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 0xd7c45c026fe31a6f2302465a404f789525617f0d5552744fed3d4524f884524d. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4a28764-3975-4bd5-8e8b-150f56d9bc31.json and https://artists.proofprofile.net/proofs/artist/a4a28764-3975-4bd5-8e8b-150f56d9bc31.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Orchestra del Teatro Comunale di Bologna
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 0xc2cf3615116f7546c1c99fcdaeb1df0a885b89df653447dad626abe9bcaf3de6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940401 — a six-check JSON result.
Rigoletto / Act 2: Ella mi fu rapita...Parmi veder le lagrime
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebc089450b90f5d7372eefda33ab4b2932ef574ed476f73d9c264a1bff53d2d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940415 — a six-check JSON result.
Rigoletto / Act 1: Introduzione. "Della mia bella incognita borghese"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a8de843c4340d4e22085268d97e294cb1f73af159fe39dee71d80d0b02b393. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940402 — a six-check JSON result.
Rigoletto / Act 1: Questa o quella...Partite? Crudele!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde127e3fab3adc7237e882d51984f7d70d1fb6c69dd19be1cf88ba9274ff843. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940403 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373c0586b88bb9f5f5375c0d82196a2c8f6b2f087cc0fec6f7427069abafb45a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940417 — a six-check JSON result.
Rigoletto / Act 1: Gran nuova! Gran nuova! - Tutto è gioia, tutto è festa (Scena e Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3d536ffdee1768f23fab4287b22aa49bd3e50535f345edaa7bfba929a2125c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940404 — a six-check JSON result.
Rigoletto / Act 2: Scena ed Aria. "Povero Rigoletto!" - "La rà, la rà"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae42643ce05831a9bf51d235535515fb530d643bf85679458ae554ec487298e2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940418 — a six-check JSON result.
Rigoletto / Act 2: Cortigiani, vil razza dannata...Ebben piango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0202074ceef0cc96d0d8ea45acacad91b413744602a8ad6ca337322368e033. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940419 — a six-check JSON result.
Rigoletto / Act 2: Schiudete, ire al carcere
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c5b732875da6e5b7a6423a4060dfcac9c4e9a4b4060ba12942331cd112768f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940421 — a six-check JSON result.
Rigoletto / Act 1: Figlia..Mio padre! - Quanto dolor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57815f638d19a362c41736a924a8d21e0a6329108eae0a6a1d88bd56a6dca972. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940408 — a six-check JSON result.
Rigoletto / Act 1: Veglia, o donna, questa fior
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0112b27e96a03866eb1ba5f619a26be8888a7dd6bd76b737b3efb9d4f199bb5a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940409 — a six-check JSON result.
Rigoletto / Act 3: La donna è mobile - E là il vostr'uomo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe837e53e8fc8aefca8022cb103b64ec2d6cc7fc584b6270241509d89e5cf083. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940423 — a six-check JSON result.
Rigoletto / Act 1: Giovanni, ho dei rimorsi...E il sol dell'anima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8dfb74b92800bdc895ec71258b743a6f4fadbb4d5812f623eda47205868843. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940410 — a six-check JSON result.
Rigoletto / Act 3: Quartetto. "Un dì, se ben rammentomi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104868dbe020e70eb32bd53be2b3f2274fa4fd9705d9b0822392690f45e6086a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940424 — a six-check JSON result.
Rigoletto / Act 1: Che m'ami, deh, ripetimi - Addio... speranza ed anima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7f27e32c6914858b64de12dd7cd925ffa5d924c444ef74477792058c0b70da. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940411 — a six-check JSON result.
Rigoletto / Act 3: Bella figlia dell'amore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecd0c4d1a0aae2acbe2d7b78a1039d48c2b5fce58ce55a8f156f35ee2af60d6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940425 — a six-check JSON result.
Rigoletto / Act 1: Scena ed Aria. "Gualtier Maldè" - "Caro nome"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb437911c54ac9f29580999c4fe9a00109069b0599a93f4b12aa78261d35792fd. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940412 — a six-check JSON result.
Rigoletto / Act 1: Zitti, zitti...Soccorso, padre mio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aebc780ce105e815e5a584520050d92b2bb42837c7ad09f35d3358e284ea361. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078940414 — a six-check JSON result.
Perosi: Le 7 parole di N.S. Gesù Cristo sulla croce (Live)