Mark Spoelstra
type: MusicGroup
genre: folk
description: Mark Warren Spoelstra (June 30, 1940 – February 24, 2007) was an American singer-songwriter and folk and blues guitarist. Biography He was born and raised in Kansas City, Missouri. He began his music
popularity: 4
followers: 444
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x41ff235627961b31c63390ff6011448d14a9d34eb3a9aec7be3e22fa0dc647d1
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x41ff235627961b31c63390ff6011448d14a9d34eb3a9aec7be3e22fa0dc647d1","name":"Mark Spoelstra","registered_at":"2026-06-17T16:58:40Z","symbol":"NIM1459993","token_address":"0xec4ac93b8f9ed963e0a3c5e909a8b9f77aa39abf","type":"artist","uuid":"931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6"}
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 0x41ff235627961b31c63390ff6011448d14a9d34eb3a9aec7be3e22fa0dc647d1. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6.json and https://artists.proofprofile.net/proofs/artist/931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0x41ff235627961b31c63390ff6011448d14a9d34eb3a9aec7be3e22fa0dc647d1","name":"Mark Spoelstra","registered_at":"2026-06-17T16:58:40Z","symbol":"NIM1459993","token_address":"0xec4ac93b8f9ed963e0a3c5e909a8b9f77aa39abf","type":"artist","uuid":"931ccedf-bb3a-44ae-8ffe-1cd172c0f7d6"}
album: Mark Spoelstra Recorded at Club 47
  type: MusicAlbum
  date published: 1963-01-01
album: The Songs of Mark Spoelstra
  type: MusicAlbum
  date published: 1963-01-01
album: Five & Twenty Questions
  type: MusicAlbum
  date published: 1965
album: State of Mind
  type: MusicAlbum
  date published: 1966
album: Mark Spoelstra
  type: MusicAlbum
  date published: 1969-03-05
album: Mark Spoelstra Live In San Francisco 1965
  type: MusicAlbum
  date published: 2016-04-27
album: Mark Spoelstra Live
  type: MusicAlbum
  date published: 2019-04-15