Giorgio Tozzi (January 8, 1923 – May 30, 2011) was an American operatic bass. He was associated with the Metropolitan Opera for many years and sang principal bass roles in nearly every major opera ho
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 0x50d5b6c813201d7bb27908642cc4a5ce98d42e33103ec4f4933469797f9f39f5. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9c661b8-0eb9-4614-aa10-2b872db1b163.json and https://artists.proofprofile.net/proofs/artist/f9c661b8-0eb9-4614-aa10-2b872db1b163.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Fidelio (Live Recording 1960)
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 0xb29ebee67d8fc3d4f3cf0c20f60fb399f26e9a92b1ac49c0ed8469a11c7719c6. 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/USBC19605840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294846a4ce08ec3b1565a9f17fe15e069da3848e7128d2d9928b613da4822085. 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/USBC19605858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62b89f9be5b9c0a99e8fa1d988673a2fcfa1055f41b4c58a1975228a960c69b. 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/USBC19605842.
Turandot: Act I, O giovinotto! (Funeral March)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f9cceb13da4b4d270a67c53f358550ee9a0bfa11dc73bf85a48827cc05ec2a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBC19605843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9cf9228928f91351197db5e6d4c20c03cbc941ef1f6ee22cba8f04bb85286b. 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/USBC19605844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2ea497a9ef3d962c4930747f79afa19c2b1261de0ec2e01b53d444d21b6d0e. 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/USBC19605845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b951697ecf0af015cacc66d80132d822633731e94a0b746075c66f1d0415755. 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/USBC19605848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37276f460ac24dbdbc4522a3a13f10bdb941f3b431065d9a3af227242064da6. 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/USBC19605866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7dc5c2fb2a1c0cb8d9d86a88267e7cd11045757f7c1ece6eae49766b221c58. 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/USBC19605849.
Turandot: Act I, Ah! Per l'ultima volta!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5aaf9e4ab1d49b836410b3aeaf31d704befb4a22026e66157b50c584b65fa77. 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/USBC19605850.
Turandot: Act III, Straniero, tu non sai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b89c29b2b6d87615ceda3dfeb43b97cd8bcca9eb03cf6a5606b58c9168ba35. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/USBC19605868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca784dd9e148452d4cf9c905dc38f83f7e25c97d5163a8084e24f4d4674c6d6. 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/USBC19605851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe28b291a84c8cbf3c88931f5e92317b89b42e402fcb2a912ee0940ba26b1ad8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBC19605869.
Turandot: Act II, Ho una casa nell' Honan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d2de8b6e5cd22fc88c1845aaa056172c52c4c6fff1313d3baddf51bb945b96. 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/USBC19605852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf571bf04bb9a0bf74288f3ba787f7ca929c3754af0d40137215ce5ef6edf181f. 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/USBC19605870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3653e4f77a40b552b1e68e3184060a72a39a8951683f486018ad4298beaa8468. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USBC19605853.
Turandot: Act III, Tu che di gel sei cinta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84d122b25ae49b1bebe41776032f3b9abf5b9fe435417c351b8e897e08e85d6. 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/USBC19605871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c85b3d9dcc9cafc3934dab5d5a1f5a1bdbc58e70822b8adb568b83367f15c96. 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/USBC19605872.
Turandot: Act II, Gravi, enormi ed imponenti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907fc415dcb887bd9b96d87caae4368ddf3c277d4758abf80a3f86fe99cee52e. 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/USBC19605855.
Mozart: Le nozze di Figaro, K. 492 (Live)
Mussorgsky: Boris Godunov (Sung in English) [Live Recording 1956]
Some Enchanted Evening (From "South Pacific")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a245884c2f157250c5e8132b7b09e87bf8767e78dc4af72fa1c4d5b0151487. 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/AUXN22441158.
Twin Soliloquies / Some Enchanted Evening
Rodgers & Hammerstein: South Pacific (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8425c49ccd11f5f78072140a298e1937447ad067f49a01062b5618ebf369f5. 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/GBH5G1401475.