Vân Du
type: MusicGroup
popularity: 3
followers: 37
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2c67902b50ec94f6ab20a0ab58486fc6db86be4735aace82bb06987a0482460d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953930
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953930
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1e71f083-64e2-4b02-9b8f-44ecf66145b9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1e71f083-64e2-4b02-9b8f-44ecf66145b9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1e71f083-64e2-4b02-9b8f-44ecf66145b9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T10:36:13Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2c67902b50ec94f6ab20a0ab58486fc6db86be4735aace82bb06987a0482460d","name":"Vân Du","registered_at":"2026-06-16T00:09:57Z","symbol":"NIM0875745","token_address":"0x40ff3c341d1142fdf2e0bdc9886c3cd75e766c79","type":"artist","uuid":"1e71f083-64e2-4b02-9b8f-44ecf66145b9"}
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 0x2c67902b50ec94f6ab20a0ab58486fc6db86be4735aace82bb06987a0482460d. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e71f083-64e2-4b02-9b8f-44ecf66145b9.json and https://artists.proofprofile.net/proofs/artist/1e71f083-64e2-4b02-9b8f-44ecf66145b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
  text: {"copyright_id":"0x2c67902b50ec94f6ab20a0ab58486fc6db86be4735aace82bb06987a0482460d","name":"Vân Du","registered_at":"2026-06-16T00:09:57Z","symbol":"NIM0875745","token_address":"0x40ff3c341d1142fdf2e0bdc9886c3cd75e766c79","type":"artist","uuid":"1e71f083-64e2-4b02-9b8f-44ecf66145b9"}
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