Marketplace offer structure and description

Offer's JSON structure and fields description¶

Here is a typical offer, that can be pushed to the EvoX blockchain-based marketplace.
The structure of the offer is quite flexible, it's defined in JSON text format with this very shorten names of the fields, and kept gzipped inside transaction attachment, to safe space.
Offers not stay forever in blockchain, since it would be a waste of space, after transactions, which carry offers, will pass the checkpoints, it will be pruned, same way as signatures get pruned from tx.

JSON¶

od: {
      "ap": "20",
      "at": "1",
      "cat": "CLS:MAN:TSH",
      "cnt": "Skype: some_skype, discord: some_user#01012",
      "com": "A comment about tshirt",
      "do": "Additional conditions",
      "et": 10,
      "fee": 10000000000,
      "lci": "",
      "lco": "World Wide",
      "ot": 1,
      "pt": "Credit cards, BTC, EVOX, ETH",
      "t": "T-shirt with Evox logo"
        }

Fields description:¶

ot - Offer type

    0 - buy currency for EvoX, 
    1 - buy EvoX for currency, 
    2 - buy goods for EvoX, 
    3 - sell goods for EvoX

ap - the amount of the currency specified for use in this offer
at - the amount of the items to be sold/bought
cat - Category of the goods, could be specified with subcategories by separation CLS:MAN:TSH, which could mean Clothes->Man->Tshirts
cnt - Contacts, like skype, discord, telegram, whatever
com - Comments regarding this offer
do - Additional conditions, if need to specify
et - Expiration time, set in days, eg 5 - expire in 5 days after creation
fee - Fee paid for this transaction with the offer, it can be default offer, but the higher fee may bring offers to be higher in search results
lco - Location country, if this makes sense for an offer
lci - Location city, if the also make sense for an offer, could be google geo-autocomplete id, like ChIJD7fiBh9u5kcRYJSMaMOCCwQ
pt - Payment type, Credit cards, Crypto, Paypal, Flexa
t - Description for the goods/service which is selling/seeking