/wallet/proposalapprove

SR votes on a proposal (approve / withdraw approval).

• Source: framework/src/main/java/org/tron/core/services/http/ProposalApproveServlet.java
• Method: POST
• Contract: protocol.ProposalApproveContract

Request parameters

Field	Type	Required	Description
owner_address	string	Yes	SR address
proposal_id	int64	Yes	Proposal ID
is_add_approval	bool	Yes	true = approve, false = withdraw approval
permission_id	int32	No	Multi-sig permission ID
visible	bool	No	Address format

Example:

curl --request POST \
     --url https://nile.trongrid.io/wallet/proposalapprove \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "owner_address":   "419c7c7049d26108be0dcb5f78479c6ff27ba101d1",
  "proposal_id":     1,
  "is_add_approval": true
}
'

Response

The validator checks the proposal's current state before construction, so a real call must use a non-expired / non-canceled proposal ID (an entry with state=PENDING from /wallet/listproposals). The example's proposal_id=1 has long since expired on Nile; the actual Nile response is:

{"Error": "class org.tron.core.exception.ContractValidateException : Proposal[1] expired"}

When validation passes, returns an unsigned protocol.Transaction. Structure outline (txID / ref_block_* / expiration / timestamp / raw_data_hex semantics are the same as /wallet/createtransaction):

{
  "visible": false,
  "txID": "<computed from raw_data>",
  "raw_data": {
    "contract": [
      {
        "parameter": {
          "value": {
            "owner_address":   "419c7c7049d26108be0dcb5f78479c6ff27ba101d1",
            "proposal_id":     1,
            "is_add_approval": true
          },
          "type_url": "type.googleapis.com/protocol.ProposalApproveContract"
        },
        "type": "ProposalApproveContract"
      }
    ],
    "ref_block_bytes": "<latest solidified block at construction time>",
    "ref_block_hash":  "<latest solidified block at construction time>",
    "expiration":      "<timestamp + 60_000>",
    "timestamp":       "<construction moment>"
  },
  "raw_data_hex": "<protobuf encoding of raw_data>"
}

Error responses

Trigger	Response
Request body exceeds node.maxMessageSize	{"Error": "class java.lang.Exception : body size is too big, the limit is <N>"}
Request body is not valid JSON / field type mismatch	{"Error": "class com.alibaba.fastjson.JSONException : <parser info>"} or {"Error": "class org.tron.core.services.http.JsonFormat$ParseException : <decoder info>"}
Invalid owner_address	{"Error": "class org.tron.core.exception.ContractValidateException : Invalid address"}
owner account does not exist	{"Error": "... : Account[<address>] not exists"}
owner is not an SR	{"Error": "... : Witness[<address>] not exists"}
proposal_id > latest proposal number	{"Error": "... : Proposal[<id>] not exists"}
Proposal ID not in storage	{"Error": "... : Proposal[<id>] not exists"}
Proposal expired	{"Error": "... : Proposal[<id>] expired"}
Proposal canceled	{"Error": "... : Proposal[<id>] canceled"}
is_add_approval=false but no prior approval	{"Error": "... : Witness[<address>]has not approved proposal[<id>] before"}
is_add_approval=true but already approved	{"Error": "... : Witness[<address>]has approved proposal[<id>] before"}
Other exceptions	{"Error": "<exceptionClass> : <message>"}

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