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 0x3fbeaa2525f0b365b8a4475320d7c1fb716a80ffdc26b8f9a3479e98d96dd77c. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf3b16a7-2702-4a4f-8e5d-4483b9053004.json and https://artists.proofprofile.net/proofs/artist/cf3b16a7-2702-4a4f-8e5d-4483b9053004.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 0x2b99e1cc6913337f6720c48039bd6dcb2be50f5b93cb5618bc6c6e28df0c2ae2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZFZ22394553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e7de503b0ab0d3df9a5113dc7803895aa3121931dd8ca9a28130ce157ea297. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZFZ22394554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155465c6a880714a32ef82252729fd840534627549fed995cfbdb8d256ad9ee4. 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/QZFZ22394555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2402e2dbd77f5031e66dc093ec22e423e97ccb3674acaa6ef2ab7ac64b7094. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22394556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d8add51d2fa8cb692b0f7839511c7ab8294d4601b121b4c1109502f478058a. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZFZ22394557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3a4d29fbcf739f34416bf493a40ac828b3c66e54c40517865e3cb30da4e481. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZFZ22394558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425899281720fb9e7bb56e037f0d6d69f59d9407674ef68d36acf5e60c33c98a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZNWX2278891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1390db112f9363bfa94d1d5fb91ffae92bc60573890f2de5b2816b1b53cbb43b. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZWFL2473381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc010b9f335c4b07f940668d98b9f428f1103133f61fb6405cf095ec76e0c27a1. 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/QZZ792454404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf908aab155bb41e8e6de3257438deb97ea0fac62bfa97141ba6dc19c7d59e43e. 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/QZZ792454405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf112ce2bf3569eeb2c4c1feca2ccfa69234ca60a18044b1dd2f008658994b30e. 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/QZZ792454406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f8ce1c9b5d86fb181c1fc89c237f42f283a397a369772407c6bece7dcbeab2. 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/QZZ792452816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f8ce1c9b5d86fb181c1fc89c237f42f283a397a369772407c6bece7dcbeab2. 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/QZZ792452816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1390db112f9363bfa94d1d5fb91ffae92bc60573890f2de5b2816b1b53cbb43b. 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/QZWFL2473381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397c01f344d43947acb89ad6dac05d07230a84753c4629d6f9c860ccaca85b85. 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/QZHNA2469319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425899281720fb9e7bb56e037f0d6d69f59d9407674ef68d36acf5e60c33c98a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZNWX2278891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e78e51c9e8f0bbf8daccbda98bbddbdf489638d295637b0479ea5ce2a82be5. 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/QZHN72089207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5659be9a98c72bff7fb98347fe3f76ec3802a20d72e3abb6580b252e70db4d3a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFYX2083203.