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 0x0ace23870a7b3758a59bec59575e678cede54727534f0b9b490a3085113bbe8b. 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/3a8916c2-eff6-4a05-bddc-7e50020a0174.json and https://artists.proofprofile.net/proofs/artist/3a8916c2-eff6-4a05-bddc-7e50020a0174.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 0xdb66a9880ef626eb18b8991658040bc0304e19e80139be78f35bd7732bb7935f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZDA42024783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476cc2d20f2122f755ca33629b6eb1d7718884b32923e5b2af1ac1c964580d71. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZPLR2071211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc687947def94d34fdfd9815b80fc461e3be5e2b71d307c2c87a1c356b30e6375. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/QZK6K2132118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb621797d547c9f463dd56566b4174e37d34ab63fa810d9a96e34303ff1dc3a27. 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/QZES62343775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936dd58faac5fa604d312b96c9171d979ebae8a18e4f8d3d49551069aac682de. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWX2360753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aad61ff10d217496572e0c5f8896364949742e235e4d1d991cf929cbfd050ab. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZFZ32445007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6904b714eef0fcbfe9cfaf2376a362a02aef4dd5ef6dcc8d71f45b07f95ba0d3. 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/QZRP42444779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b5f1892ab1a77b690769bf24f3ffc41323995ecbf72edc35d19fb7f9086fe3. 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/QZZ7R2431616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35efb39185bdad76f249279763624f6b2fe05b3b056b44b8f93d54afbc4c2f3e. 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/QZZ7T2463284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0227747fccc7a323bfbdb6d542265f74e0f32d30a62b5512bc2a9c22e0de315e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QT3EX2424104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae3bfa936e6f2168424ad79f1ccfc7782685e02e2412df64e45a702943e7140. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZZ7T2401314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c7ed21a394ec319caa8ec84b75d191234b90417dc345fcda7eb4d76767d5e9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZDA52537435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2998470fe640c3015b0eafa9053da0e6d4f9b635e8947c1fc3af44702ef41d0d. 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/SE6I32553527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29235f425332c5f5ce8aea3db626013c76a3327d9dcac91d9b71395a52891db8. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/SE6I32553528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555dfed0941ad330d55835678a86077922cfc82e2feda10a15060259ce647864. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QZTB72446464.