Douwe Kamminga
type: MusicGroup
popularity: 19
followers: 294
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc10a31d021e351a56751a57173d6c53e5ce0d41e281828fae3e51dd71f15e35a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953750
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953750
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/aaae2ced-5d8e-4b8b-bd55-47e140d07cdc.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/aaae2ced-5d8e-4b8b-bd55-47e140d07cdc.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/aaae2ced-5d8e-4b8b-bd55-47e140d07cdc
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T06:12:23Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc10a31d021e351a56751a57173d6c53e5ce0d41e281828fae3e51dd71f15e35a","name":"Douwe Kamminga","registered_at":"2026-06-14T22:29:03Z","symbol":"NIM0596269","token_address":"0x20d5a70fe1bcc496763740844e4ff28bfd92027c","type":"artist","uuid":"aaae2ced-5d8e-4b8b-bd55-47e140d07cdc"}
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 0xc10a31d021e351a56751a57173d6c53e5ce0d41e281828fae3e51dd71f15e35a. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aaae2ced-5d8e-4b8b-bd55-47e140d07cdc.json and https://artists.proofprofile.net/proofs/artist/aaae2ced-5d8e-4b8b-bd55-47e140d07cdc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T06:12:23Z
  text: {"copyright_id":"0xc10a31d021e351a56751a57173d6c53e5ce0d41e281828fae3e51dd71f15e35a","name":"Douwe Kamminga","registered_at":"2026-06-14T22:29:03Z","symbol":"NIM0596269","token_address":"0x20d5a70fe1bcc496763740844e4ff28bfd92027c","type":"artist","uuid":"aaae2ced-5d8e-4b8b-bd55-47e140d07cdc"}
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  type: MusicAlbum
  date published: 2011-06-01
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