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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 0xba3580abe46cfe3a82d7c2c9f52452765fd901af3f945ff88fc1a505d1616b51. 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/bb979baf-d2d7-44d9-898b-8d46d2a35e2d.json and https://artists.proofprofile.net/proofs/artist/bb979baf-d2d7-44d9-898b-8d46d2a35e2d.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 0x4efdd96af85e5a10bfcac1259acc1d42b81af07dc321ff220efda6982ef00f3f. 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/QZNWT2096066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c1538ab95bd50db841a8ce5e2e842891d956eb15428be6b10e42a35c96230a. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWT2096067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98be36d368bf7321701ab60ebc82bb25fef8dce699eec5beb5528a3babffd4aa. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNWT2096074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b3b55b7c440ad02d450fc7bd67a45d95fab0ec7557194fe600e62f2f9f8c17. 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/QZNWX2104035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaeb9f2d5248892e5aa1cdc5f41bc41fe912ecf3a2a3bc3cd6f8b422681e77d9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWX2104039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6e9379bd0f2b2d61a71aa2090271a728e083e3c29ec59b2f69a1cffc613742. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWX2104040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d10897bf4202f69bba956e112d8b7ebd45589d3247c42dba63cc4f716046abf. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZNWX2104046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef4c014efe1e52a4301f5a8a7ed12a6176093da69db91b102c872af4273cffc. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZDA72287405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe321f4cd096c2ba2b8c470cb04ce7c1e963cee4f1e3f18e43480277e4962af78. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNWW2216161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81833c247be21b6b6d2dd92be60fc39a60a142734673a859093696793fa8994c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNWW2216166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe86d70b2c1a427161aeec3bf2d6fd023a3ac8b2d7e1fb311138cb3214ae5511. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZNWW2216167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3002eee0532865c121a6a1ac80188ba27ada767d145a48d5f91c15a19ea6090c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNWW2216169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778c48228bee6c86054d7851d74026fa79c42e71d011c1e75dc485c6a19541b3. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZFZ22405869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d62feb7d075ca02bd050b6aea89725f488908bbc4dd2b524e3af4aca048b907. 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/QZFZ22405871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ca8692d070aaf150b7ac6c20e07767418802d3204260b7c4fe2ecf9cdfec08. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZFZ22405872.