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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244122c9251224d9f62f49135e9e2edad018425e79bf299329d5ec4e4a91ea54. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9393dc5-aa2a-4524-bef2-f1555e9de9f0.json and https://artists.proofprofile.net/proofs/artist/a9393dc5-aa2a-4524-bef2-f1555e9de9f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ein Feste Burg ist unser Gott BWV 80: Aria and Chorale: Alles, was von Gott geboren - Mit unser Macht
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957fbb09f2008b603441546b5b119aeb964d01367f5b68789c47d64a792c596c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600272.
Ein Feste Burg ist unser Gott BWV 80: Chorale: Das Wort, sie sollen lassen stahn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922bbc88e102146478dcb28ecbc6e1f8fad925d53661f302dbed6ce64bdcb594. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLK170600278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87bca6f75b209e1a86e0a8590991cc732056b84ff00372c7f28ccbe306946e2f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLK170600280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f363c1676d9377920e380787cb49bef193ed9d3ae8852ac90a2166707ccf0ef. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bb4b6b09a52e4cc7753fe107e5d02f521cb7ca0ac6e69cd04aae5b8427d4a9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c443e666547b9f71d63f5575cd037469711de162477b2757fd0df8ec38eeb7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a879ab7bde5d43c96a26da6fff6c03b2bf4af076381858d0d17833cbcf8aa72. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7477cb1983d4cbb17614595d2c6acda9fe3ec8154774e231e40839485e1702. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLK170600288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99adf719c14e88bd5e24d67117eca7c474a650c5b9b0d7b69fc655e830b2e27. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600290.
Ein Feste Burg ist unser Gott BWV 80: Chorus : Ein feste Burg ist unser Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac0e4f7c1cc798e285548d4774dd7ab7f73c22aa97510d2918c5299196db9d3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600271.
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
Ein Feste Burg ist unser Gott BWV 80: Recitative: Erwäge doch, Kind Gottes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baf7ab6c41642a76a8af48d9467bae7455034e586718264d5a4f1e6d058d5bd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600273.
Ein Feste Burg ist unser Gott BWV 80: Aria: Komm in mein Herzenshaus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f089f015893ebefd7e8515fbe024fd3b6b89d19e5b332f98eabcf8c9537a61. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600274.
Ein Feste Burg ist unser Gott BWV 80: Chorale: Und wenn die Welt voll Teufel Wär
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcff94690df511136d3cdafb22deaf5435cd83043456881f0e2b3ad5cd2a1713. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600275.
Ein Feste Burg ist unser Gott BWV 80: Aria: Wie selig sind doch die, die Gott im Munde tragen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694246367eb8e22186d144e0833c86a9ba45aaab424e7b9127f652948f7afe17. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf542b2a0678bb9ac172defccdd71f14e0d00b28c9a4d9330c1f597e50d2b6a. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/NLK170600279.
Missa in G, BWV 236: Gratias agimus tibi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdd8f68a21c8f91ecc43029f4f33d8903ffa98691bf6fee4c72989185648353. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600281.
Missa in G, BWV 236: Quoniam tu solus sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9bb721f33ff78e8747b60ff5ea5aca17dc719f07f707676d86a7f1f6efcfff. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088fc44f8c7ec9a244d217384f47eb6b3025349933c0e8d5e5ba2660ff59d0ea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c10513bd3662fa5d48900eafd05f37cc666a5cbdb4ca8731bf97be174eea0f3. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK170600289.