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 0x6fad1425d320b396d63c3cdb18478b11ea7f170d61c3f2eb2d75b3532df168e3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38e8699d-56a5-47ab-965a-9c76e09b840d.json and https://artists.proofprofile.net/proofs/artist/38e8699d-56a5-47ab-965a-9c76e09b840d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
"And Then I Was in Time Again", Viola Concerto: I. Allegro, quasi recitando
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 0x4afe0efb08fb6bba15264b9f1efed5a1c1b90fc59a79c7a0a96292a8de230020. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEB330185001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40ba20f0375a22dd7d95d4c396ae9fd31ecaed2236a41923f167c166ea13c9a. 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/DEB330285101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f0b0ce8e6fdeb527dc43e84767ccfb1b74fc76e4b1ebef965e9c26670e88f8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEB339559201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59409d88e9633907a7d043f0e112646f5673fcd06fc6cd87140a89ec021c1011. 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/DEB339559202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965ad243a0219fad11231a010e5763374c0819ff81d1d9fdc0dd56df1bc004c4. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/DEB339559203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ece0cc10b6a912c2da7add3da3ff2a9c832423f10282d5976baf0477c8d751. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB339353301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5886fbf5aa5eabbd5f5539696289a6ddd50905c24d3bcfbf8c9ce868223a8d9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEB339353302.
Collage sur B-A-C-H: I. Toccata: Preciso [Quarter Note = 120]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0bdcef1fc1f1364ad8e755556aa0ef6c99bcdd84aa7211bdd1694311fb8e5f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DELW71731901.
7 Magnificat Antiphons: No. 1. O Weisheit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc523f17f7bc95ea2d694ef0fc59444a123a17f4f42044990139ed50c46bd9b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DELW71731904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b2577eb2eaec89b5c349c3b6a770297488c6d5f2d654014ce2c505424a74d7. 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/DELW71731905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecd1122429c9e71f45b868978bf1a25346f44b18424b808df6f88fe041f637b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DELW71731906.
7 Magnificat Antiphons: No. 4. O Schlüssel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8934e99703d8474b031b772de0f4040f1f2b56589dd845a580ee15b76f6839a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DELW71731907.
7 Magnificat Antiphons: No. 5. O Morgenstern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce186f3190d51237cae69fffed3dfc7cb62bd95a2392066dbd0ed5fa10a48ec4. 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/DELW71731908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb67a2e0fda845db484133f67e7cd238e1dfa2351c98522d166394a79392dbd. 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/DELW71731909.
7 Magnificat Antiphons: No. 7. O Immanuel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4f50dd628dcc280b4136e4f43b86a1c9eff083e3efc5300026a72439eda90a. 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/DELW71731910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f09888c8d1d6acf38625a55eb337543085330d8d2dc261b7262360de4dce76. 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/DELW71731911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db0f3173c44b221a6841401dbd22b716734ae985bb939b32e4806778ce23630. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DELW71731912.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 1, Vergine bella
Palestrina - Twilight of the Italian Renaissance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d398cdb18c66854c6689404c3674ceb0c9e0d83ebb0a6ddb2a7a0b335d24190. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBAYC8401313.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 2, Vergine saggia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53543d9691d453212f25f5323429fc4cab1be17abab5ca189547664f34382fc3. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8401314.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 3, Vergine pura
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c07a4d507e84651b2d04eede30c051ea7a1c6c3ac2e6b01502c556c4f3e29b. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8401315.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 4, Vergine santa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc567e14133a898f82c28705a135b6a21eb6b328cff17988fe524b0b3c48648ed. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8401316.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 5, Vergine sola
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442446f39047b9fffa2c9a8277f15ccf017e6956ad68c2ff4799c2fd50e0f257. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBAYC8401317.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 6, Vergine chiara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293a69585560898d6dbfee590f2844e570538ebad1cf6ca320a480472c510fb3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBAYC8401318.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 7, Vergine quante lagrime
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f008b3388c6fbb6066cea5c20f71f58bbf4bf400a574274a2efd895649c9c3. 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/GBAYC8401319.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 8, Vergine tale è terra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa827d87022ba5b47dd1c29232005457612b707c3173fa7d67732571416b84986. 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/GBAYC8401320.
Mater ora filium (Sacred Music in 14th-c. England): Mater ora filium (Sacred Music in 14th-c. England)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdb092050db46ae5c376acb972bbae4f553b691bde16262fb6ded022cc0e49c. 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/FRZ148409130.
Anchor che col partire (Italian Madrigal): Anchor che col partire (Italian Madrigal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c522542ceed273b5cba947e589e43465561849b1ace90b2dd5f9f5b820eedf. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ148216130.