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 0x9b9df820030a55fd50456e79bc5f8840a1c2e7c3b5dcca12e94580411e55feb1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dcb7878-0561-4bfb-8c3b-f75602232da8.json and https://artists.proofprofile.net/proofs/artist/0dcb7878-0561-4bfb-8c3b-f75602232da8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xe4c58f6f6c9ba7c367dad0e2f589a5d7aebf6a31654ac392b7a96792708d0b99. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZGLS2583703.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90a2a80d9358c25d601367a9f91ec519982f42ad3c329269db97c8efe582c7e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNJV2577643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2ef23f3869465bf49422981551ebbb8a58820da4c92cede21acf3ee85e1295. 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/QZTV32535713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c38278e6c4e42d4bac6df70b46a0bfedaee7e15aefc6e43225652c7501d12b. 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/QZGLS2579342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a5d03caed231d9e58fcca20f2c403a46cd7bb78237ec92432fe4a01a8b10a4. 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/QZTRX2528094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4092dd7d3bcf75c074d7f2120909cd3c4e3e309250a5bf5a2e838585df742879. 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/BCIH82215017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50e1d85d874946a43f0187f58d7d07e38a53d842b797acf677065c721e1cc75. 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/US7VG2564502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10b146d8e133ba4ec57e9f876f9c7b4613f3a9085af35c3465cb105eababb3b. 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/US7VG2529732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa046141ea0724dfbb00505169f26e53f74a0106ef20f9fac3e696419064a2a7d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BCIH82214316.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271fb0f08976f3285cdc849a4648cb98a4c582fd13e00bd1ecd95c3f300aa025. 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/BCIH82213787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab60bc3f723fce2c4e14497b0512242259a4887bc6b9cba0b334d96183cb622e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BCIH82213276.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2d257e00269b208ba8354d65e14a4803e99f9ce44ae30cfa4ba7f4d37f38d3. 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/BCIH82213057.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec3f8084fb86a3d34495e144c2025c6d1768a817d569f9de2446b9edd74e1e8. 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/BCIH82212411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b20ceaf759792752f60030c0ac9d7e41a756f584f51a2e9ab1c233af8a85976. 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/BCIH82212402.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dffda7cb33ee6b07abebfc1da98932e6020755de50d31cd357080ca0a4f2dd. 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/QZNJX2469943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f52199990087241f46516afe4507b1d104a2619357bdaaac083c47bbd81940a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ESA112316247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1931be7b8115434928cdad19bd386e549c7c4989fb4fff959c08af75fa7f521c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BKPI82400075.