Oscar Jacobsson
type: MusicGroup
description: thumb|Oscar Jacobsson Oscar Jacobsson (Gothenburg, 1889 – Solberga, December 25, 1945) was a Swedish comic creator and cartoonist who started his career in 1918 when his first newspaper illustration
popularity: 8
followers: 111
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x75baaf5970cade5b33ab3ed7c8777556ef3349ec5552c45503058f5d8ba8d56e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953980
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953980
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2c5ee91b-ff55-49f8-a964-4e659bd0a1e5.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2c5ee91b-ff55-49f8-a964-4e659bd0a1e5.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/2c5ee91b-ff55-49f8-a964-4e659bd0a1e5
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T17:16:51Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x75baaf5970cade5b33ab3ed7c8777556ef3349ec5552c45503058f5d8ba8d56e","name":"Oscar Jacobsson","registered_at":"2026-06-16T04:58:20Z","symbol":"NIM0944621","token_address":"0x2507b2f458eec1fd252ac86e68240022e0d8e00c","type":"artist","uuid":"2c5ee91b-ff55-49f8-a964-4e659bd0a1e5"}
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 0x75baaf5970cade5b33ab3ed7c8777556ef3349ec5552c45503058f5d8ba8d56e. Chain 2 (Bitcoin): anchored in block 953982 (2026-06-16T17:42:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c5ee91b-ff55-49f8-a964-4e659bd0a1e5.json and https://artists.proofprofile.net/proofs/artist/2c5ee91b-ff55-49f8-a964-4e659bd0a1e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T17:42:23Z
  text: {"copyright_id":"0x75baaf5970cade5b33ab3ed7c8777556ef3349ec5552c45503058f5d8ba8d56e","name":"Oscar Jacobsson","registered_at":"2026-06-16T04:58:20Z","symbol":"NIM0944621","token_address":"0x2507b2f458eec1fd252ac86e68240022e0d8e00c","type":"artist","uuid":"2c5ee91b-ff55-49f8-a964-4e659bd0a1e5"}