Martin Karlsson
type: MusicGroup
description: Martin Karlsson may refer to: Martin Karlsson (ice hockey, born 1952), Swedish ice hockey player and head coach Martin Karlsson (ice hockey, born 1991), Swedish ice hockey player Martin Karlsson (ic
popularity: 8
followers: 54
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xce9e34f805088fa9a59d9b1ac6087f4d0c16aaf6f6e4cc0ac9303eacc9f97f47
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954062
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954062
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/45dc5de4-c04a-4f07-9c95-8656692d171e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/45dc5de4-c04a-4f07-9c95-8656692d171e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/45dc5de4-c04a-4f07-9c95-8656692d171e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T07:39:10Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xce9e34f805088fa9a59d9b1ac6087f4d0c16aaf6f6e4cc0ac9303eacc9f97f47","name":"Martin Karlsson","registered_at":"2026-06-16T14:03:00Z","symbol":"NIM1074618","token_address":"0xd66f3d0f21299998b9520867c8755aadf5b7836e","type":"artist","uuid":"45dc5de4-c04a-4f07-9c95-8656692d171e"}
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 0xce9e34f805088fa9a59d9b1ac6087f4d0c16aaf6f6e4cc0ac9303eacc9f97f47. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45dc5de4-c04a-4f07-9c95-8656692d171e.json and https://artists.proofprofile.net/proofs/artist/45dc5de4-c04a-4f07-9c95-8656692d171e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T07:39:10Z
  text: {"copyright_id":"0xce9e34f805088fa9a59d9b1ac6087f4d0c16aaf6f6e4cc0ac9303eacc9f97f47","name":"Martin Karlsson","registered_at":"2026-06-16T14:03:00Z","symbol":"NIM1074618","token_address":"0xd66f3d0f21299998b9520867c8755aadf5b7836e","type":"artist","uuid":"45dc5de4-c04a-4f07-9c95-8656692d171e"}
album: Pelle Svanslös & Talangjakten
  type: MusicAlbum
  date published: 2009-11-11