Chad Lefkowitz-Brown
type: MusicGroup
description: Chad Lefkowitz-Brown (known as Chad LB) (born September 8, 1989) is a New York-based saxophonist and recording artist recognized for his work as a soloist in the genres of jazz and pop music. He was a
popularity: 11
followers: 18
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf578a1febf614b4d36f33115db664758827ea6a21b36012361451a31ce2e7c7e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953602
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953602
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0e98c53c-902b-4843-ba88-2cb77e82472a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0e98c53c-902b-4843-ba88-2cb77e82472a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0e98c53c-902b-4843-ba88-2cb77e82472a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T06:58:10Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf578a1febf614b4d36f33115db664758827ea6a21b36012361451a31ce2e7c7e","name":"Chad Lefkowitz-Brown","registered_at":"2026-06-14T05:59:49Z","symbol":"NIM0360346","token_address":"0x85944164a6faa59d331fae27530bff00fbd22a82","type":"artist","uuid":"0e98c53c-902b-4843-ba88-2cb77e82472a"}
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 0xf578a1febf614b4d36f33115db664758827ea6a21b36012361451a31ce2e7c7e. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e98c53c-902b-4843-ba88-2cb77e82472a.json and https://artists.proofprofile.net/proofs/artist/0e98c53c-902b-4843-ba88-2cb77e82472a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-14T06:58:10Z
  text: {"copyright_id":"0xf578a1febf614b4d36f33115db664758827ea6a21b36012361451a31ce2e7c7e","name":"Chad Lefkowitz-Brown","registered_at":"2026-06-14T05:59:49Z","symbol":"NIM0360346","token_address":"0x85944164a6faa59d331fae27530bff00fbd22a82","type":"artist","uuid":"0e98c53c-902b-4843-ba88-2cb77e82472a"}