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 0xc27fb0b1e89f8ce358c4d3bdd36e345538dfc0cc0e0a3a7f77edad0de751541c. Chain 2 (Bitcoin): anchored in block 953879 (2026-06-16T02:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09923c36-b032-412a-ad63-7d7ed16b1fba.json and https://artists.proofprofile.net/proofs/artist/09923c36-b032-412a-ad63-7d7ed16b1fba.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Carl Michael Bellman (1740-1795): Sånger och Epistlar / Songs and Epistles
Fredmans epistlar: No. 41. Mollberg satt i paulun (arr. F. Akerstrom, K. Fritzen and O. Larson)
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 0x2962cb2095b259a2169c9ac3b158444e25b8f8fc66a23a93c62eadbb8aacfde7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USB8U1041721 — a six-check JSON result.
Fredmans epistlar: No. 72. Glimmande nymf (arr. F. Akerstrom, K. Fritzen and O. Larson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957cde1c835792e1258bb7659a5e0d99a49cb516270c12b1461d3c9c3318b816. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1041743 — a six-check JSON result.
Fredmans sanger: No. 64. Fjariln vingad (arr. M. Bergstrom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070144e4398539e81e58eb40df29b1fbeaf165fbe824bc4633a358b05c572cf3. 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/USB8U1041723 — a six-check JSON result.
Fredmans sanger: No. 21. Sa lunka vi sa smaningom
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1082e354d16931a28a8f03caf11480ad882eb6fb76c6449dededf397b7e3bf26. 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/USB8U1041745 — a six-check JSON result.
Fredmans epistlar: No. 3. Fader Berg i hornet stoter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874da3c18ad5424687d5ec1e514a51d38cc846e3315ad4b380a7599348e177ad. 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/USB8U1041727 — a six-check JSON result.
Fredmans epistlar: No. 24. Kara syster mig nu lyster (arr. B.J. Lindh)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b77de82f77b173d151de94fc26fe6b6dcd62e2b91c466fff99e327d84a8abb. 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/USB8U1041728 — a six-check JSON result.
Fredmans epistlar: No. 5. Kare Broder, sa latom oss supa i frid (arr. M. Bergstrom and M. Sameulson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6338994f4c046546e326dfb28f6ee2228971031a4eb5b4d2e170e1c793577e. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USB8U1041729 — a six-check JSON result.
Fredmans epistlar: No. 12. Grat fader Berg och spela (arr. F. Akerstrom, K. Fritzen and O. Larson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1ede46295411619f93b72d5ff7c7fe03816e083f9dad55f4ffadd3bb43257f. 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/USB8U1041730 — a six-check JSON result.
Bellmans skrifter: No. 14. Herr Bacchus han ar en riddare bald (arr. M. Bergstrom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a6e9147201adfdb755e2214e685b4199aef2f05c9b7eb0476b53388078fbb8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USB8U1041734 — a six-check JSON result.
Fredmans epistlar: No. 81. Mark hur var skugga (arr. B.J. Lindh)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0bfa5d48c9a876dba4e004d7b40218e69f6c1a25006920af7ca9c004b6c6e8c. 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/USB8U1041755 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598f638d9de587d12ec3d2f7189e9c03d06f4c6ce9e2ce62e793189b1d9df310. 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/USB8U1041735 — a six-check JSON result.
Bellmans skrifter: No. 10. Bellmans vaggvisa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64414a544b9a1165c1d5d8fcf8c145c655e143afd9cf340d157492fe22c9bc48. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1041756 — a six-check JSON result.
Fredmans epistlar: No. 23. Ack du min moder (arr. F. Akerstrom, K. Fritzen and O. Larson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35319dd588c568c0649c3f8ef71464dfae856bf9ab8da354bf91e975df768f50. 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/USB8U1041738 — a six-check JSON result.
William Clauson sjunger Carl Mikael Bellman
Fredmans epistlar: Nr 10: Systrar hören min musik
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903643fa72302362f6ebc63f4189e5c06e86093fb22e8659d182a36c6343cde2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350501 — a six-check JSON result.
Fredmans epistlar: Nr 2: Nå skrufva fiolen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18da685b17ccbcc7fa8d8a5ee6ddce22206b2030d49b59de32ed993ddb1a2c8e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350502 — a six-check JSON result.
Fredmans sånger: Nr 38: En Potipharns hustru med sköna maner
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9222da388861bb0d9282c0f4cfb82051c658f63a1069f83baf0a0fc33d4c3f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf823dff6a868e4320fe69ae7da2c7655a321093d8a091436487452f2bc3fb80c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350504 — a six-check JSON result.
Fredmans sånger: Nr 16: Är jag född så vil jag lefva
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc960b60c555dedb60e4c77f355d69175f7f3a3b0ed5ef9195eae12c345d8789. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350505 — a six-check JSON result.
Fredmans sånger: Nr 10: Supa klockan över tolv
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c7a213df1f2e1561cff0f2d1ac8b62a506023f88f22afac74acf91ededadf2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350506 — a six-check JSON result.
Fredmans sånger: Nr 9: Nå ödmjukaste tjänare
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753aa0fe0d05159400c4de368ef3bd5abf22177f07a5414dbc60b9c99588dae9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350507 — a six-check JSON result.
Fredmans epistlar: Nr 39: Storm och böljor tystna re'n
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f7b88a5a48f0df9015f714db0aecf312d6721d2bc7ebee93bc7234c486d8ba. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350508 — a six-check JSON result.
Fredmans sånger: Nr 56: När jag har en plåt att dricka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6128dfc7538143236d4eb47e66b315b3ceddaad142c9eb43d6d9e0a58f345568. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350509 — a six-check JSON result.
Fredmans epistlar: Nr 71: Ulla, min Ulla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d81df4ec0989ad681d9f8b7dac42094946ae3da8fe7b427a785c124a259e09. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350510 — a six-check JSON result.
Fredmans sånger: Nr 64: Fjäriln vingad syns på Haga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a9d137903c4b65a0ac148cbc407b3643300586de217bfef8668b9956b553a3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350511 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df379a9b896fc671b54149f5cdf9153ff3af32de2e2b284ba1ceb073a0d0e69. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350512 — a six-check JSON result.
Bacchi Ordenskapitel XIV: Böljan sig mindre ror
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872f8262453f16a7844fa7c38572ec2b5382eefef9addead70e1d8074bbf5f58. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350513 — a six-check JSON result.
Fredmans sånger: Nr 11: Portugal, Spanjen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd293bb6a58453899dd321a2208cbcc135a8f48f9ac4c4c4896f25818bb8fe87. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEVOZ1350514 — a six-check JSON result.