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There is such a transaction in the Solana blockchain: 5Tkjtr2SnhaTbchug5TzeBZj6eehjdnDCLm9z6Hb3xFAcVtM6rAv2Ecxtvi6N8RbnfkRuRKR7aJv61RRNSPRxW77

There are instructions in it:
('Instruction Details' => 'View more details' => '#4 - Token Program: TransferChecked')

I can't figure out how to decode the value of the data field of this instruction to determine the transfer amount.

I am using NodeJs and the @solana/web3.js library to get transaction details.

Here is my code:

const BN = require("bn.js");

...

const transaction = await connection.getTransaction('5Tkjtr2SnhaTbchug5TzeBZj6eehjdnDCLm9z6Hb3xFAcVtM6rAv2Ecxtvi6N8RbnfkRuRKR7aJv61RRNSPRxW77', {
    commitment: "confirmed",
    maxSupportedTransactionVersion: 0,
    encoding: "json"
});

const buffer = Buffer.from(message.instructions[3].data, "base64");
const instructionId = buffer.readUInt8(0);
const amount = new BN(buffer.slice(1, 9), "le").toString();
const decimals = buffer.readUInt8(9);

But it doesn't work:

  1. According to the documentation and examples I found, instructionId should be 12, but I get 130.
  2. The value of the amount variable also doesn't look like what I need. I received value: 8508362885362758644 but it has to be 5 USDT.

The data field value itself seems to be very short to contain all the information needed for this instruction: gvQzKgr3xhN2h

Maybe I'm trying to decode the wrong field or I found incorrect information on how to do it. I would be very grateful for any hint, because I'm at a dead end.

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