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 0x12acbf16d9849a34b1e304f95a8f12625cb77f76e424bef53fcf2e3d47eb0ad8. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73b3042a-1275-4628-9274-91ec5cfee91e.json and https://artists.proofprofile.net/proofs/artist/73b3042a-1275-4628-9274-91ec5cfee91e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Herr Gott, dich loben wir BWV 16: Aria and Chorus: Laßt uns jauchzen
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 0xa33dd90d45a9dd746205679d417b64905090068d665f4735ed94dca3ff6f1da9. 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/NLK170400118 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc2dee7f639831e8e0c46767a72629621c125b752492f0973b2b830dd699aee. 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/NLK170400002 — a six-check JSON result.
Ich habe genung BWV 82: Aria: Ich habe genung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9533d48322b42604e0d50c9cc652ff1388339b43e79fc43c3fed24e54afada65. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLK170400001 — a six-check JSON result.
Herr, deine Augen sehen nach dem Glauben BWV 102: Chorale: Heut lebst du, heut bekehre dich - Seconda parte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9f0c543de5f5f584456c46d0ebc2d8b45eb9c0175715875d60ad84c157587f. 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/NLK170400133 — a six-check JSON result.
Vergnügte Ruh, beliebte Seelenlust BWV 170
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c21127708dddd915aa5e0e7dda93543cd9e68c467e55536ff9cfcccb1771cdf. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLK170400004 — a six-check JSON result.
Ich habe genung BWV 82: Recitative: Ich habe genung! Mein Trost ist nur allein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705f81836d5959f5250c0bdb5e9272228346ea6266ffe07a8e187313c8f0338c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLK170400108 — a six-check JSON result.
Ich habe genung BWV 82: Aria: Schlummert ein, ihr matten Augen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949501a3651d23b0fbccb27bdca748e0af9d072dd32450ad2bd0fabc96f22de1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLK170400109 — a six-check JSON result.
Ich habe genung BWV 82: Aria: Ich freue mich auf meinen Tod
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3f435b84bfc60b154f8062e7269017b36b86db961d3f959b2977c7d39f9599. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLK170400111 — a six-check JSON result.
Herr Gott, dich loben wir BWV 16: Chorus: Herr Gott, dich loben wir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa8f188d5c2ffd5ee4f0ab049f647cb94d22b77ca9df971ce4a9b42235ea694. 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/NLK170400003 — a six-check JSON result.
Herr, deine Augen sehen nach dem Glauben BWV 102: Chorus: Herr, deine Augen sehen nach dem Glauben - Prima parte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0604e91427e4fafd16a875b04bf29abacdd62ebe96633c28fad6654aa60c2a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NLK170400005 — a six-check JSON result.
Ich habe genung BWV 82: Recitative: Mein Gott! wenn kömmt das schöne: Nun!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9ead915089a9c2eee623b617a9674ffd2a53428252522fbeb923a84036d597. 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/NLK170400110 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2570e369ebf54a0ab10aaf4bd6d2bc20ead636a5c6988ffa03cc54b3ced742. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/NLK170400112 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0110956b6e3f209b88738b628ae7308b4033f7caaade3d848cdbd445794f27b7. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/NLK170400113 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe717aae3b88057906e94a0a541064a76c9d3df2eebe674ad451125e7cf65b042. 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/NLK170400114 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e52089d00e1fd3238724ec95c38d56da768d229537c719328a98dcc3b3cfc2. 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/NLK170400115 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13f1c0f27bf4afff81281f3628c0a93a34b589b660a18bcdd45314dbfbaf089. 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/NLK170400116 — a six-check JSON result.
Herr Gott, dich loben wir BWV 16: Recitative: So stimmen wir bei dieser frohen Zeit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e01c3dd45cb4c14071064704889b985db45a39949e4d0f08e638fd20c330a5. 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/NLK170400117 — a six-check JSON result.
Herr Gott, dich loben wir BWV 16: Recitative: Ach Treuer Hort
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2a9ebc0f58c0d37a0725d2834ff5211e4173006978f1a4b7f5077303db3273. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLK170400119 — a six-check JSON result.
Herr Gott, dich loben wir BWV 16: Aria: Geliebter Jesu, du allein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04317d30e0c94a3d716a02138ea468bb1bd6b723e0c57898eb68255598fdb018. 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/NLK170400120 — a six-check JSON result.
Herr Gott, dich loben wir BWV 16: Chorale: All solch dein Güt wir preisen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19f0b3472137bdcd62b9136f3138b84d607e9d498ddfb0ed177471f6833c4ad. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLK170400121 — a six-check JSON result.