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TRON API method that derives an expanded spending key from a spending key for shielded TRC20 transactions. The expanded spending key contains additional cryptographic material used in the shielded transaction protocol.
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Parameters

  • value — spending key as a 32‑byte (64‑hex) string, no 0x prefix.

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Response

  • ask — the authentication secret key component
  • nsk — the nullifier secret key component
  • ovk — the outgoing viewing key component

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Use case

The wallet/getexpandedspendingkey method is used for:
  • Deriving cryptographic components needed for shielded transactions
  • Generating keys required for creating shielded TRC20 transfers
  • Supporting wallet implementations of the shielded transaction protocol
  • Enabling advanced privacy features in TRON applications

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curl example

Shell
curl --request POST \
  --url 'https://tron-mainnet.core.chainstack.com/95e61622bf6a8af293978377718e3b77/wallet/getexpandedspendingkey' \
  --header 'Content-Type: application/json' \
  --data '{
    "value": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
  }'
Ensure the key is exactly 64 hexadecimal characters without a prefix. Including 0x or using the wrong length (for example, 66 hex chars) produces the error: “the length of spendingKey’s hexString should be 64”.