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 0xe6b244abdbe52aed981336aeecf7293cb9debe192a60bb2976a574ba4b18081b. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c71498d-2b95-421c-84fa-9df376bc8a30.json and https://artists.proofprofile.net/proofs/artist/4c71498d-2b95-421c-84fa-9df376bc8a30.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Joculatores Upsalienses: Woods, Women and Wine
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 0x5b86f9d39bbf2e6e610adc908b5f73d86fed13f94f190df22c17d39f49e33e17. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/SEAEB9020010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a4d02b9583e35f774436e8b4bee0f00b1dd4f83432ff9cbbcaa3cfea83adf2. 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/SEAEB9020020 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4c5d89c6907f67e65bfe3043028f8ac280a0fafe5d28fcf5e2c8ba92e930ef. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEAEB9020050 — a six-check JSON result.
Piae Cantiones (1582): Scribere proposui de contemtu mundano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3969dca27de1d8e65d57c9b656a5d6c4aee400236539c4d43aaad859481db6. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/SEAEB9020080 — a six-check JSON result.
Piae Cantiones (1582): In stadio laboris currunt omnes socii
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5d1dacfef821625f55c25b4b1faffa26eab326bfb62ae4d6c90c0057b5ab21. 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/SEAEB9020090 — a six-check JSON result.
Piae Cantiones (1582): In vernali tempore ortu laetabundo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84891e17eb2d58463f0729a333582c9014a789defcd63d5185aea2679c6cee7e. 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/SEAEB9020100 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602edd41e96c0f5eaee97a351593451d5b1ded4aca07e8ef299be987d0fde982. 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/SEAEB9020120 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc151835ea9718357e046f6b7313f640d3dc6276d952aa57f3ffdbb150dd95d90. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SEAEB9020130 — a six-check JSON result.
Es fur ein pawr gen holz mit seiner hawen (c. 1450) [arr. S. Berger]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331b8d8c1ad18c4b385a7a16fb46e278ae4cfd34840c5a69ed900dacaeddf6a3. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/SEAEB9020150 — a six-check JSON result.
Vesame y abracame (Cancionero de Upsala, 1556): Vesame y abracame [Cancionero de Upsala, 1556]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67891e83b920593bc8c2cb6f0adb3143c45ab7cf5adcc876d5489179f64a9c22. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/SEAEB9020160 — a six-check JSON result.
Falalalan (Cancionero de Upsala, 1556): Falalalan [Cancionero de Upsala, 1556]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e7e421dea78d7c2ec036138e6986491e91de22d5e7b76e5f981a85914d7e88. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/SEAEB9020180 — a six-check JSON result.
La quinte estampie reale (c. 1200) [arr. S. Berger]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c650568a24fdef721634c517561a2c1e2defba772260b7b670e9ab56e54ec7e. 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/SEAEB9020190 — a six-check JSON result.
Under der linden an der heide (Arr. S. Berger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bab32d9bd22fddd71e2cf76f70bb8db70ca74c01130be6a0e2f4c089924eb9. 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/SEAEB9020200 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1172747fb96bb4f671f44d14674a34452a620d7875e3bdde8c7f6fb99b6c2ea3. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/SEAEB9020230 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f322fdcda89da2bd79b01ef2bfc1ca6a3a1e21c3599d5b67091da9e9049a16. 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/SEAEB9020250 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850138089e7efd9695021341568fb091d86d6e99fa5b0f4ac7bdd4f900507a20. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SEAEB9020310 — a six-check JSON result.
Joculatores Upsalienses: Four Seasons (The)
Ecco la primavera: Ballata: Ecco la primavera (Arr. S. Berger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c32d048b13484a554b4b866ec7e269e136822f6e9af7d794a2883b1effc3028. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9075010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53fe66c25cf53d0519c76cfc30349e49307cf885e738204ae4c2c9df6d0be51. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9075080 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bc55c4c6ff694306f347c6168d139663857a6c21917218679eced7291c5673. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9075100 — a six-check JSON result.
Der ssonnen glantcz (Glogauer Liederbuch, c. 1480)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467799f5119ddf92b44ee6538f268290e00874c8edc2d50b04819e34a19fb263. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9075130 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2354ab1eb8ccea497eb4531b65bcd85dfdd3f3ecaacff20ea5dd9dda1b58c9ba. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/SEAEA9075230 — a six-check JSON result.
Rey aquien Reyes adoran (Cancionero de Upsala, 1556): Rey aquien Reyes adoran [Cancionero de Upsala, 1556]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81cab0a719c3744149b8ef67a2a5de30f24fd4ebe53ce6f1526c08d365dec6e. 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/SEAEA9075310 — a six-check JSON result.
Joculatores Upsalienses: Early Music at Wik
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27cb3faf6dda7c44fc5508786b7c49ac0f3cd431522f4adef23d0fc6afc8953a. 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/SEAEA9003010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22b183ad386aa0768b4c8c9b9333a9bc36020253ff0445d0a189e07d1da61fa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9003020 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd740b8ccf00ea32f2f445c100506189adbfa7f4cd9bfa7d21b34e1474247b2f3. 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/SEAEA9003050 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84feac58779b11bfbb8538516e0840141fa4617159778348584c9efc3cba72b8. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/SEAEA9003060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4edb7f1e0d6ee2d9777e9de2913567cb2645f1aa3dd091d803b856c8847fcf. 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/SEAEA9003070 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a03a64ca80bf6f90563b369742dd75e543afad98a5f98d5cb3b76fd22cd8c9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9003170 — a six-check JSON result.
Rota: Sumer Is icumen in (England, c. 1300)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e0b5e09e0b1756a3e0ecd831617c02551eb05ed79031f080e7132d11762cb7. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/SEAEA9003180 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd55ec81eca51e6df3016270a0a8d5f3d9e88acaa0335301b4bc4ea0a3996fba. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SEAEA9003190 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6f0e7972a038b65ac730e0cf78264bc72c132a3c6a3a9d1a84cc158b480c0e. 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/SEAEA9003210 — a six-check JSON result.
O rosa bella, JD 54: O rosa bella - Quodlibet: O rosa bella (Anonymous) [Glogauer Liederbuch, c. 1480]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2d4e8c9dc1ed8dc3bb894b67feaf42f9c5e9e80a5eae0f7e773ec621242702. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/SEAEA9003230 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fa9c2038fe8bf8a546de2dfbb64cc57a4f380aef8c83bca3a2be83f0429914. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9003260 — a six-check JSON result.
Pase el agoa (Cancionero musical de palacio, c. 1500)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dfdb76c3c9e148e0d8350c55883c87c718c0b68c767ab171161a0466b8154a. 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/SEAEA9003280 — a six-check JSON result.
From Liber leviorum Carminum, Antwerp 1572: Pavane sur la bataille
Evolution of Classical Music: The 16th Century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf8a781c73c1dfa2c1ff1f2ff8d4e2f07fde33a38e8a9b63312d0f4a37fefae. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/SEAEA9003080 — a six-check JSON result.
From Danserye, Antwerp 1551: Basse danse: Entré du fol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6979f5bc84c3c636445eda9e2adec5378869bb713a1af341cdf041a3a8a4a97f. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/SEAEA9003150 — a six-check JSON result.