Sofia Soloists Chamber Orchestra
type: MusicGroup
genre: chamber music
description: The Sofia Soloists Chamber Orchestra (SSCO) is a chamber music ensemble based in Sofia, Bulgaria. SSCO was established in 1962 by a group of young musicians with the Sofia National Opera. Their firs
popularity: 4
followers: 49
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0x139adbf8eab2788a4fbd940b43212220ed2048804e43a7c7a61af7f4bd10ac1e
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954705
additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/ebbf8e1c-fcfb-4a4a-a018-eefa0ca4f62b.ots
additional property: OTSRecordURL
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additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ebbf8e1c-fcfb-4a4a-a018-eefa0ca4f62b
additional property: OTSTimestamp
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  value: 2026-06-21T13:42:37Z
additional property: OTSCanonicalRecord
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139adbf8eab2788a4fbd940b43212220ed2048804e43a7c7a61af7f4bd10ac1e. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebbf8e1c-fcfb-4a4a-a018-eefa0ca4f62b.json and https://artists.proofprofile.net/proofs/artist/ebbf8e1c-fcfb-4a4a-a018-eefa0ca4f62b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T13:42:37Z
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album: Emil Tabakov: Complete Symphonies, Vol. 7 (Live)
  type: MusicAlbum
  date published: 2022-09-02