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 0xa84d2158f79b8964b1a5ba3417aa50a708421013eacf406f1fa7a5a486ee2abb. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b343a268-9212-4b62-a29c-3b637a8300ac.json and https://artists.proofprofile.net/proofs/artist/b343a268-9212-4b62-a29c-3b637a8300ac.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 0x61d9a81f1ece8c18b028f379fcf2f65af238b6fd3ef11a39fe1b2da1a3245b77. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM82347767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726183df1312391ea54ae40bdb3e3fcedee888ff7c44b750315c12c412fc8eb3. 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/USHM82345917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5472f160041a55febac77b4fed8bae443392b3714892d3e93a2c1408a4d551b5. 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/USHM82337400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18db57d5f0a6907160ed8509c56ebc559c5680b92fee616a43d492eebae22dc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM82337622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dd0090e68a84c6a4c5dd94513022d1a074558835afd32bf949aca78488dd5a. 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/USHM82338355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5485e008378a2c96b8ad0d08cfe6980f54e7d46bb1cc3cddd0c214e034d984. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USHM82338411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eae3b614cd0dfa7e48734d619faf76234acf1165f6d41257fd18499eab4c766. 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/USHM82338336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0885fc2a3389e3748fe035320889c03975469ff7f46120e8f8791c12339b1f. 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/USHM82338414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e7c379db9e29a5167f8cc1ba55695680770194c7c077170eb656b34446c916. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USHM82329662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf076142fd0f088858c52b41f8c96bc31ef0fc0d9c513e994b9e42e1d4eaf8eca. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM82320244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbca311a2be9d7538d33f8def00d4ceaaa0abeb8885092198166ade78ab3b95. 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/USHM82320240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd54e9aeafa2a3851460b92c478bcbfdd3ba49ed7f150e58a328a1fe126067d9. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USHM82320286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde498e7f7664541a5b2f59a50fe6824cd2cb13befdbda5c00dc2aa44e92fb6a5. 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/USHM82318173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062dfcbfc0d6b9568758ea1ad3f1060c68df78673b098abcc990919cda6cadd8. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USHM82318252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c19a29af986bdda77fdc11113cc3764a822de84b740f516f7d5a12216c5489. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM22397787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ba97a6b06905be480d008c1c2cb2745ad3dc5adacc22d442b9e4986dfad8d4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USHM22388740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1afdbef97eac401f9aade485031069e6dfdff64c9c7e46b17972c8e5326081. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZS652336508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc317484055a9620900da3cc771d23bd89dc6b205d4e99a41ad14e6f42464f9. 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/QZS642364582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d757c78cd9e374eb6c0fc5dac0bffbf4b04a4a46dbd087cf245cf035f27694. 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/SE5752321773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cfde3beaf6faa9ecdf09e044182c15fa54f586d6c6f6409d5d1a9fc76bbea7. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGI2297289.