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 0x9f6d3564e8db3e1072e6b0a6602ea0bb4aa341d7f38932bdf5be0c2d62f36730. 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/5dad0e23-5240-431c-9129-671240c30e1f.json and https://artists.proofprofile.net/proofs/artist/5dad0e23-5240-431c-9129-671240c30e1f.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 0x481e3ba82e51f5aa2768d2568cb28ade18b50d27702d40797d3c771e4688b1ed. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES61966918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf79cb3302dc4906c721d1978300b28a6e869f0b43f75ecd1fd934498f1857f8. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZDA41819484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d6471d55fa602757e6ff82a055f83d4f3bdda8ad04f723ade3ddd352c13199. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZDA41819485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f36a37902f0f04ff2af8c497ff90528b165f23a7ed46e10d6c060416978bb9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA41819487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f593eb05e8f858f71f3f2c0b7b01471db78b0d5fe1770b6653f25863304df3e. 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/QZDA41819489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c71e6f76311138f9eebcb120475bd4e09f96bb1c1c38944edd4c23c0694bf8a. 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/QZES71807944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012e123dc1b6639796b3b414a951a9870ab9f2620ba94a0a370c3a14ee83d830. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZES61963715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4202d93f8c483ca63912cc0949f6d059ec6da6ddf615c35ca0f459bc706b8b55. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZES61963716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee6ad73b21634fe3531edd9af2014cba1a670e4d0d15ded882d5dbe3059a83a. 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/QZES91924432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0715f4cb3b70e356c819da2151610abed52292e2de83c93f8f615e39b4ef27c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFZ71929158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a4e0535b94d30ca5ca23fd0def55be73d975eb0f1325c996fccbb196b6f6fd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN91988073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c3ad94c736d359fb0f57f105adef73738d3d88f6a5dbd51ab5f41f221746a3. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZFYX2103657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae49d4225f07c058fc5fee059f0de525093b131c7420401e1909113c9f210311. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZFYX2103658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d3d02b8e90a39fcdb08a024728bb60baafab92728125b71d588c26bbdb4fe7. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZFYX2103665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15324f52b88e9deca991fb0365828ade05e9975688d9820fc9da85e7d672a00. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAHQ2398342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2663aade7f8580d2842fefe2f005b6d872f8edf110113e4bb40f38f1b31dc2b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAHQ2398255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7402dc9a281895d1bfb070054b595033e574325f1f4ad876b397b84c8e6de54a. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/TCAHQ2398243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24af0b63018ed0ef64ad6aa7decac5d5132bd08f590489c9fa3a3300abd5f451. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAHQ2398310.