Ultimatum
type: MusicGroup
genre: mexican rock
genre: speed metal
genre: thrash metal
description: thumb|right|314px|The 1853 negotiations between Russian envoy, Prince Menshikov, and the Turkish Sultan about the protection of Orthodox Christians in the Ottoman Empire involved a series of ultimata.
popularity: 5
followers: 2309
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x75bfbe045b0d96129f5156ff733d37d327a8e61ddea1a765173e609b5e8b5c20
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 954667
additional property: OTSBitcoinBlockVerifyURL
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  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/dafcbd86-e18f-453f-b0da-14ef30a0854d.ots
additional property: OTSRecordURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
additional property: OTSVerifyInstructions
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  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75bfbe045b0d96129f5156ff733d37d327a8e61ddea1a765173e609b5e8b5c20. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dafcbd86-e18f-453f-b0da-14ef30a0854d.json and https://artists.proofprofile.net/proofs/artist/dafcbd86-e18f-453f-b0da-14ef30a0854d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
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