Sarah Zeffer
type: MusicGroup
popularity: 4
followers: 93
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd592ef76d5065a871735537efffe0a429eaeaa40095ecc17d9334411879a1a03
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953922
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953922
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1b7c4aef-e920-44c3-95e2-8baf4f59eab9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1b7c4aef-e920-44c3-95e2-8baf4f59eab9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1b7c4aef-e920-44c3-95e2-8baf4f59eab9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T09:36:34Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd592ef76d5065a871735537efffe0a429eaeaa40095ecc17d9334411879a1a03","name":"Sarah Zeffer","registered_at":"2026-06-15T23:00:54Z","symbol":"NIM0859252","token_address":"0xf004d9c26994c58ecf9453bcf95bda8490fef0ba","type":"artist","uuid":"1b7c4aef-e920-44c3-95e2-8baf4f59eab9"}
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 0xd592ef76d5065a871735537efffe0a429eaeaa40095ecc17d9334411879a1a03. Chain 2 (Bitcoin): anchored in block 953922 (2026-06-16T09:36:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b7c4aef-e920-44c3-95e2-8baf4f59eab9.json and https://artists.proofprofile.net/proofs/artist/1b7c4aef-e920-44c3-95e2-8baf4f59eab9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T09:36:34Z
  text: {"copyright_id":"0xd592ef76d5065a871735537efffe0a429eaeaa40095ecc17d9334411879a1a03","name":"Sarah Zeffer","registered_at":"2026-06-15T23:00:54Z","symbol":"NIM0859252","token_address":"0xf004d9c26994c58ecf9453bcf95bda8490fef0ba","type":"artist","uuid":"1b7c4aef-e920-44c3-95e2-8baf4f59eab9"}
album: Meu Veneno
  type: MusicAlbum
  date published: 2022-09-23
album: Ciúmes
  type: MusicAlbum
  date published: 2023-06-30