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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 0x9b9f2796abc4fe5b9313be33d97011037b290778030e39a54260be1440a35a5b. 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/813d133b-16ce-4531-b942-1ea9b4a424dc.json and https://artists.proofprofile.net/proofs/artist/813d133b-16ce-4531-b942-1ea9b4a424dc.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 0x04d8151310ddee0d08ffc8acc5e22fd66b98ac8aa42af4f7da137d165aa6168c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/CZA168600242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7cc8f205c6c3758ff5585ed27f67ec6556ed5f1a50e3dc90e0283ccdc8034bc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZA168600245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114581edfad5d1f733c1a599cc77cb63cc97b435a7ca73f1606dadfcea3c4c12. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CZA168600246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887282465977dab30a59fd7bfd18c048c68ab4cc2d93d723e84e63cb3c371b15. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CZA168600249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae9d565dea5dd5a902fab4231ec47d610cd7d693df1ab99e02fcc25a1227394. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:00:14Z), 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/CZA168600250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb2e8847eb6663e860fda2954f31dae12ff7580c72f9ac9f3350051de09415e. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/CZA168767998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9911048d46a938531288b567f3d03288d293a9434df7e4e12dce8b430703557c. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CZA168779998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffebb43ed572787794d551aa0a779a91fdf8090b1b15d9641c1d5bc5de1ac287. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CZA168743998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795ffeebd1ab5a663459ef3b2cf010f99e4b25ac6f198742e717c0f93faf8188. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T10:16:33Z), 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/CZA168766998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101d7fdfcd913ed96371a991dbcea7a2fc983dc28cc510625419caaa047da635. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CZA160405745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb7a11ed2c4be6e4d51c7872769a6d0c02d8b44c601d2bfa0646a811093154b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZA549933103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007ed2a02a4565078625a813bbb26e9c0d029aa01cc75296db52ed9e7d08f021. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/CZA549933105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58b5c2dc9cb501c742a192d89b18c459800b2865566f9fc27d941d8716b80ec. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CZA549933109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7cce1af2e84c12cd51c2b569ba97bcfd7d188700caa72bd517fbaa4908135be. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:11:27Z), 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/CZA549933111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bc26f15f5fae9b455e5190416fd2b009d346e4b05605cab877f97d2e031f57. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/CZA549933112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c602c007c56198a6b834a1cf387f455df7271d98023904c95afe6cd725152b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CZA549933114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee2cc9252113b88192108c65b1250df3135f804669b4b9c98f1b730d0bae519. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CZI362000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44e98884b2a3dda029d029a1adbfcb83295d7192ff7f8664e1b0409357a89d3. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CZJ421500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6b25d6562ed7d3b5b60190c31e9451a9c2cc52dbe7c3239a8426008fac9eeb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:58:02Z), 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/CZJ421600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc435241e3d03a0fec5eb53c5c9eb7212c225ff25a942e43d81dd69b41a1ab15d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CZJ421600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1709f43af9057e19b1f402fafd4dd8daf5f1b20676b05c5376f98c2fbac8af56. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CZA163349740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc406cf8487ba7262046a780fe7b313760272411dd65c925c2e88c46e7ec17ebe. 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/CZA168361997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2600178a4ebd5aacbe15a761ae034090694dfe2a284a50f4a2418b2c10e5fdb. 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/CZA168535996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ffabc392b1f70b2e5120377e8ee1742b79e4bf344aeb9c635afc7aad4c7e7b. 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/CZA168788998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4186a926c990a16174183ffbe4a4e8e8892d9c9562330599d3117852a703d7. 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/CZA161502111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3195b930ef099cbb10d9ec177de313a7a2ca6350026280d873922977d86b59df. 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/CZA161502112.