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 0x02c8ed32f5befce02f025fbea4bc2328d4b45d548a90fcd2fbe6124629acee91. 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/7b84f2a1-815d-490f-bbe0-88ad7a167136.json and https://artists.proofprofile.net/proofs/artist/7b84f2a1-815d-490f-bbe0-88ad7a167136.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 0xdfd2c3a196afd8abfadb41442d327753034f77aa9425659bbf2f4b47df846e0c. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZQAY2376750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812a4a11ff9ca576444228854fd147b2ddbfe988e2c8dfc2389e9e85aeb1ecf6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZQAY2369541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf975e887cd0ad31d99a27d3088443c4f48cf2241d27f6ab1608f8d521d812c4f. 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/QZS7J2377084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d581c3cdb118fbc10a7eaaddb1d35d5865b66b796b5affe3d9e253f83f7ba67. 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/QZS7J2340868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0242937ab045692c4b6666d325e265174ca60c65307e2fbe300587c1618cccf7. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZS7J2308864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6da459ab4e87da9c40135125e588241a8f59d147d4a46accbd1ebfa4835810. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZSYP2393482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42a412e8c8778d3e703f858d0a96bee7c7697d23bc00842b01ea82fe4baca3f. 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/QZQAY2486720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92245441f42915d4fea2730e1ff110498037a2ce2112988d15214cbeba2a9c3a. 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/QZTLA2490660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162281df7a6ec812cd2e9be5efac1ad965abd71ce16932da564b0dafa30235a7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTLA2429913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fe58afdedbb7af8aab70f355eb6dca68ca5f44d5313980e8b64f25b3bd15d5. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZQAY2418817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf16b7e11a7d7ebbccaad7f2bf1d11a6c320305c819b5b084d9d197e3a653844. 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/QZS7J2406015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bdcd034d86923db68cd688ef742d5bda30dd44c40c1a3e96877535dfdf46b4. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZS7J2465192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5402d9d02d95ec672d04db94354376806be0ec14a66db7b95df33b242e78df4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBGHZ2500729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c739552b7cbfbff422591a5919b8c8cb8dec5d9ba9f89136d39bc1197d396c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLRD52350352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9828856eda8954de29e28b464d77b283020df1531d3c101fe9406e65426cd701. 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/USAT22410608.