Janco de Leeuw
type: MusicGroup
popularity: 4
followers: 105
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5496491834b6ce4165d42a0298ce59e7fa9b7fba0a26baefc617208598534ce2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/948e846c-14f1-4be8-811f-fa67979fa2f9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/948e846c-14f1-4be8-811f-fa67979fa2f9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/948e846c-14f1-4be8-811f-fa67979fa2f9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x5496491834b6ce4165d42a0298ce59e7fa9b7fba0a26baefc617208598534ce2","name":"Janco de Leeuw","registered_at":"2026-06-17T17:50:58Z","symbol":"NIM1472496","token_address":"0x0612b3e65050460b0d98539f0b2a0ea16d8eaf75","type":"artist","uuid":"948e846c-14f1-4be8-811f-fa67979fa2f9"}
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 0x5496491834b6ce4165d42a0298ce59e7fa9b7fba0a26baefc617208598534ce2. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/948e846c-14f1-4be8-811f-fa67979fa2f9.json and https://artists.proofprofile.net/proofs/artist/948e846c-14f1-4be8-811f-fa67979fa2f9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0x5496491834b6ce4165d42a0298ce59e7fa9b7fba0a26baefc617208598534ce2","name":"Janco de Leeuw","registered_at":"2026-06-17T17:50:58Z","symbol":"NIM1472496","token_address":"0x0612b3e65050460b0d98539f0b2a0ea16d8eaf75","type":"artist","uuid":"948e846c-14f1-4be8-811f-fa67979fa2f9"}
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