Hans Fredrik Jacobsen
type: MusicGroup
description: thumb|Image of Hans Fredrik Jacobsen Hans Fredrik Jacobsen (born 8 September 1954) is a Norwegian musician and composer, best known for his work with his wife, the traditional folk singer Tone Hulbækm
popularity: 11
followers: 342
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9d392faec6f42dff61fde8d9ed2519b0e2caa59b21c26eea48cb8c9d87ec0328
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953707
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953707
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T23:22:21Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x9d392faec6f42dff61fde8d9ed2519b0e2caa59b21c26eea48cb8c9d87ec0328","name":"Hans Fredrik Jacobsen","registered_at":"2026-06-14T17:35:57Z","symbol":"NIM0526401","token_address":"0x58e8e5439e0975218614aeac4918437591b9c578","type":"artist","uuid":"7ce6b568-ba85-47ae-a7ff-075cf4450732"}
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 0x9d392faec6f42dff61fde8d9ed2519b0e2caa59b21c26eea48cb8c9d87ec0328. Chain 2 (Bitcoin): anchored in block 953709 (2026-06-14T23:31:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732.json and https://artists.proofprofile.net/proofs/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T23:31:11Z
  text: {"copyright_id":"0x9d392faec6f42dff61fde8d9ed2519b0e2caa59b21c26eea48cb8c9d87ec0328","name":"Hans Fredrik Jacobsen","registered_at":"2026-06-14T17:35:57Z","symbol":"NIM0526401","token_address":"0x58e8e5439e0975218614aeac4918437591b9c578","type":"artist","uuid":"7ce6b568-ba85-47ae-a7ff-075cf4450732"}
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