David Marr
type: MusicGroup
description: David Marr may refer to: David Marr (neuroscientist) (1945–1980), British neuroscientist David Marr (journalist) (born 1947), Australian journalist and biographer David G. Marr (born 1937), Americ
popularity: 2
followers: 18
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xed68c9c9815c90650cc900e144b16351904f0884077af5f45f6285ba4fecfc09
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/945f67d8-1a6b-44ca-97a3-b50d751cf941.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/945f67d8-1a6b-44ca-97a3-b50d751cf941.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/945f67d8-1a6b-44ca-97a3-b50d751cf941
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xed68c9c9815c90650cc900e144b16351904f0884077af5f45f6285ba4fecfc09","name":"David Marr","registered_at":"2026-06-17T17:24:38Z","symbol":"NIM1466196","token_address":"0xcb2673b4f6e14ac56293c778eeac8b0680da9ee7","type":"artist","uuid":"945f67d8-1a6b-44ca-97a3-b50d751cf941"}
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 0xed68c9c9815c90650cc900e144b16351904f0884077af5f45f6285ba4fecfc09. 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/945f67d8-1a6b-44ca-97a3-b50d751cf941.json and https://artists.proofprofile.net/proofs/artist/945f67d8-1a6b-44ca-97a3-b50d751cf941.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0xed68c9c9815c90650cc900e144b16351904f0884077af5f45f6285ba4fecfc09","name":"David Marr","registered_at":"2026-06-17T17:24:38Z","symbol":"NIM1466196","token_address":"0xcb2673b4f6e14ac56293c778eeac8b0680da9ee7","type":"artist","uuid":"945f67d8-1a6b-44ca-97a3-b50d751cf941"}