Sivert Høyem
type: MusicGroup
genre: norwegian pop
description: Sivert Høyem (born 22 January 1976) is a Norwegian musician, best known as the vocalist of the rock band Madrugada. After the band broke up following the death of Robert Burås in 2007, he has enjoyed
popularity: 11
followers: 17
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x45b4d61462283bcbd0e84e3a5e95425701239044c61d360be1a6b946d16bf1a7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953596
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953596
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T06:21:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x45b4d61462283bcbd0e84e3a5e95425701239044c61d360be1a6b946d16bf1a7","name":"Sivert Høyem","registered_at":"2026-06-14T05:39:22Z","symbol":"NIM0355477","token_address":"0x7e956fcc2927fb6dc17672d7ebbf0fca328b672d","type":"artist","uuid":"0bd9a624-7830-4d5b-8b1a-d33ff7f2700f"}
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 0x45b4d61462283bcbd0e84e3a5e95425701239044c61d360be1a6b946d16bf1a7. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f.json and https://artists.proofprofile.net/proofs/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T06:21:39Z
  text: {"copyright_id":"0x45b4d61462283bcbd0e84e3a5e95425701239044c61d360be1a6b946d16bf1a7","name":"Sivert Høyem","registered_at":"2026-06-14T05:39:22Z","symbol":"NIM0355477","token_address":"0x7e956fcc2927fb6dc17672d7ebbf0fca328b672d","type":"artist","uuid":"0bd9a624-7830-4d5b-8b1a-d33ff7f2700f"}