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 0x3a3e1d2333485dfeb8824133bfea3f4ff21d025a9d004b8c04bf9931f92aa825. 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/a5012b51-3473-441d-a129-79f958ced1e6.json and https://artists.proofprofile.net/proofs/artist/a5012b51-3473-441d-a129-79f958ced1e6.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 0x0964b4a6fd826baa9a39235e96eb5108d3845f88635b51bf4a94e7aba18b720e. 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/US7VG2463555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1401827cd1c526036a8cc1a89a2fc2638de700be68012d7e338be6a6a3e770b5. 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/QZNJW2435106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3e17ac216c0bd642bebb1ab901ade8251db87f5a14e64b368cef69679fbdd1. 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/BCA2A2300183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c1bef8660aefbcfd879e6d8fb17dd827398e269dcf74500468f1778d2bcf99. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXIV82425479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed22c09670e7a3ccfde32489af57b86752c4c38336c70e9eb81a7e05de5f227. 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/BXIV82343068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28fb219d5530c367926e3b762edc545634bf15f36cc107e3db8a81b7eead073. 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/QZHN72464576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539a539f4b6ab3dc7eda1b684fea96d05ece8058db01e232527916ca1a61c411. 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/BKCMX2300084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932a339905b7ba90351a3362a3f2f38c6d5df2ee3556405c7eb67a7ab936d798. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKCMX2300077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f7370048996ae63ed427daeafb669b1ac70ac6063140c2dd759c64f8a2f79d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG2475423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7e68680b04a4162e52f6f6bff81b71c56198a823579910e9d1b855a6a4c315. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFYZ2207107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2d300a3ad58a6bdcf28a688c4545c374e13af0ff440ddbc3a77ff4b1bbbb2b. 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/QZW9M2452252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315b54206a787fb7e7edc9b31763048b145f55f526e79fb9cb7a841fc87db8dd. 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/BKCMX2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859374a015d8f725ab8b7a70ed650b422f91fa67cf85a0dd8217ed8451f7065d. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZGLM2569560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaaa46b16a2470c8722c8aa8eb36288adb4999a9de0bff45a4393259aa3a4fa9. 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/QZGLM2569567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8eabc617ea6a6fceb3cb30acef0b03fc02fe99f00b7488faa2495a934e4aaf. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZW9L2407781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5557f4abdfbda9a08d968d01117a8ae6a0e1ec801ab9152bb85387f999acfc. 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/USLZJ2558284.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde02db69a3af387f29b46411b30946482a3f5c976fae458c2c2481c6f2bdf201. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/QZNJX2437438.