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 0x1373b58154bd0f42b0e137aeaa0fde4b3fda36352fcaabec1fc4077b5e1328a8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71092837-7d29-477a-aeff-f047651248d5.json and https://artists.proofprofile.net/proofs/artist/71092837-7d29-477a-aeff-f047651248d5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
A Choice Collection of Lessons, Suite No. 1 in G Major, Z. 660: I. Prélude
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 0x45eae628254ded1814f3d02425b37a73fc6d493b0777ebf1270ccc557f3d2614. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/PLA161743701 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 1 in G Major, Z. 660: II. Almand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2492ffb034a4e4df4df56020301900617c95311949c36c576268fb42945fa2d. 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/PLA161743702 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 1 in G Major, Z. 660: III. Corant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2037b9b9d7455fedbf550286739a09e4b1592b96ec3b4f4078f94ecad8cea54f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743703 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 1 in G Major, Z. 660: IV. Minuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa751fc68e41392ed1dd3fe5cf5f5f5505c5dd1d20f215e72424c40d46759d72b. 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/PLA161743704 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 2 in G Minor, Z. 661: I. Prélude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb499d31a0837d65ee9a9681f9d415e2376674ba6ba9e7c9175d345460304fe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743705 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 2 in G Minor, Z. 661: II. Almand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50fa8ed916a0504ad7dad55a48dca3866a0e321513a21a8cec0b32def9d1843. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743706 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 2 in G Minor, Z. 661: III. Corant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76096633883ad5c9433b3f4bae2025cdc5c513736257a4f5fb8b590fd8a9b95b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743707 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 2 in G Minor, Z. 661: IV. Saraband
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735f2cbcab72ac321c082323e775dd156fd76dc681579e1c2e9a70a66e378b1e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743708 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 3 in G Major, Z. 662: I. Prélude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03b99a9b0ded98851278e9f7b8734b820ae9653db4d7cdcdc3700ebdd42c2cd. 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/PLA161743709 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 3 in G Major, Z. 662: II. Almand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11cba4e24e2c219f14658832c4a93294e1cf1bf6b2b66fad52065e5a8d9c747b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLA161743710 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 4 in A Minor, Z. 663: I. Prélude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297ca6f263f81ae1529de68d74ae9b17bcc52f1b6e17b7998e43a18b2582c13a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743712 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 4 in A Minor, Z. 663: II. Almand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdeaf6d3a286be4cabb25d7c4481d470a059fafe85e101e54d2a4cb234fc141. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743713 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 4 in A Minor, Z. 663: III. Corant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ffaed288208903b703d439b32fa68f936281c9ac4b4e7844866a228e0e049b. 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/PLA161743714 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 5 in C Major, Z. 666: I. Prélude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe2962f7f631d21f05f1986fb2cba8d73a3e370c163b7cbe05d754c99c517e3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743716 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 5 in C Major, Z. 666: II. Almand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a276e045351671c7e7587fc0108b8b2ecc8949d99dddf81253c554fbe897e81. 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/PLA161743717 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 5 in C Major, Z. 666: III. Corant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c58c486a9698068c578e3e648bcc9170dec8bba0b9861c81e2e1ec6013f60a. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161743718 — a six-check JSON result.
A Choice Collection of Lessons, Suite No. 5 in C Major, Z. 666: IV. Saraband
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e9ec4778f3f5de3eca354ed0265135353e446e5bcaee6c423fa693735f91bf. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/PLA161743719 — a six-check JSON result.