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 0x7cbcb083cdb2582d9d87d318e6e9bc41f71b630ee1d4197a1b0851edbfb75b0d. 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/4c92d0f1-c65c-42ef-8f59-170fe02814d8.json and https://artists.proofprofile.net/proofs/artist/4c92d0f1-c65c-42ef-8f59-170fe02814d8.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 0x22e7fdb0cb5893e75b80046abc879259290063b92bf8c51e3492ea45104fae2d. 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/SE5BU2232299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9fbec6944cc3d4fb7916e142612a576de070908b4fb12f3cb8368809a90e4a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/SE5752206276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ba65d100e489b45be95215ef76143b85d0de7cc86cbeeb1ac6a0d46baa3813. 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/SE5752230540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dfd37d745852045bb172f622d365190941b629d6e7148e3cf41bff3091ce82. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/SE5752261251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e2121a5ba33a062ee4a10a5efdd33621854f3cd06a8c358bfff30dbf3c807f. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SE6HN2230994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ea4c8245397b4c26e7af7db41337d557b2463cd6dd290820c9e273e1b6227b. 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/SE6HN2255746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47592dbbcf7255e20289160f565a7c4b2f0b1c700453a0667540160e46b5fd3b. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/SE6HN2255770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee6bd8aefff0d63abeb9c6fa72505a9390d85ad6bbc279cca4b5186d7abd00e. 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/SE6I32202022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb0115906d7bc418dc938c6f6b50d57121589b1c589295b8ba8f36b29d74564. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US66W2201262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84e44c60b7e8aa7a8d9b067fd0f2d6a5e21dd2a63e79f63b021e3d4d4952a90. 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/US66W2201383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d15d5c6c2814b7d245d6479893b6341e63bbf739a56ae918552995797858ec. 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/US66W2201548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe595f8ddcfb23f759901f7c80a44ae7b67b0db68394d8ced13dbfbeb47447338. 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/US66W2201771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbc450a98f4c1cae18466bf1faa3ca9d854ad06244b57938f5997ab997fac1b. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/US66W2300327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb215739bccb986d0dbd7f7857da5c22bfa7b0b7b6c0881d99fa6fc63d5fe18a7. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/US66W2300526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e023f896beb993c171104aa607cd4384da093e202c7a626dc964d518ff202e8. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/US66W2400837.