MC Cardz
type: MusicGroup
popularity: 3
followers: 56
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb7f7d8d7c583ce7c49b585a6ab4d2b691cd63b2afe4ef359229532061eebf076
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953949
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953949
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/21c17f6d-0c79-4595-a81e-c4d5c2b4a855.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/21c17f6d-0c79-4595-a81e-c4d5c2b4a855.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/21c17f6d-0c79-4595-a81e-c4d5c2b4a855
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T13:28:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb7f7d8d7c583ce7c49b585a6ab4d2b691cd63b2afe4ef359229532061eebf076","name":"MC Cardz","registered_at":"2026-06-16T01:16:57Z","symbol":"NIM0891738","token_address":"0x04d2f7a37638b29274d63ab06c5578c376a84427","type":"artist","uuid":"21c17f6d-0c79-4595-a81e-c4d5c2b4a855"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f7d8d7c583ce7c49b585a6ab4d2b691cd63b2afe4ef359229532061eebf076. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21c17f6d-0c79-4595-a81e-c4d5c2b4a855.json and https://artists.proofprofile.net/proofs/artist/21c17f6d-0c79-4595-a81e-c4d5c2b4a855.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T13:28:01Z
  text: {"copyright_id":"0xb7f7d8d7c583ce7c49b585a6ab4d2b691cd63b2afe4ef359229532061eebf076","name":"MC Cardz","registered_at":"2026-06-16T01:16:57Z","symbol":"NIM0891738","token_address":"0x04d2f7a37638b29274d63ab06c5578c376a84427","type":"artist","uuid":"21c17f6d-0c79-4595-a81e-c4d5c2b4a855"}