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 0x04b747b0da895d2ed6069a81cb8f41545676050c48d4156f20d89c34e0efac52. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9eb5f762-5c05-406e-b20c-2038210ae503.json and https://artists.proofprofile.net/proofs/artist/9eb5f762-5c05-406e-b20c-2038210ae503.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xd0f81a7fa02e583b2bf9ee5b1432b35b3b0030610b1b821e36d8ac92fc1c5cd2. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/ATB232209012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbc37fbbd8029a3ba4a07cd8cd30c3a625e3d1c5beb3532ef122f803d9df7c6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ATB232209022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9985bb64b955982311a1b5ec2201b4607dae461397b83bea264037575a4f4745. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATB232309012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6570cb7f81e4a73d057615c7918623595e1b8c08d7fc799fb1f6fb4ae76b6db4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ATB231808032.
8 aus 12 oder Von der Freiheit, in Begrenzung Schönheit zu entdecken, Op. 36: Thema - UA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e928f25d31a12682e0d7838c0ff369855e45143d43fc2a5674d4430ac3f60b. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/ATB232500010.
8 aus 12 oder Von der Freiheit, in Begrenzung Schönheit zu entdecken, Op. 36: I. Fläche - Punkt - UA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5578fd0ab99d7a023ac73a7a5157b1b4c0ad7009e31ead16215cd98ed496086. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATB232500020.
8 aus 12 oder Von der Freiheit, in Begrenzung Schönheit zu entdecken, Op. 36: II. Melodie - Begleitung - UA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbb27c74ba46a210f08d5f5f4ca47153fff28bc5ec95a6a75e3ab0087a33072. 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/ATB232500030.
8 aus 12 oder Von der Freiheit, in Begrenzung Schönheit zu entdecken, Op. 36: III. Streicher - Holz - UA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0bf8edcdd8ee1238aca4e301309edc39a3c56be92cacf05e541a187ad932b4. 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/ATB232500040.
8 aus 12 oder Von der Freiheit, in Begrenzung Schönheit zu entdecken, Op. 36: IV. Rhythmus - UA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d77293091e72acad492252118ee3869e4bd8f072a40f677e0b6c3fa0fa3d581. 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/ATB232500050.
Eine Begegnung zweier Viertongruppen - Uraufführung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7c332926e2a80b8768bb7092966fbf8e46d8e47974397c6698261e8f81b9ae. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATB232500061.
Thema und drei Abhandlungen: No. 1. Thema
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92679f2b85818fc3e45216d11984b42ac8c7a7f7d5a7f082732c2743d8bbf299. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATB232500071.
Thema und drei Abhandlungen: No. 2. 1. Abhandlung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef223422ae443e2c05b9ae395a8b9294ea0a7439cecb2d2a90b9992bb280abc. 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/ATB232500081.
Thema und drei Abhandlungen: No. 3. 2. Abhandlung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49628e2e3a8d5786eb32c5d23ea6b33b0d9edf2876ca6ace5e42dcbb6a88036a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATB232500091.
Thema und drei Abhandlungen: No. 4. 3. Abhandlung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425f29b27e27ea1bdedd1c74bf62b325c27968c52c95a4dfe89baa2ce1764922. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ATB232500101.
Thema und drei Abhandlungen: No. 5. Abschluss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a48376e2b81de327c3a5177b95ba96a74a25627d7a74ea9f7f7d32f87efc7e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ATB232500111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1a0e3080fe9b5d8bebce923a40348d85f2b772dc7ccb9f2d24f3281e213213. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ATB231808072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b5f0885e07923dc6803ec1b11b31fac3efe93462c3a15e309562db4ebf4c94. 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/ATB232500131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2330f98f2b3b09c76ef6805a66742e4187d1ed59d1724efc899219b850fa6453. 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/ATB231808042.