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 0xe3049ae409106c30b77b5254a84d90e1ef63ff540aeb5ed63c720594f0fd1e38. 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/345a0271-8054-4192-88fb-5d9ca89140d8.json and https://artists.proofprofile.net/proofs/artist/345a0271-8054-4192-88fb-5d9ca89140d8.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 0x6df5e63edbf84feb3c0fcd45f4e5df826a73889e34955f48672d7fd838e17e90. 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/USUM71914551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54771da2e2b8f10dedb1fdf7a22390cb48abb89c4fd68af743d5afabb130c615. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDA82137670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54771da2e2b8f10dedb1fdf7a22390cb48abb89c4fd68af743d5afabb130c615. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZDA82137670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33ec8c0346148cc166665df1d3227826888942b55dedb2247602c2e41191f49. 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/QZNWS2165372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1879492bac4577158e1a89d9386321567b9c8cb17091855faafce97a88c66196. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFYZ2243400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bd72715f06249fcf67cb11623dc1bb76bc234be12b12bd508ffc6ce0568ad6. 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/QZK6P2291810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497a990042922c376858a475f988291519c21fcfe154f75c1f405d3f649d8a17. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZMEQ2242600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3dc57dbbe9aa7c5e00d16c9a12e87f64cd2f09ba4aca040f368f9d95771ee9. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZPLR2291682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3dc57dbbe9aa7c5e00d16c9a12e87f64cd2f09ba4aca040f368f9d95771ee9. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZPLR2291682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea7c957ec1c7fc15a8a35ed961cd04253a02ad6037a49f8e78239f0d5b36aea. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES82345268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea7c957ec1c7fc15a8a35ed961cd04253a02ad6037a49f8e78239f0d5b36aea. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZES82345268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc17db6e3895e100ffc7caa97aaa30a5e5bfce03c542bfadbaf47d3e47ddde4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6N2361234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc17db6e3895e100ffc7caa97aaa30a5e5bfce03c542bfadbaf47d3e47ddde4. 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/QZK6N2361234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1b58877e874d04771f79c039dce508f42a480200c8771ff52424a6baf077c7. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTBC2352047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373b9aecbeb5b5c7a29eae4ed518609e721ea001dc8325aa1ccef70b61ce1ecc. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDA72093543.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bee1b972a48c1b00afb98d6c93f1ce4c02a251e74288c620a33e35b15e22377. 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/USRC11901675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bee1b972a48c1b00afb98d6c93f1ce4c02a251e74288c620a33e35b15e22377. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USRC11901675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096a1be627fe949ef4568d6a5a6092cec60c22ec19a7d505b116f1646550582d. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZK6P2240641.