pockets – Attempting to recuperate outdated BTC from a pre-2013 centralized change — I’ve my electronic mail, a 5-digit code and an MD5-like hash, however do not bear in mind the platfor

Again round 2012–2013, I bought some Bitcoin on what I imagine was a centralized change. I by no means touched them since, and I am now making an attempt to recuperate entry.

This is what I nonetheless have:

• My outdated electronic mail handle used to register
• A 5-digit code (probably a PIN or account identifier)
• A 32-character string that appears like an MD5 hash or related cryptographic fingerprint — it is too quick to be a personal key, and comprises non-hex characters, which suggests it could be a platform-specific token or session ID somewhat than a normal hash

I do NOT have:

• The identify of the platform (I genuinely cannot bear in mind)
• A seed phrase or non-public key
• A pockets.dat file (so far as I do know)

My questions:

1. May this MD5-like string assist establish which platform I used?
2. Is there a strategy to hint again which change was related to my outdated electronic mail, primarily based on the kind of identifiers they used on the time?
3. What have been the commonest centralized exchanges earlier than 2013 that I ought to attempt first (Mt. Gox, Blockchain.information, Coinbase, BTC-e…)?

Any steerage could be drastically appreciated. Thanks!