Event signature · Stablecoins and issued tokens

RemovedBlackList (USDT) event signature and topic0

The topic0 of the RemovedBlackList (USDT) event is 0xd7e9ec6e6ecd65492dce6bf513cd6867560d49544421d0783ddf06e76c24470c, the keccak-256 hash of RemovedBlackList(address); none of its arguments are indexed. Address unfrozen by the token issuer (Tether).

Anatomy of a RemovedBlackList (USDT) log

Topics

topic00xd7e9ec6e6ecd65492dce6bf513cd6867560d49544421d0783ddf06e76c24470ckeccak256("RemovedBlackList(address)")

Data

data_user (address)ABI-encoded, decoded with the ABI

Parameters

Arguments and where they sit in the log

Indexed arguments travel as topics and can be filtered cheaply; the others are ABI-encoded together in the data.

Name	Type	In the log
_user	address	data

Solidity declaration

event RemovedBlackList(address _user);

Canonical signature

RemovedBlackList(address)

topic0

0xd7e9ec6e6ecd65492dce6bf513cd6867560d49544421d0783ddf06e76c24470c

Ready-made alerts

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Ready-made rule · Tether (USDT)USDT blacklist changes

Ready-made rule · Tether (USDT)Alert on every RemovedBlackList

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Who emits it

Contracts we list that emit RemovedBlackList

Any other contract with the same signature emits a log with the same topic0.

Tether (USDT)

0xdac17f958d2ee523a2206206994597c13d831ec7

Tracker: USDT (Tether)

Code

Read RemovedBlackList logs in code

The same filter in viem, ethers and plain JSON-RPC, and the Solidity that emits it. The address is Tether (USDT), a contract we list that emits it.

viem

import { createPublicClient, http, parseAbiItem } from "viem"
import { mainnet } from "viem/chains"

const client = createPublicClient({ chain: mainnet, transport: http() })

const logs = await client.getLogs({
  address: "0xdac17f958d2ee523a2206206994597c13d831ec7",
  event: parseAbiItem("event RemovedBlackList(address _user)"),
  fromBlock: "latest",
})

for (const log of logs) console.log(log.args) // { _user }

ethers v6

import { Interface, JsonRpcProvider } from "ethers"

const provider = new JsonRpcProvider(process.env.RPC_URL)
const iface = new Interface(["event RemovedBlackList(address _user)"])

const logs = await provider.getLogs({
  address: "0xdac17f958d2ee523a2206206994597c13d831ec7",
  topics: [iface.getEvent("RemovedBlackList")!.topicHash],
})

for (const log of logs) console.log(iface.parseLog(log)?.args)

JSON-RPC (eth_getLogs)

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getLogs",
  "params": [
    {
      "address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
      "topics": [
        "0xd7e9ec6e6ecd65492dce6bf513cd6867560d49544421d0783ddf06e76c24470c"
      ],
      "fromBlock": "latest"
    }
  ]
}

Solidity

event RemovedBlackList(address _user);

// inside a function:
emit RemovedBlackList(_user);

Example

An example RemovedBlackList log, encoded and decoded

Placeholder values, not a real transaction: how each argument is stored in the topics and the data, and what decoding gives back.

Encoded (as the node returns it)

topic0keccak256("RemovedBlackList(address)")0xd7e9ec6e6ecd65492dce6bf513cd6867560d49544421d0783ddf06e76c24470c
data0x0000000000000000000000001111111111111111111111111111111111111111

Decoded with the ABI

_useraddress0x1111111111111111111111111111111111111111

FAQ

Frequently asked questions

What is the topic0 of the RemovedBlackList (USDT) event?

0xd7e9ec6e6ecd65492dce6bf513cd6867560d49544421d0783ddf06e76c24470c: the keccak-256 hash of RemovedBlackList(address).

Which RemovedBlackList (USDT) arguments are indexed?

None: _user is ABI-encoded in the log's data, so a log can only be filtered by address and topic0.

How do I get an alert when a contract emits RemovedBlackList (USDT)?

Open one of the ready-made rules on this page, or add any contract and pick RemovedBlackList (USDT) from the event list. Conditions can be set on its arguments, and each alert names the contract and links to the transaction.

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