thumb|Bruno Prevedi (photo with 1961 dedication) Bruno Prevedi (21 December 1928 – 12 January 1988) was an Italian tenor, particularly associated with the Italian repertory. Life and career Prevedi
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 0x9ae7b2e0edd6e091de0b0aaf3cf0ba0f872d35bf97e09e0d756be44c0489452c. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2cd49420-7c28-454f-80b3-f2340e32afc4.json and https://artists.proofprofile.net/proofs/artist/2cd49420-7c28-454f-80b3-f2340e32afc4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Orchestra dell'Accademia Nazionale di Santa Cecilia
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 0x1bf9805c8e02bbefc64e4bdf7f9489b4133ff57243af987989eabf705d40f845. 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/GBF076740701.
Medea, Act III: Tu Glauce piange sol, spietato!
Coro dell'Accademia Nazionale Di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401e0b1ebdba6aae44558c856f056dec31aff8da66e7a644c9e0c3ffb959972b. 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/GBF076742219.
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
Madama Butterfly / Act 2: Un bel dì vedremo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43531704207e72a5e0f6d7cc09db4858246bc9e059da8004e4b0223d43642f2b. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBF076610120.
La Bohème / Act 1: "Sì. Mi chiamano Mimì"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5bd14937a0eb749510d317f679e16e74676cdad4dfb82645d643eae86487c2. 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/GBF077110270.
Madama Butterfly / Act 2: Una nave da guerra...Scuoti quelle fronda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf098ecf73df54ae1b3543d93ec4a8df2ec8305bbf25361c2169e8ebcf2b538. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBF075940247.
Nabucco / Act 3: "Va, pensiero" (Chorus of the Hebrew Slaves)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadf79d486e7e5dfccfe63e0154c547dd1f0a87d8764c6b23a90f88990275ba1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBF076540124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfc23d78d6ed1f09f06843f904fd26c65008f9291048ef151e66d4931f57713. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBF076540101.
Nabucco / Act 1: Gli arredi festivi giù cadano infranti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a71d09716500fe2876baed07074a1ef934cb61faaf6011c2557f5eeac0c368. 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/GBF076540102.
Nabucco / Act 2: Che si vuol? ... Il maledetto non ha fratelli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aef93a18d2c449c909c26d71e30989a250d8b15b075b59a37be8ec225e818c5. 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/GBF076540116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d60bb4ee4318e6941647003dcc5c905e8836abbc1dda5eded78db0d015996. 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/GBF076540118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac082e9ed2d97fd2be513d76469463109030a710902c54fbc1b73f042021248. 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/GBF076540105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696705e3a82a07bc0420962b7e95f919fbf80604304bf9bbf7871cfb6e444212. 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/GBF076540106.
Nabucco / Act 1: Tremin gl'insani del mio furore!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa09b48801f213f37f0d9cd1e9dc9cfb8a65cef13cec83ad3dc1fb2cbfb8125. 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/GBF076540109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadf79d486e7e5dfccfe63e0154c547dd1f0a87d8764c6b23a90f88990275ba1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBF076540124.
Nabucco / Act 1: Mio furore, non più costretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aa65b7c5410386f5db57bd55e243ebbd3522cb2e56ab7a38a053324812fa6c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF076540111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a8fb7c60a318af1d1b1a3fc239435bf063af6d0ae40ef80962223d07beaf3d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF076540112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0267329498abcc0ec6564710d10d0fade92a359dae2e3767d03a1d81f470cf. 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/GBF076540127.
Nabucco / Act 4: Oh, dischiuso è il firmamento!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e456b597214c75f86e79c43608acd781ff66d021bc3f9a782027bd74997bd79. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF076540130.
Nabucco / Act 4: Viva Nabucco ... Qual grido è questo?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288262388f9ba21d2b5bf4f119cb4e36711c5a3bc6aac5b405d694c9c76dac34. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBF076540131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb6b95b87209e5930fe55b54be9c62eaf59f961fdfda275e020efd4440d2aa8. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBF076540103.
Nabucco / Act 2: Deh, fratelli, perdonate
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d843e8572e55a61c8ce60c6eb460eff73bcd07bbd4b6857ad06a81f5a3f2560. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBF076540117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4991fa3908df7b9caa0f0154668c7a57e2b7dc77d4ca2b57ff52f159dc9822. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBF076540108.