POST
/
95e61622bf6a8af293978377718e3b77
/
wallet
/
isshieldedtrc20contractnotespent
wallet/isshieldedtrc20contractnotespent
curl --request POST \
  --url https://tron-mainnet.core.chainstack.com/95e61622bf6a8af293978377718e3b77/wallet/isshieldedtrc20contractnotespent \
  --header 'Content-Type: application/json' \
  --data '{
  "nullifiers": [
    "0x1446f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7"
  ],
  "shielded_TRC20_contract_address": "TGzz8gjYiYRqpfmDwnLxfgPuLVNmpCswVp",
  "block_num": 10001000
}'
{
  "spent_status": [
    {
      "nullifier": "0x1446f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7",
      "spent": false
    }
  ]
}
TRON API method that checks whether specific shielded TRC20 contract notes have been spent. This method is crucial for preventing double-spending in shielded transactions and maintaining the integrity of the privacy protocol.
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​
Parameters

  • nullifiers — array of nullifiers to check for spending status
  • shielded_TRC20_contract_address — the shielded TRC20 contract address
  • block_num — optional block number to check status at specific height

​
Response

  • spent_status — array indicating which nullifiers have been spent
  • nullifier — the nullifier that was checked
  • spent — boolean indicating if the nullifier has been used (true = spent, false = unspent)

​
Use case

The wallet/isshieldedtrc20contractnotespent method is used for:
  • Preventing double-spending attacks in shielded transactions
  • Validating that notes are available for spending before creating transactions
  • Maintaining the security and integrity of the shielded transaction system
  • Supporting wallet implementations that need to track note spending status

Body

application/json
​
nullifiers
string[]
required

Array of nullifiers to check for spending status

​
shielded_TRC20_contract_address
string
required

Shielded TRC20 contract address

Example:

"TGzz8gjYiYRqpfmDwnLxfgPuLVNmpCswVp"

​
block_num
integer

Optional block number to check status at specific height

Example:

10001000

Response

200 - application/json

Successfully checked nullifier spending status

​
spent_status
object[]

Array indicating spending status of each nullifier