Leonard Tan
type: MusicGroup
description: Leonard Tan is a trinational-based, Singaporean music director, conductor, tubist, violinist, and music educator at scholastic, collegiate, conservatory, and professional levels Tan was awarded the N
popularity: 3
followers: 50
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe8e7f69d9ce8b9e0cdd5e3410921742dd8c3a2437c6118c904847a7b40e5245c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954017
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954017
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/377ae486-990c-4bb9-b231-2af8b65c0fd1.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/377ae486-990c-4bb9-b231-2af8b65c0fd1.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/377ae486-990c-4bb9-b231-2af8b65c0fd1
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T23:38:33Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xe8e7f69d9ce8b9e0cdd5e3410921742dd8c3a2437c6118c904847a7b40e5245c","name":"Leonard Tan","registered_at":"2026-06-16T08:51:42Z","symbol":"NIM1000357","token_address":"0xe0b51f6898890158ee3dd91a371bf19dca95d600","type":"artist","uuid":"377ae486-990c-4bb9-b231-2af8b65c0fd1"}
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 0xe8e7f69d9ce8b9e0cdd5e3410921742dd8c3a2437c6118c904847a7b40e5245c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/377ae486-990c-4bb9-b231-2af8b65c0fd1.json and https://artists.proofprofile.net/proofs/artist/377ae486-990c-4bb9-b231-2af8b65c0fd1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xe8e7f69d9ce8b9e0cdd5e3410921742dd8c3a2437c6118c904847a7b40e5245c","name":"Leonard Tan","registered_at":"2026-06-16T08:51:42Z","symbol":"NIM1000357","token_address":"0xe0b51f6898890158ee3dd91a371bf19dca95d600","type":"artist","uuid":"377ae486-990c-4bb9-b231-2af8b65c0fd1"}