuron who identified an important connection early can sell the card to another neuron who values the yield stream. price discovery on cards reveals what the network considers valuable knowledge
minting a card requires stake — the conviction field $(\tau, a)$ commits real tokens to the assertion. this cost ensures that card creation is a costly signal. cheap talk cannot produce cards; only committed neurons can
cards, scores, badges, and coins together form the complete token system. cards handle provenance and epistemic claims. see cyber/link for the full specification of the cyberlink-as-card
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