Yochk'o Seffer
type: MusicGroup
genre: french jazz
popularity: 3
followers: 343
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x940a3c6699fbcbf22665d44d62f10a3352cc5a41546ac1a9bcd421c6115d74c4
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954500
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954500
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T04:47:29Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x940a3c6699fbcbf22665d44d62f10a3352cc5a41546ac1a9bcd421c6115d74c4","name":"Yochk'o Seffer","registered_at":"2026-06-20T04:04:21Z","symbol":"NIM1505541","token_address":"0x90a5a7c1e79c9071fbf4a9eee1f6e36d412d07d9","type":"artist","uuid":"9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3"}
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 0x940a3c6699fbcbf22665d44d62f10a3352cc5a41546ac1a9bcd421c6115d74c4. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3.json and https://artists.proofprofile.net/proofs/artist/9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T04:47:29Z
  text: {"copyright_id":"0x940a3c6699fbcbf22665d44d62f10a3352cc5a41546ac1a9bcd421c6115d74c4","name":"Yochk'o Seffer","registered_at":"2026-06-20T04:04:21Z","symbol":"NIM1505541","token_address":"0x90a5a7c1e79c9071fbf4a9eee1f6e36d412d07d9","type":"artist","uuid":"9b5b564e-9d9c-4bbc-809e-9b2151ba4cf3"}
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