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 0x5260ab48ac6916a7e6fd807e3880d27f0ab7a1616466a15f1c1ac4fde2661ac0. 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/b5f0aefb-cbb2-43d2-bc0f-20663286e1c0.json and https://artists.proofprofile.net/proofs/artist/b5f0aefb-cbb2-43d2-bc0f-20663286e1c0.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 0x9fa7721e689ba9a5139f98107a2aa252e1061dcb8d2fc3193c8368119091aabf. 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/QZTBA2287648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5ffb5705b0ef461230070253e955b0de9ee09a2f726b9fa73d948453ea1fa0. 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/QZTBA2287649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2589883cae410c3e16a28c401f21cb423dd5e561d068c7d2f559b3fc52d9b81. 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/QZTBA2287650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8fff6524cbb7af9543cf3f597d68c1d4896ea66243a51e9e6feaa48c4fa420. 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/QZTBA2287651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705ae0a7651df4117ba907751ec6f1495149b653952f04380fbfcf59abe085c6. 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/QZTBA2287652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27bcc0d7522ef0730303e97ef2dc410f75e536de8d1492218f7557038e4b235. 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/QZDA82273994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae95650735d9e2de5cdf5e771b26159822a6232b75f3159d9ff8bd27108279db. 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/QZTBA2354100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ba1575dd52a44ba9da6b14de2a4e456de4e7c7f32c0f53f4a721cd183da639. 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/QZK6J2295899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97dad648b3dbcf9ed138da08b0a8f5284181de70a15b4b0691b590d885a14c1d. 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/QZHNB2100995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c01ec71c2932e2d4d786a73050d804c3789a60434587d128442d7a8c22b16a9. 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/QZHNB2100996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1597d5600961a79ab74b16c4d598b39523c1c2c60df0eaf9851d5b82dbbeb183. 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/QZHNB2100998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ef17312efc63003453c3c8c04697f98c1a7b07588a23b415480c2be90a489a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:31:43Z), 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/QZHNB2100999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8fe5e7d85940ee005db93b5c6160b2995959f592abb19c1068d90644299309. 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/QZK6K2002015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabba2cbc01dbd4f46b1a27be0fbb6798ca722e21bc85e08548e43bb1d048f555. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:18:52Z), 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/QZHN42083423.