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POST
/
95e61622bf6a8af293978377718e3b77
/
wallet
/
createspendauthsig
wallet/createspendauthsig
curl --request POST \
  --url https://tron-mainnet.core.chainstack.com/95e61622bf6a8af293978377718e3b77/wallet/createspendauthsig \
  --header 'Content-Type: application/json' \
  --data '
{
  "ask": "0f63eabdfe2bbfe08012f6bb2db024e6809c16e8ed055aa41a6095424f192005",
  "alpha": "d0f0768664f5c807f9e70d05993f029c71da529afaa5c037b44c63d6e13bc907",
  "tx_hash": "7fb99e66df052f430d50e80a3f197c319a4e35184ed48a433d6219e025741337"
}
'
{
  "value": "66c806bc592a7599e65833bf25c3c7005c8b21b7895dd835a84c97d7bec49d0f1493d2c73a68eeb9b9699b92cae42406f9e44ebe19acaea3d5febfe28de57109"
}
TRON API method that creates a spending authorization signature for shielded TRC20 transactions. This signature authorizes the spending of shielded notes and is a critical component of the privacy-preserving transaction protocol.
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All cryptographic parameters (ask, alpha, tx_hash) must be exactly 32 bytes (64 hexadecimal characters) provided as raw hex strings without the 0x prefix. Values that are shorter, longer, or include the 0x prefix will result in a “param length must be 32” error.

​
Parameters

  • ask — the authentication secret key used for signing (32 bytes, hex without 0x prefix)
  • alpha — the alpha parameter for randomization (32 bytes, hex without 0x prefix)
  • tx_hash — the transaction hash being authorized (32 bytes, hex without 0x prefix)

​
Response

  • value — the generated spending authorization signature (hex string without 0x prefix)

​
Use case

The wallet/createspendauthsig method is used for:
  • Authorizing the spending of shielded notes in privacy transactions
  • Creating cryptographic signatures that prove spending authority without revealing identity
  • Supporting the zero-knowledge proof system in shielded transactions
  • Enabling secure authorization of shielded TRC20 transfers

Body

application/json
​
ask
string
required

Authentication secret key for signing (32 bytes, hex without 0x prefix)

Example:

"0f63eabdfe2bbfe08012f6bb2db024e6809c16e8ed055aa41a6095424f192005"

​
alpha
string
required

Alpha parameter for randomization (32 bytes, hex without 0x prefix)

Example:

"d0f0768664f5c807f9e70d05993f029c71da529afaa5c037b44c63d6e13bc907"

​
tx_hash
string
required

Transaction hash being authorized (32 bytes, hex without 0x prefix)

Example:

"7fb99e66df052f430d50e80a3f197c319a4e35184ed48a433d6219e025741337"

Response

200 - application/json

Successfully created spending authorization signature

​
value
string

Generated spending authorization signature (hex string without 0x prefix)

Example:

"66c806bc592a7599e65833bf25c3c7005c8b21b7895dd835a84c97d7bec49d0f1493d2c73a68eeb9b9699b92cae42406f9e44ebe19acaea3d5febfe28de57109"

Last modified on November 1, 2025