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38. Advanced Maps with Composite Tuple Keys

Multi-index and allowance tracking.

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Maps support tuples as composite keys and values, standard for allowances (`{ owner: principal, spender: principal }`).

clarity
(define-map Allowances { owner: principal, spender: principal } uint)
(map-set Allowances { owner: tx-sender, spender: 'SP3F... } u1000)

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Check your understanding

  1. 1. Can a Clarity map key consist of multiple named tuple fields?

  2. 2. How are allowances mapped in SIP-010 standard tokens?

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