Cá
type: MusicGroup
genre: vietnamese hip hop
popularity: 4
followers: 99
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0df7f83959ab5fcf0d5dfeb9467e91e442304079ae4049b4186de28c2aa90eb9
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954553
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954553
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/aca5283a-99a9-4f45-a8de-d651a0df6875.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/aca5283a-99a9-4f45-a8de-d651a0df6875.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/aca5283a-99a9-4f45-a8de-d651a0df6875
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T11:51:30Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0df7f83959ab5fcf0d5dfeb9467e91e442304079ae4049b4186de28c2aa90eb9","name":"Cá","registered_at":"2026-06-20T10:11:22Z","symbol":"NIM1589402","token_address":"0xcf5267e8f152f79f419bcac3741503f11327cdd4","type":"artist","uuid":"aca5283a-99a9-4f45-a8de-d651a0df6875"}
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 0x0df7f83959ab5fcf0d5dfeb9467e91e442304079ae4049b4186de28c2aa90eb9. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aca5283a-99a9-4f45-a8de-d651a0df6875.json and https://artists.proofprofile.net/proofs/artist/aca5283a-99a9-4f45-a8de-d651a0df6875.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T11:51:30Z
  text: {"copyright_id":"0x0df7f83959ab5fcf0d5dfeb9467e91e442304079ae4049b4186de28c2aa90eb9","name":"Cá","registered_at":"2026-06-20T10:11:22Z","symbol":"NIM1589402","token_address":"0xcf5267e8f152f79f419bcac3741503f11327cdd4","type":"artist","uuid":"aca5283a-99a9-4f45-a8de-d651a0df6875"}
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