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 0xca182a38f65957593fde5f244decb52e4108a8e664af8fe5bddea90e40c8a9ef. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c97c677-9299-4517-8b10-7b60b016e39a.json and https://artists.proofprofile.net/proofs/artist/0c97c677-9299-4517-8b10-7b60b016e39a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Puccini: Il tabarro: "O eterni innamorati, buona sera!" (La Frugola, Giorgetta)
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 0x4f2ce975be1e6594d63929ef874d0ce02a51df6d3a2ece9558320dce11459188. 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/GBAYC9702784 — a six-check JSON result.
Puccini: Il tabarro: "To! guarda la mia vecchia!" (Il talpa, La Frugola, Michele, Luigi, Il tinca)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb08b2c544a9f916e05888b506ad2770f09db3f056559a1a9eeee5119b2ffe3. 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/GBAYC9702785 — a six-check JSON result.
Puccini: Il tabarro: "Segui il mio esempio" (Il tinca, Giorgetta, Il talpa, La Frugola)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa02ed74c0b0727357fd1871913dddafd32781199afc998dd978f40076f9f7a3. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702787 — a six-check JSON result.
Puccini: Il tabarro: "È ben altro il mio sogno!" (Giorgetta, La Frugola, Luigi, Il talpa, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e17ec3b9d013359f5d16b0897ab670e4d5f47a1f0a0f58cb00cc37b6e9223d. 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/GBAYC9702788 — a six-check JSON result.
Puccini: Il tabarro: "Miei vecchi, buona notte!" (La Frugola, Il talpa, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb0cc8a80012e78f6483abd20d284c213d9c48f259d0375b47ff8bacc51bb7e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBAYC9702789 — a six-check JSON result.
Puccini: Suor Angelica: "Sorelle in umiltà" (La Sorella zelatrice, La Prima conversa, La Maestra delle novizie, La Seconda conversa, Suor Osmina, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac3d893104591e7da314383724e0c24cfd6fee37bf61e2081dc7c822fc8d55b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702799 — a six-check JSON result.
Puccini: Suor Angelica: "Ed or, sorelle in gioia" (La Sorella zelatrice, Suor Genovieffa, Una novizia, La Maestra delle novizie, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d42b97f91cd65180d66e95b4e5352594bedc6e00ae0ebd407d41c7de0915c0. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBAYC9702800 — a six-check JSON result.
Puccini: Suor Angelica: "I desideri sono i fiori dei vivi" (Suor Angelica, La Sorella zelatrice, Suor Genovieffa, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f568e2cb9cb62e9ebff657369e2421cfe632c3f3335ac162582f2fe1482f422. 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/GBAYC9702801 — a six-check JSON result.
Puccini: Suor Angelica: "Laudata Maria" (La Prima cercatrice, Suor Dolcina, L'altra cercatrice, La Sorella zelatrice, Suor Angelica, Suor Genovieffa, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58205c0c669179aa096caf0ef2d80054ffa75ea12c5874213d1fbe32c432f2f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC9702804 — a six-check JSON result.
Puccini: Gianni Schicchi: "Povero, Buoso!" (Zita, Simone, Rinuccio, La Ciesca, Marco, Nella, Gherardo, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eff969d601808f159d2c4d47b8ac910d80325edcdf6b7bd64ffa392a769d23c. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/GBAYC9702817 — a six-check JSON result.
Puccini: Gianni Schicchi: "O Simone?" (Gherardo, La Ciesca, Zita, Marco, Simone, Nella, Rinuccio, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1fe5b07576d28a96b272ed675a9a91a4a5bc651c0073b9956579fbb4549723. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702818 — a six-check JSON result.
Puccini: Gianni Schicchi: "È aperto!" (Zita, Simone, La Ciesca, Marco, Simone, Nella, Rinuccio, Gherardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef63cb2ce2e44ff8e18a96217f49338a493f22a08226d01c4cac5afb834a3e8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702819 — a six-check JSON result.
Puccini: Gianni Schicchi: "Dunque era vero!" (Simone, La Ciesca, Marco, Betto, Nella, Zita, Rinuccio, Gherardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa728cffd81789eb7c3330ba26ac102016ff7bc7adb990fae0770bd978d1366a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702820 — a six-check JSON result.
Puccini: Gianni Schicchi: "Quale aspetto sgomento e desolato!" (Schicchi, Rinuccio, Lauretta, Gherardo, Zita, La Ciesca, Nella, Simone, Marco, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd00758c31728accfb3bec029bc74a5ff5271c8983d4c25dedbd4940ab81a9e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702824 — a six-check JSON result.
Puccini: Gianni Schicchi: "Brava la vecchia! Brava!" (Schicchi, Lauretta, Rinuccio, Zita, La Ciesca, Nella, Gherardo, Simone, Marco, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ed7fdc62b5dc256b90bf6c13bfbc8c8a8539aa3fd59a712940e27f5d778876. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702825 — a six-check JSON result.
Puccini: Gianni Schicchi: "Datemi il testamento!" (Schicchi, Lauretta, Rinuccio, Zita, La Ciesca, Nella, Gherardo, Marco, Simone, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d68e58b1232095b8e6b2de51fecba7c94999f9b8958960a58f87b1be77fbcfb. 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/GBAYC9702827 — a six-check JSON result.
Puccini: Gianni Schicchi: "Nessuno sa che Buoso ha reso il fiato?" (Schicchi, Zita, La Ciesca, Nella, Rinuccio, Gherardo, Marco, Simone, Betto, Maestro Spinelloccio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15a1d8e433adb21a5c4702d0d765c3e57ad9aeaea3fc349f38de4a293a615cb. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702828 — a six-check JSON result.
Puccini: Gianni Schicchi: "Era eguale la voce?" (Schicchi, Zita, La Ciesca, Nella, Rinuccio, Gherardo, Marco, Simone, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a475d5246bc1d8ab43e4859109c46b1ac4c16a11b30938cd25e10287553b9e9. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBAYC9702829 — a six-check JSON result.
Puccini: Gianni Schicchi: "In testa la capellina!" (Schicci, Zita, La Ciesca, Nella, Rinuccio, Gherardo, Marco, Simone, Betto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfb00165bbf0118af80281002bff25253bc8dff7efcc2e541a8bc7fbfab5980. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9702830 — a six-check JSON result.
Puccini: Gianni Schicchi: "Schicchi! Schicci!" (Zita, La Ciesca, Nella, Rinuccio, Gherardo, Marco, Simone, Betto, Schicchi, Lauretta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee31ef3e6cef474c9135c7599dc8d890bb9b3b7f0035ed314199423c11acc3d. 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/GBAYC9702831 — a six-check JSON result.