Generate token ownership history from EIP721 event Transfer(from, to, tokenId)

[TimDaub]

• in EPIC: Getting token holder information from neume data #321 @djfnd and @vaughnmck outline the necessity to understand a token's ownership history
• with call-block-log-extraction we already download the entire ownership history of music NFTs and then we filter it down with call-block-logs-transformation into mint events
• we do this by identifying events where from=address(0):

  strategies/src/strategies/call-block-logs/transformer.mjs

  Line 46 in 54631d9

  log.topics[1] === emptyB32 &&

• however, did we have a guarantee that call-block-logs-transformation is sorted (which for now btw we don't have) then we could construct an ownership history given the parameters of event Transfer(from, to, tokenId) by tracking the tokenId and from to to a token was transferred over time

[Kunkka0822]

Regarding this issue, we maybe need one more strategy to generate fully detailed token ownership history.

Anyway, at first, we should filter all transfer events, not only mint events and also can arrange or group events by token address or platform name and token Id in call-block-logs-transformation.

[TimDaub]

Regarding this issue, we maybe need one more strategy to generate fully detailed token ownership history.

sound good

Anyway, at first, we should filter all transfer events, not only mint events and also can arrange or group events by token address or platform name and token Id in call-block-logs-transformation.

sounds good.
btw. I'm also editing code on call-block-logs-transformation right now, but I'll probably rename mine later: https://github.com/neume-network/strategies/pull/349/files#diff-96184468d38721d52ae7b56b25d16dae851808696e4593d40e2dd1f9d4f3011e