Sirko
type: MusicGroup
description: "Sirko" () is a Ukrainian folk tale (kazka) about a friendship between an old dog and a wolf. Plot summary The father of a family with a dog named Sirko casts the dog out after many years. Sirko t
popularity: 6
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcb128730f550faf66e48cf301815a00a966ee18845ec912c53eded1dcce0dcfe
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953847
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953847
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0141cb03-64ab-4b21-b644-0d4aed04df7b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0141cb03-64ab-4b21-b644-0d4aed04df7b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0141cb03-64ab-4b21-b644-0d4aed04df7b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T22:51:00Z
additional property: OTSCanonicalRecord
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 0xcb128730f550faf66e48cf301815a00a966ee18845ec912c53eded1dcce0dcfe. Chain 2 (Bitcoin): anchored in block 953847 (2026-06-15T22:51:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0141cb03-64ab-4b21-b644-0d4aed04df7b.json and https://artists.proofprofile.net/proofs/artist/0141cb03-64ab-4b21-b644-0d4aed04df7b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T22:51:00Z