Duca
type: MusicGroup
genre: minimal techno
genre: progressive trance
popularity: 2
followers: 466
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xbee6ec080e0f53929e58898e439e5d9bc38588fb1032c7fad4ad7afc25989344
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8d5c9e78-b347-402f-82f5-c5770ae3d856.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8d5c9e78-b347-402f-82f5-c5770ae3d856.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8d5c9e78-b347-402f-82f5-c5770ae3d856
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xbee6ec080e0f53929e58898e439e5d9bc38588fb1032c7fad4ad7afc25989344","name":"Duca ","registered_at":"2026-06-17T14:44:02Z","symbol":"NIM1427846","token_address":"0xa51620b063b82fc6cb8cf2c93e67722183ee2f29","type":"artist","uuid":"8d5c9e78-b347-402f-82f5-c5770ae3d856"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee6ec080e0f53929e58898e439e5d9bc38588fb1032c7fad4ad7afc25989344. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d5c9e78-b347-402f-82f5-c5770ae3d856.json and https://artists.proofprofile.net/proofs/artist/8d5c9e78-b347-402f-82f5-c5770ae3d856.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0xbee6ec080e0f53929e58898e439e5d9bc38588fb1032c7fad4ad7afc25989344","name":"Duca ","registered_at":"2026-06-17T14:44:02Z","symbol":"NIM1427846","token_address":"0xa51620b063b82fc6cb8cf2c93e67722183ee2f29","type":"artist","uuid":"8d5c9e78-b347-402f-82f5-c5770ae3d856"}
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