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 0x408e9d423b59d1441b1cf519bf15791576f54359beeee2bfb009b6ce32bab26b. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ff7b34a-2b22-4234-87f7-2a02954bf27f.json and https://artists.proofprofile.net/proofs/artist/0ff7b34a-2b22-4234-87f7-2a02954bf27f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Herbert von Karajan conducts Franz SchubertLive Recording Paris 9 April 1962
Vierter Besuch - Unter den Schülern des Porpora
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 0x806f5d39582c71d94231adff794856815600eb08d973bd5c641daf27bf6ae711. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/DEQG42511121.
Vierter Besuch - Haydn erzählte der Mutter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e4e7eccbd2bd1acfa480b185436d5dad111c38a648343cc6de9ae669f6ecc1. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DEQG42511124.
Vierter Besuch - Auch hatte er seine Gründe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c55435928de344724c5877d383d215e6406ecfddc942b2daa9acfe7a25c41a1. 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/DEQG42511127.
Vierter Besuch - Sobald Haydn's musikalische Produkte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb177924ffbf6e42b328b4202ff6559c7c273bdbf59ec2c378ff5ed7b9191a4f7. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEQG42511130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7129019c3cee461f6adb082d7834609925ee616a275bae0835b9b8eb1744d993. 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/DEQG42511133.
Vierter Besuch - Haydn vermehrte seine Bibliothek
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e287e4654115f1b8bfa30fa47466ed331d4c3f25cc9141ba3bf60f668e12684. 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/DEQG42511134.
Vierter Besuch - Alles musste auf die Tonkunst Bezug haben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c66ab8c1403d921a81ab7f6d5604ded66a42ef4fd2481ac7fd7bf10a9741496. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEQG42511135.
Vierter Besuch - Es ist sehr natürlich, dass in einem an Italien grenzenden Staate die italienische Oper blühte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10a79ab2bf32c23a22b03ab8371388a5238bea06731cc6426fcfffd89b00048. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/DEQG42511136.
Dritter Besuch - Mein ehutiger Besuch war fruchtlos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa388c5db230f2c1193c26eb7c75bf2e4c519dab13d30f01a74482ebe10d0b3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEQG42511119.
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 0x9b5e6466075940b5ac0870859e2f3fea4d96417dfb95be1e1b66b0bf463f7891. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEQG42511120.
Vierter Besuch - Da Porpora das Mädchen im Singen unterrichtete
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8299b65b73140572f3201e3fd68f714dccfbc81123c632961c200f845c721a. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/DEQG42511122.
Vierter Besuch - Haydn's Schicksal schien nun eine freundlichere Wendung zu nehmen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c76cf5fba063cebe750eda696ffe6a3164d38b4576138317533d6ccded1b8b8. 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/DEQG42511123.
Vierter Besuch - Haydn's Wunsch kam bald zur Wirklichkeit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f47c0a39b97457b30f7761ad6560c2b07fbcd1c25ade6aeee8f7152de8c6a5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEQG42511125.
Vierter Besuch - Haydn sah die Verbesserung seiner Lage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3db4336d5d19225bfdb546fcfe162735f98321471c4b3f8cde1d9f706222fb. 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/DEQG42511126.
Vierter Besuch - der Buchhändler nannte Carl Philipp emanuel bach's Schriften
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28f14d6208732f115f440778e137d3140c6d411bdcb8cb8237e6ccedc28739d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEQG42511128.
Vierter Besuch - Er schrieb im neunzehnten Jahre seines Alters Quartetten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e07169543f8ca3ad69d48f5e96078a88e0686cfa26bcc0664ad96d4e706e5b. 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/DEQG42511129.
Vierter Besuch - Aber diese Art des Verfahrens ist nicht empfehlenswürdig
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5822a5471a780a58028a892fe5e9b534e3380c2dfe574c9d4477cd5a385c75d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEQG42511131.
Vierter Besuch - Weit entfernt jedoch Kirnberger's Schriften im Allgemeinen zu tadeln
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bcaa3ef7486880d57e7b682c8656577d3c566be22d5b5c9608a0f04eabf404. 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/DEQG42511132.
Vierter Besuch - Es ist daher nicht zu wundern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0102973cedd12b9a9e6347cf040101e6bdf76a68c9a69e902db4ddac90ed17ca. 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/DEQG42511137.