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 0x9c7cce7a3c367141a152d9f8caea4df53855ee99084fb92c6e9d483e036693a2. 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/18254949-7fc1-4fe3-a86d-8bd2c3a4d578.json and https://artists.proofprofile.net/proofs/artist/18254949-7fc1-4fe3-a86d-8bd2c3a4d578.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 0x5746514a19054c104e4378c8e256ea95ff10e360d8a41d0b238afbc3116b5046. 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/QZGWW2091043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fc04a51a93c1ec3782ea64dcdb78dd7a2ff171981f9cfd7dab0968b67d465c. 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/QZGWW2014955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13351e0c8084b4e9693baecd129bc98b232ebe9cd9398ae38f79cfa2778439b9. 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/QZ22B2053011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1677c8ed4f7ca9459fb5788595f9cc177f7d597bb6689cdf98b82eecbd4ef78a. 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/QZ22B1912655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4637ca870b75c3c4ad36110705c21ae8219d5da8c0e16d8a53d160800b65912f. 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/SE62M2239152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745f8597da068d9ce69a96c55c101fb81877e7d230415c93853270bf791c3f5e. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/CACWV2239394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3c0d6aecd51d31a9169434ab56c1f6954812144f71327337fd89b05a0982e8. 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/QZPJ32139157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7add9de685e5021ee55197edad4dee8ddc169cf8a3ba0f98e9e05bfb284f2406. 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/QZPJ32133012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0074eb7145369cf376ba0920495ce95642ac20edf79fd4c5693002fa5854812a. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZGWX2038256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b3600d4eb5029fdeffafe74231ed750780d5e3131e6aaae2c0a3b915b8c37c. 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/QZGWX2013642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6472a2e54cff022d03fae46360f0e923754a4d92d43297990fb2d6e8b03115aa. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CAENV2013324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358984c0a13fda8bbe066b9cc6c89c3e8b8c4cec09b2d5d9b8e69661ce969807. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/CACWV2074525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb946f2738b2a743a6069cbe71e7a1ed77000184ec23d7a2ec14be4c77f5a58bf. 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/CALVP2050954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdc44add9bc3c2ecfe8f106d20fb2ad579b01c7f79cd39b1f411d58fb8b7e11. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZGWW2018805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0626d56adbe87808f3e1ba13cb319fe56c74ba2492ece75d92a27c445b3411c7. 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/QZGWW2004636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6ba568bcd36ac6ead00b45fd0daf9af09631da6c9bccd7566a1153d9c40c34. 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/QZGWW1945101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f2e81a1a297df34b56fef72a43a1da4739b5b494c271b5605e433d9918a577. 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/CAENV1993709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6dc93c33a646739db0b9a1a08554fd94ad0de46a49242c24efd24e094ecbad. 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/QZ22B2079396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea7c66c6f9f861b4241287ff8899aec2c884ca5800e2a811e25aeab7a57548e. 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/QZ22B2040748.