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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7ed20d4d5b42cf6debea054c351232f4e624ab23bf792cf758afd8cd67a4b6. 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/c4b1989e-6a8f-4b62-833b-1267d8b704f0.json and https://artists.proofprofile.net/proofs/artist/c4b1989e-6a8f-4b62-833b-1267d8b704f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert: Claudine von Villa Bella, D. 239, Fernando, D. 220 & Kantate zu Ehren von Josef Spendou, Op. 128, D. 472
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc722eb0ccdbcfa5b5db8b2acca79c4ad4c5f51a50202fc285a92b5462c1679f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLA507511002.
I due Foscari / Act 1: Scena: "Qui ti rimani". Arioso: "Brezza del suol natio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9464f2addcdc90e0d79111e54d1baad191e6c610fac1a913aa40e7891b9724. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLA507511003.
I due Foscari / Act 1: Cavatina: "Dal più remoto esilio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2573e1c06a5a903ac66da180f1d57618183312848509529e3d20a0dda6fef04d. 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/NLA507511004.
I due Foscari / Act 1: Cabaletta: "Odio solo, ed odio atroce"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9106a0e3014d2ace97f66d8e0d67cfb6c00533270f2cf401bed84c6e65af6ab7. 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/NLA507511005.
I due Foscari / Act 1: Scena: "No... mi lasciate"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55529a0221ca5783af6909d34b106dc420f1c296dab48903b6eb6be186305c8b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLA507511006.
I due Foscari / Act 1: Cavatina: "Tu al cui sguardo onnipossente"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa51abbb036d0da630649fa090f27a21a74c8aa94a6c82c2e01199fb4be418ae. 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/NLA507511007.
I due Foscari / Act 1: Scena e Cabaletta: "Che mi rechi?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594a6280c131f255ea0b84dd49d799b7e35d9dea3b27b419bf371c583bd2b3e6. 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/NLA507511008.
I due Foscari / Act 1: Coro: "Tacque il reo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2780f6256e6af3719d35acefb2dae1a68fc561d25d19a1eed51edfe069c35adc. 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/NLA507511009.
I due Foscari / Act 1: Scena: "Eccomi solo alfine"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a379bca1b1ab3d98ccda5f3b3a48e60b8feb6da521ed0283b99646b0851064. 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/NLA507511010.
I due Foscari / Act 1: Romanza: "O vecchio cor, che batti"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cd502eb63a4bd22219a18651a8a9a4f6532b8b21f6d640e9f712155212a429. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLA507511011.
I due Foscari / Act 1: Finale. Scena: "L'illustre dama Foscari"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7ae4a26e79f82b72bb96f4096f037437f86c54988c7389dd5221c8162bda0d. 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/NLA507511012.
I due Foscari / Act 1: Duetto: "Tu pur lo sai"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c17ce6043ef91cdb8d2b8f63ab1f49c88a8db6a3fdbd8195ed6e416cfd163e. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/NLA507511013.
I due Foscari / Act 1: "Di sua innocenza dubiti?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95483831620df39ff5def4f0ceac586eec855c6b92c36ac078020f58f8a7947. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/NLA507511014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e31c3d95813dd6e9485ef88939954fd06ae8627740bb1d444bd50ec02381e05. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLA507511015.
I due Foscari / Act 2: Scena: "Notte! perpetua notte"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e29a319172355a2713de8d09d45004ea4bdba4a2555c58aba739697b4cbe566. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLA507511016.
I due Foscari / Act 2: Preghiera: "Non maledirmi, o prode"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e200626aca62952070db0652718930978aa7e75165de36991e3561f617c3c9f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLA507511017.
I due Foscari / Act 2: Scena: "Ah, sposo mio!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc669595bce564cb3ee6478f3dd43126fcce54be2bf8429afc5047659cf3ad58d. 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/NLA507511018.