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 0xff14e0b2afcb54efc89a6271c9177f041252df8b69f0711730f8aeb760b360e5. 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/50b13757-d0ea-48fc-a97e-752e7f4900f4.json and https://artists.proofprofile.net/proofs/artist/50b13757-d0ea-48fc-a97e-752e7f4900f4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xa0b26b78fb9e0d60347d8ddc6fe669fbd8e48a6c4d6470dc128ca6f7b5dd143f. 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/GBAYC9004271 — a six-check JSON result.
Symphoniae sacrae II (1615): In ecclesiis a 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3422d675cb56b4ba9f395946e0c5533d65262877432b681db46932493f7125. 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/GBAYC9002134 — a six-check JSON result.
Sacrae symphoniae: Sonata pian e forte alla quarta bassa, a 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd7964dd314385b401736d41408077cc856b82d921f649bff20aa6e01fd9e24. 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/GBAYC9004282 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f66abf14f3f1e014debff0a44d5debda851069abe8b3c48be4ae6aac767b0a. 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/GBAYC9004277 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80848c2589e1163f2a30d71aea709ba4de2fe14799efa3828ef25eef2bc4677. 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/GBAYC9004273 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e001732943d3bbf7e2b7efa2a8673903b889660402fa68d7ea23548be83d30d. 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/GBAYC9002143 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34f553d95e968402f42e8957afac7e5697089b2245804d6371a9fdf7a24bd61. 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/GBAYC9002149 — a six-check JSON result.
Vivaldi: Gloria in D Major, RV 589: I. Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8787e92513b95813a20c0e1d2e8448316c30a737d73468cd5cb3e3f9b1ef13. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAYC9200663 — a six-check JSON result.
Handel: Laudate pueri Dominum, HWV 237: I. Laudate pueri Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf361629483ab6cd051c6a731430cbb7fd9993e64d2b4aad7342589a057d9e205. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8701576 — a six-check JSON result.
Vivaldi: Magnificat in G Minor, RV 610b: III. Et misericordia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a7774ce812f8932958c463d563701cc35aabea7efda586f025507f6f99c207. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBAYC9200678 — a six-check JSON result.
Handel: Messiah, HWV 56, Pt. 2, Scene 7: Chorus. "Hallelujah"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882dc4a47b520d3eebe503dd2988204e9a97c883694176a02b184c4767d6851e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAYC8900094 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8787e92513b95813a20c0e1d2e8448316c30a737d73468cd5cb3e3f9b1ef13. 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/GBAYC9200663 — a six-check JSON result.
Vivaldi: Magnificat in G Minor, RV 610b: IV. Fecit potentiam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb02f3dfa2378292f6aefb6a3655ff59cdccd41b58f635043ad5a3ce4fc09d5. 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/GBAYC9200679 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e067a26c98d3f3655bcbd8e1e698067ac8820f39a00c38ac1f287dfea88b85. 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/GBAYC8601755 — a six-check JSON result.
Vivaldi: Gloria in D Major, RV 589: II. Et in terra pax hominibus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa561ce141e4729ca12073a943fc7bd6fa1a01d10e3d8d2cc0e32d1716abe75f2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9200664 — a six-check JSON result.
Vivaldi: Gloria in D Major, RV 589: VII. Dominie Fili Unigenite
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0ae03e829a1e0f3e39c3e813042db09d5eab947304902124d462a3acef8f61. 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/GBAYC9200669 — a six-check JSON result.
Vivaldi: Magnificat in G Minor, RV 610b: I. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98399926c12c3c7e1f51c9bb3cdb057b84012a909f991caa259eb5ee77b4427e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBAYC9200676 — a six-check JSON result.
Vivaldi: Magnificat in G Minor, RV 610b: II. Et exsultavit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0658be3fa075d1b53699fdc307582b9b5cc03eae4efc0330f61395a0a3777137. 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/GBAYC9200677 — a six-check JSON result.
Messiah HWV56, Part 2: Hallelujah (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882dc4a47b520d3eebe503dd2988204e9a97c883694176a02b184c4767d6851e. 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/GBAYC8900094 — a six-check JSON result.
Carmelite Vespers (1707) - (Second Vespers of the Feast of Our Lady of Mount Carmel, Psalm I: Dixit Dominus: Dixit Dominus Domino meo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c437059dd633b6df6993656c372a614aaf75716424ba30fe0baee1bc312453c. 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/GBAYC8701565 — a six-check JSON result.
Gloria in D major, RV 589: Gloria in excelsis Deo (choeur)
Vivaldi: Gloria in D Major, RV 589: V. Propter magnam gloriam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc460915f53c7029ddfb7d4c8e30affee8b1039119113ac8dbf6b2baa0b1789bc. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/GBAYC9200667 — a six-check JSON result.
Vivaldi: Gloria in D Major, RV 589: XII. Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39dbf002fa608dc1a9423ea4c427622e2d0cf1fc7b7aa405f308579cfa36bad7. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/GBAYC9200674 — a six-check JSON result.
Vivaldi: Magnificat in G Minor, RV 610b: VII. Sicut locutus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56a4b99152610c81b2d9467a5be5b9262a405d821242cd80ccdd71b995d06b4. 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/GBAYC9200682 — a six-check JSON result.
Vivaldi: Magnificat in G Minor, RV 610b: VIII. Gloria Patri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe832d62907c6768818e7ede34f9aac04f66e9b58e0a8080ef66193383ce8e6ad. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GBAYC9200683 — a six-check JSON result.