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 0x5a9e6e13ee6d623e49068c8ec68be712568d66ff3a55bc17d97064df66d1c2ee. 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/c6f79167-a476-4e65-b0af-8e380195c878.json and https://artists.proofprofile.net/proofs/artist/c6f79167-a476-4e65-b0af-8e380195c878.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 0x70fed1c65ddcd3ca44622f7bd53e1c9759d9f1fd8136bed60037ea191fa50e00. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US7VG2555636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4259737d581fd82e68fd74ad07a8634ee9e53757fddec550c54ba3e0c5b6ca0f. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/BXKG22500413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536f16b4ad9760afcb59aceaaa11e4845d0b492b0a6d0030b30905e4ee5e465f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZGLM2560752.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadacd58b7ea27c211bafaf5123ab2bed188bd34ac33c8d5ea91d8315500d8d9. 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/QZGLM2522275.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929ed89de306bd5816d9ab6c8cba2a0c04dd65621adbd5c6efbd73aac8c64ef6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ESA112561123.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5234734006f5e8bbdc37916d5593e092db7ea8274947f14837bf7ccc7cbbfc9. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZW9L2464158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c113b41d20e224a638874e387a279956a57f59974ac8178d4a32a67d7cd2cbf. 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/BC76U2400076.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18b6161521bf4cb91735ed5809d56813a74e8f6b372014647896e0e2d537609. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXIV82425171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4616ebafa094ecf33a5a7c0e1c157e69036b88917bfc0779ad40ccaa678bd037. 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/QZNJW2402886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1a4b420cbfd6a38f14ed2577c431f7ac42b14f583ecb7a829a8948551e0f43. 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/SGB502490999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7619ae0143606c5d6ffa872a1820bcde0b3aa3a3fff8590327baec4f18f93730. 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/BK2242401279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad748b7ca6362ad3a4ed553d80b39b60ea56af3fbe6e625a7488d7a54543a07. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/BXBJK2390004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df8a6ab81c57863b7053536bd3fb570182efd4c84826a43f28999183e89a797. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BKNU22400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26326f3ccc25a5753a26e26e5ee8305b501ba60888e4bd5ad8d4238aeeac5dfb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLRD52256182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe429ec8052db649eb9ca38dbb5c7bfedbf3f6aa6d6cc3692b039a554c6accc1a. 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/QZZ8A2460299.