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 0x57f4734ad5a837a756665c15e5c925edf66d361c250adaf2d272fee75a3a520c. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15424a3a-88eb-47be-9441-e1f00ef6570d.json and https://artists.proofprofile.net/proofs/artist/15424a3a-88eb-47be-9441-e1f00ef6570d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L'Orfeo, SV 318, Atto II: In un fiorito prato (Messagiera, Pastori)
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 0xa7a999494105bbee595a784d4dc073a6a17e71e6b95208bff554d93b578adbff. 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/FRZ149501110.
Maddalena ai piedi di Cristo: No. 34 Recitativo Amor Terreno, Amor Celeste, Fariseo, Maddalena "Maddalena, deh, ferma!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf16f7345a6a6a6f674e1e8dc151ebc9c18ff878fab16039de4faf72ce28a56f. 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/FRZ149642060.
Maddalena ai piedi di Cristo: No. 45 Aria Fariseo "Chi drizzar di pianta adulta"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d80e152901562a64c239e1b19a9f0def0af8efe40e798b68aa4615e947e08a2. 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/FRZ149642170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c610e29df67f29610269c311eb7aea4e0604d2d386e353f1eb750acfaebd2e. 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/FRZ148916030.
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
L'Orfeo, SV 318, Atto II: In questo prato adorno (Pastori, Coro, Orfeo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393fb9a588b6feca16bd1da5cd99858ae3ddd02fb3ca51ef4a91590044b81a31. 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/FRZ149501090.
L'Orfeo, SV 318, Atto II: Ahi caso acerbo! (Messagiera, Pastori, Orfeo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafaae6dff7aafcd1eb8675e4775c17b26c542e9e3d9a56b154e0fc64d591df0e. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FRZ149501100.
Maddalena ai piedi di Cristo: No. 30 Recitativo Fariseo "Donna grande e fastosa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1005b2b61d362944d8628e552c8c5f3eb1bc16e3847191dc14a9ff83f2000ef. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149642020.
Maddalena ai piedi di Cristo: No. 31 Aria Fariseo "Parti, che di virtù il gradito splendor"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c7b71a6c4ac978f2fa1b3f22bfffd684b5b1ece941166eb592ae99819721da. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRZ149642030.
Maddalena ai piedi di Cristo: No. 32 Recitativo Maddalena, Cristo, Fariseo "Cingan pure quest'alma"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80cdee6a00f677cca882fec37e0c1ac6c8803dfbb9efe7bbbe2f6c7fa529fc3. 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/FRZ149642040.
Maddalena ai piedi di Cristo: No. 44 Recitativo Maddalena, Fariseo "Mio Dio, mio Redentor"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc3e5185aa2f164f54a84ed55e0eb12c49548105222c3dc1ba3b5126574d213. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149642160.