Harm en Roelof
type: MusicGroup
popularity: 9
followers: 175
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf57700aeb60cb04f86bb88dc8b4b71e7dce037f7fa4c49eadab8a48e8c222879
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/db1f0232-b950-42c4-a796-4e66f6f19ce6.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/db1f0232-b950-42c4-a796-4e66f6f19ce6.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/db1f0232-b950-42c4-a796-4e66f6f19ce6
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf57700aeb60cb04f86bb88dc8b4b71e7dce037f7fa4c49eadab8a48e8c222879","name":"Harm en Roelof","registered_at":"2026-06-21T04:33:13Z","symbol":"NIM1820821","token_address":"0xaa3198265cdfd9c96d292f45bce79c8919733e79","type":"artist","uuid":"db1f0232-b950-42c4-a796-4e66f6f19ce6"}
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 0xf57700aeb60cb04f86bb88dc8b4b71e7dce037f7fa4c49eadab8a48e8c222879. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db1f0232-b950-42c4-a796-4e66f6f19ce6.json and https://artists.proofprofile.net/proofs/artist/db1f0232-b950-42c4-a796-4e66f6f19ce6.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xf57700aeb60cb04f86bb88dc8b4b71e7dce037f7fa4c49eadab8a48e8c222879","name":"Harm en Roelof","registered_at":"2026-06-21T04:33:13Z","symbol":"NIM1820821","token_address":"0xaa3198265cdfd9c96d292f45bce79c8919733e79","type":"artist","uuid":"db1f0232-b950-42c4-a796-4e66f6f19ce6"}
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