1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x0326ba13675e47118bab94384f20f26491d52591a4c9115c4010ca10eee6ed82. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4a1c478-a56e-44aa-97f0-6330cea01dee.json and https://artists.proofprofile.net/proofs/artist/a4a1c478-a56e-44aa-97f0-6330cea01dee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem, K. 626: I. Introitus. Requiem aeternam
{"copyright_id":"0x83d1d457ac99104aeb8d38aa7553377110f1d1dd10b42334fb67d3c7966cbd7f","isrc":"DEF058630104","name":"Requiem, K. 626: I. Introitus. Requiem aeternam","registered_at":"2026-06-04T13:50:33Z","spotify_id":"2OUf2NnZZQUhKtpvBWTqnP","type":"track"}
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. GET OTSBitcoinBlockVerifyURL → block OTSBitcoinBlock must exist at that height 3. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 4. GET OTSVerificationAPI → pre-computed 6-check result from server 5. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d1d457ac99104aeb8d38aa7553377110f1d1dd10b42334fb67d3c7966cbd7f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2OUf2NnZZQUhKtpvBWTqnP.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2OUf2NnZZQUhKtpvBWTqnP.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682bd59e4013a4895de1a3abd996c01c87933a5a0bdc9d1948771d16f200fda4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4L82yYYKNIedsvdGBk45d5.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/4L82yYYKNIedsvdGBk45d5.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b9bf176cc23818b11ed468e92e75941012afad495177bc26370ba2cf1d916c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/67kZlVD8tuQQ6Zx4erA9Jm.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/67kZlVD8tuQQ6Zx4erA9Jm.
{"copyright_id":"0x1bb14438d8c7bc125f27c0ea01eddd150558bed0f683dad70ecf8b339b31bbf4","isrc":"DEF058630107","name":"Requiem, K. 626: IIIb. Tuba mirum","registered_at":"2026-06-05T16:13:22Z","spotify_id":"0oUH2JaFcMZCnOjNr4Hzmc","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb14438d8c7bc125f27c0ea01eddd150558bed0f683dad70ecf8b339b31bbf4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/0oUH2JaFcMZCnOjNr4Hzmc.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/0oUH2JaFcMZCnOjNr4Hzmc.
{"copyright_id":"0x9b65b710cc4a5884c1b34af4be18c9c5cd2d856c16a3e98c22945c1fe1ac2515","isrc":"DEF058630108","name":"Requiem, K. 626: IIIc. Rex tremendae","registered_at":"2026-06-05T12:00:33Z","spotify_id":"54Z09Vg82QaZmfRptgJTCt","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b65b710cc4a5884c1b34af4be18c9c5cd2d856c16a3e98c22945c1fe1ac2515. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/54Z09Vg82QaZmfRptgJTCt.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/54Z09Vg82QaZmfRptgJTCt.
{"copyright_id":"0xdac7a428159e545bd98d65092e62c37a7b1ece8e99b2e43c9c493fe0c2a48cfa","isrc":"DEF058630109","name":"Requiem, K. 626: IIId. Recordare","registered_at":"2026-06-06T03:23:59Z","spotify_id":"6RfmeUuo1eGtVpwR6koSk2","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac7a428159e545bd98d65092e62c37a7b1ece8e99b2e43c9c493fe0c2a48cfa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6RfmeUuo1eGtVpwR6koSk2.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/6RfmeUuo1eGtVpwR6koSk2.
{"copyright_id":"0x91653f59e15ab8fe50da78f11987e85d89b5e073dd0a25d792519d88c208a9ee","isrc":"DEF058630103","name":"Requiem, K. 626: IIIe. Confutatis","registered_at":"2026-06-05T16:17:20Z","spotify_id":"3ELgtgCcgucSsQfWqjF6tO","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91653f59e15ab8fe50da78f11987e85d89b5e073dd0a25d792519d88c208a9ee. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3ELgtgCcgucSsQfWqjF6tO.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3ELgtgCcgucSsQfWqjF6tO.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249ca33eb36e246c9f6ba981503d619fb023cfd4d07da0713a539755f4b59121. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/0oo0S7irGDedjjQU67YXCR.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/0oo0S7irGDedjjQU67YXCR.
{"copyright_id":"0xa5679893cfff0f1f863f2d9752ca05f09a85c4c9e5f55c6d5086a1bc6a3ad826","isrc":"DEF058630110","name":"Requiem, K. 626: IVa. Domine Jesu","registered_at":"2026-06-05T16:16:01Z","spotify_id":"6WzVqEJYk6gtFRQBJqzasH","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5679893cfff0f1f863f2d9752ca05f09a85c4c9e5f55c6d5086a1bc6a3ad826. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6WzVqEJYk6gtFRQBJqzasH.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/6WzVqEJYk6gtFRQBJqzasH.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b3c105dc94bb825ec5b3285456dbb2de3c40d337e75812e50a7f4d2332402f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/0VMVQZ9BIjsRSg3HCr6szL.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/0VMVQZ9BIjsRSg3HCr6szL.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095e8358c3bd29b2fa29e648dea4d6c3e57937601a56ad74b45b80ccbb4f85db. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2oW25BwIFCTJ27LgR1P74l.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2oW25BwIFCTJ27LgR1P74l.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e08980da51235c75241154f8448b33e10be2fa021866682fd193f534d972fd0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/4UzMxGDNwRlcgLZ38t0HbH.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/4UzMxGDNwRlcgLZ38t0HbH.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e66e89c18eef9040bd503792adb8c38a298b8957b988344c336ec862c3f763e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2UTWPkmw2PlZhEDeFVedvG.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2UTWPkmw2PlZhEDeFVedvG.
Requiem, K. 626: VIII. Communio. Lux aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1d8e0e678b38c9f11c49e6863376ab191495d25e250422a27ea3865cec321e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2RggUXvNgR9n13vDVIor3G.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2RggUXvNgR9n13vDVIor3G.
Turandot: Act I, "Perche tarda la luna?"
Turandot: Act II, "Gloria al vincitore!"
Turandot: Act II, "Tre enigma m'hai proposto!"
Turandot: Act III, "Cosi comanda Turandot!"
Turandot: Act III, "Tu che guardi le stelle"
Turandot: Act III, "Principessa! Divina!"
Turandot: Act III, "Tanto amore segreto"
Turandot: Act I, "Ah! Per l'ultima volta"
Turandot: Act III, "Tu che di gel sei cinta"
Turandot: Act III, "Principessa di morte!"
Turandot: Act II, "Ho una casa nel Honan"
Turandot: Act III, "Che e mai de me...perduta!"
Turandot: Act II, "O mondo, pieno di pazzi innamorati"
Turandot: Act II, "Non v'e in China, per nostra fortuna"
Turandot: Act II, "Un giuramento atroce mi costinge"
Don Giovanni, K. 527, Act I: No. 1, Notte e giorno faticar
{"copyright_id":"0x1d77deba649d75a4df109cf52a871c20241b2e0267e7cd7346ae0e66ff3392e8","isrc":"DEF058530418","name":"Don Giovanni, K. 527, Act I: No. 1, Notte e giorno faticar","registered_at":"2026-06-08T04:10:31Z","spotify_id":"3TITpsF4ve1oVEFGl9sKIf","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d77deba649d75a4df109cf52a871c20241b2e0267e7cd7346ae0e66ff3392e8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3TITpsF4ve1oVEFGl9sKIf.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3TITpsF4ve1oVEFGl9sKIf.