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 0xf753fc2fbf899381caec1b0f96c27a0e21a9791768239e4a669e47906ac1ad17. Chain 2 (Bitcoin): anchored in block 953879 (2026-06-16T02:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08f1a82d-0823-4891-888a-5c831be5eef5.json and https://artists.proofprofile.net/proofs/artist/08f1a82d-0823-4891-888a-5c831be5eef5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Orchestra of the Teatro Massimo Bellini, Catania
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 0xdff3c6cd771578dd7a8e2451404de454eaad0028a64675559a6caf45a4c63ca8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ITZ040500019 — a six-check JSON result.
Cavalleria rusticana: "O lola ch'ai di latti la cammisa" (Siciliana)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9e9e6b15a1ce5004c126453421e912e2378dd2d21d491e0be9b9195814c753. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ITZ040500020 — a six-check JSON result.
Chorus of the Teatro Massimo Bellini, Catania
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a7370d2dc0eeb66d6bbb63f0bb0661290225e2464bd4099a8ed42a33b57aa4. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ITZ040500021 — a six-check JSON result.
Cavalleria rusticana: "Gli aranci olezzano sui verdi margini"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d23734306bc3450963fe40be156f724703d8b7e65146a37062cb53b66df0ec8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ040500022 — a six-check JSON result.
Cavalleria rusticana: "Dite, mamma Lucia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4be431e8d42b232e9a06c821e357b5cb19f8fb2b8ddd252326a1730fb646f13. 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/ITZ040500023 — a six-check JSON result.
Cavalleria rusticana: "Il cavallo scalpita"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e673d4ff8e6cbcd3fbdced8babe6877b1ab98f167f0b4a6e26706a5d624397. 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/ITZ040500024 — a six-check JSON result.
Cavalleria rusticana: "Beato voi, compar Alfio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2994f913aae59447c7ddac23272a5bb7ac732152fdca1ae40ae9edb2d8d8de3. 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/ITZ040500025 — a six-check JSON result.
Cavalleria rusticana: "Regina coeli, laetare"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b306652eb234f8291d4d96ff5fe4175ce6c55376edf0436fa2c5fdd1441c96. 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/ITZ040500026 — a six-check JSON result.
Cavalleria rusticana: "Inneggiamo, il Signor non è morto" (Preghiera)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c0492c15757505d0080c9bc73ccc504ee07adb17cb7916ae1142f122f892c4. 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/ITZ040500027 — a six-check JSON result.
Cavalleria rusticana: "Voi lo sapete, o mama" (Romanza)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46de80d24e838b57a07b83002af2aa1831bbdc55fd44966044615e75f360170. 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/ITZ040500028 — a six-check JSON result.
Cavalleria rusticana: "Tu qui, Santuzza?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66e8c15ff697065afb9fc8d2d6154e04f1fb9b04a00f404785b30322f9dfeda. 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/ITZ040500029 — a six-check JSON result.
Cavalleria rusticana: "Fior di giaggiolo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf414b6a21a0c424f5d1b4d91be5f35116b501fccff9b49dbd746f5c56c7af71. 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/ITZ040500030 — a six-check JSON result.
Cavalleria rusticana: "Turiddu, è passato Alfio?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde14ec0de08e90695cb3bf2d5cac38b70cf4330c5d3c4ffa292c0141097bc674. 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/ITZ040500031 — a six-check JSON result.
Cavalleria rusticana: "Ah! lo vedi, che hai tu detto?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f4d7084af39454b454ff23093d00461c0bf6001843a3fe058f75ae61a634be. 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/ITZ040500032 — a six-check JSON result.
Cavalleria rusticana: "No, no, Turiddu, rimani"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7272f6a55676a1ac7f2cf8ff2c768a7b6abc231ce05e3f765891ff4f1ee8e7e4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ040500033 — a six-check JSON result.
Cavalleria rusticana: "Oh! Il Signore vi manda" (Duetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0622ea5a13ab8565b1ba183c0b400c647bdba39363140b832899c4efd6044e. 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/ITZ040500034 — a six-check JSON result.
Cavalleria rusticana: "Turridu mi tolse l'onore"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659fad82cc913ee0e47649c4fe1a30b0f7ac4689c8d81e563d8e951ef467364e. 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/ITZ040500035 — a six-check JSON result.
Cavalleria rusticana: Intermezzo sinfonico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f140456c93ca3892d5da62a7ef8020407df7b5f03df64e5892afc9d64eae91. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ITZ040500036 — a six-check JSON result.
Cavalleria rusticana: "A casa, a casa amici ...Comare Lola"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1edefbe5d0ee5db76f8b76a5db3be73017a0e1f75ea834e44a52548d676237. 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/ITZ040500037 — a six-check JSON result.
Cavalleria rusticana: Intanto amici qua – Brindisi. Viva il vino spumeggiante "Drinking Song"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ecc318505a9ea863f63f51767d0464ca44f1b107f1e6d7467baa56ffcd903d. 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/ITZ040500038 — a six-check JSON result.
Cavalleria rusticana: "A voi tutti salute!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d9e4f0eb7ebefcd113fcdd2232f941b24cac32f89449ae421f5ce2b7bf726f. 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/ITZ040500039 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697c68b291b2d8f9bcd2c0f50090392a64ca0f149b210db2b2e058c8d0d87cd5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ040500040 — a six-check JSON result.
Cavalleria rusticana: "Mamma, quel vino è generoso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f179800ad27d68adc4747c34a3a4e85d82b30742f80acd509c2886976c5900. 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/ITZ040500041 — a six-check JSON result.
Cavalleria rusticana: "Turridu? Che vuoi dire?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59e74fd9b512d8a05fc4487618a32e742a0629c558cbbf9f001f886a01a5ba8. 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/ITZ040500042 — a six-check JSON result.
10. Festliche Operngala für die Deutsche AIDS-Stiftung