thumb| Valer Barna-Săbăduș (born 15 January 1986), also Valer Sabadus, is a Romanian-German countertenor. He sings in both the alto and soprano range. Life Barna-Sabadus was born in Arad (Romania),
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b4d13a44baa0149cb5c3a548bf8e528845c5f7fe2016eb6dc85c35010eb4b8. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2bd19428-17e6-4fe8-ae62-175a4b9e2d51.json and https://artists.proofprofile.net/proofs/artist/2bd19428-17e6-4fe8-ae62-175a4b9e2d51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vinci: Artaserse, Act 1: "Vo solcando un mar crudel" (Arbace)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0249180466b5984d2fd8f1c939d922ca2b5e69beb3b6d41b325bcdc7d83ed7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf21f68d040b78bd3fa79aa07c6b2326ba42429e791aa8d7edcd074fe05a257. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b19563d809811a050ad18e11fc31d4b0751660e75d83abd3d752f40f8eb5fd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200025.
Vinci: Artaserse, Act 1: "Conservati fedele" (Mandane)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab2d0340f75172efe3573af0768d00588ed2f5a3269aa046ee57745b155e1e0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200028.
Vinci: Artaserse, Act 1: "Coraggio o miei pensieri" (Artabano, Artserse)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda04e662412131672a23757b6ad02b09fa3a6c9edfbcca7a8040c05ec6a372c9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200033.
Vinci: Artaserse, Act 1: "Bramar di perdere troppo affetto" (Semira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66aa05f9b72ecdf4d9b01d4b144eb2bc092dbee11a835ba94368340f9f58814. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200043.
Vinci: Artaserse, Act 2: "Non temer ch'lo mai ti dica" (Megabise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4a4b8f3dfbcf14e81491047cf232f7b7f3607cd716b3b38effa2ba36688e19. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe511c6ac59a4f0364abf8f89d53176622be5278e006c052b31bc47e6210b91b5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200024.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Vinci: Artaserse, Act 1: "Fra cento affani" (Arbace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03173cc3f19a32ee5e6a638dc4f9fc5ffb33643299c2a2d74cd5d29a67b0dc10. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200031.
Vinci: Artaserse, Act 1: "Su le sponde del torbido lete" (Artabano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365bba3bd04e123b19ac6c59cd134db498c578a0060b86873aa23e17d12c854e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200034.
Vinci: Artaserse, Act 1: "Per pietà, bell'idol mio" (Artaserse)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218a91a3632876df66e0646f87fbe43390bc19fab26dc62c64c76d3076894684. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200037.
Vinci: Artaserse, Act 1: "Sogna il guerrier le schiere" (Megabise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad03a5a198748e4b4159d0d0637a7b6f8a218bc51c5bfd371f1b880b5e8d7c2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200040.
Vinci: Artaserse, Act 2: "Amalo e se al tuo aguardo" (Artabano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953e788d552a1e21d6204b1c4e7681da9a63cc47d3d9187a12262eef853b7a1d. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200072.
Vinci: Artaserse, Act 1: "Addio. Sentimi Arbace" (Arbace, Mandane)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e50de2242af9e558fe29c297655493c5d421c9cbb2de5141896edbd1fcdb7c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200027.
Vinci: Artaserse, Act 1: "Figlio, Arbace. Signor" (Artabano, Arbace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6762d05f52c4b7ea4cceb2620f7e4aa4491ea8b01d5e7918e46ded7b5136a326. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200030.
Vinci: Artaserse, Act 1: "Deh respirar lasciatemi" (Artaserse)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7910a8c7c936f9bafe2ad58623794501e9029a9c632d199f521f6f34ea8c3b50. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200050.
Vinci: Artaserse, Act 2: "Rendimi il caro amico" (Artaserse)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a54876ab37805611365d2b1b96241003c6f9fddbd9d82af0fdae40af0e11483. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200066.
Vinci: Artaserse, Act 2: "Mi scacci sdegnato!" (Arbace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d76a32824aacbb666aeb26c8b53cde47dbfe9a54da3d7b864dc5f8640c4357. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200069.
Vinci: Artaserse, Act 1: "Qual vittima si svena!" (Artaserse, Megabise) - "Dove, principe, dove?" (Semira, Artaserse)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59f231db5f18a41bbac9e74904b9156c5ce37400f447648e045e8874099135e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200036.
Vinci: Artaserse, Act 1: "Gran cose io temo" (Semira, Megabise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc139fcb10d6a7706ec42d0c23698c51267cae2ff9473d9cd590d9680aa029356. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW1200039.