David Laibman
type: MusicGroup
genre: ragtime
description: David Laibman (born December 25, 1942) is an American economist. He is a professor emeritus of economics at Brooklyn College and the Graduate Center of the City University of New York. He is the edito
popularity: 3
followers: 218
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0x8d87d5eedf2cf75ade3ce17468f579d23de99ad7056d03b8cee09dc33ebd2563
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSProofURL
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additional property: OTSRecordURL
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  value: https://artists.proofprofile.net/proofs/artist/4c6f967d-bd24-44eb-8166-42379a355db6.json
additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4c6f967d-bd24-44eb-8166-42379a355db6
additional property: OTSTimestamp
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additional property: OTSCanonicalRecord
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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 0x8d87d5eedf2cf75ade3ce17468f579d23de99ad7056d03b8cee09dc33ebd2563. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c6f967d-bd24-44eb-8166-42379a355db6.json and https://artists.proofprofile.net/proofs/artist/4c6f967d-bd24-44eb-8166-42379a355db6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
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album: The New Ragtime Guitar
  type: MusicAlbum
  date published: 1971-01-01
album: Adventures in Ragtime
  type: MusicAlbum
  date published: 2009-12-07