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When users add a new key to the Key Registry, the contract emits encoded metadata in an event. You can use this metadata to determine who requested the key. To decode key metadata, you can use Viem’s decodeAbiParameters function:
[Viem]
import { decodeAbiParameters } from 'viem';

const encodedMetadata =
  '0x' +
  '0000000000000000000000000000000000000000000000000000000000000020' +
  '00000000000000000000000000000000000000000000000000000000000023C0' +
  '00000000000000000000000002EF790DD7993A35FD847C053EDDAE940D055596' +
  '0000000000000000000000000000000000000000000000000000000000000080' +
  '00000000000000000000000000000000000000000000000000000000657C8AF5' +
  '0000000000000000000000000000000000000000000000000000000000000041' +
  'F18569F4364BB2455DB27A4E8464A83AD8555416B1AAB21FF26E8501168F471F' +
  '7EC17BB096EA4438E5BF82CE01224B2F67EF9042737B7B101C41A1A05CB469DC' +
  '1B00000000000000000000000000000000000000000000000000000000000000';

const decoded = decodeAbiParameters(
  [
    {
      components: [
        {
          name: 'requestFid',
          type: 'uint256',
        },
        {
          name: 'requestSigner',
          type: 'address',
        },
        {
          name: 'signature',
          type: 'bytes',
        },
        {
          name: 'deadline',
          type: 'uint256',
        },
      ],
      type: 'tuple',
    },
  ],
  encodedMetadata
);

console.log(decoded);
/*
[
  {
    requestFid: 9152n,
    requestSigner: '0x02ef790Dd7993A35fD847C053EDdAE940D055596',
    signature: '0xF185...69F4',
    deadline: 1702660853n
  }
]
*/
See the Signed Key Request Validator reference for more details.