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 0x7e13dbdfa431859769b6cfcd1d920cd54cf20562b1b356c0bc92d55144b74c43. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e90c334f-cdd8-4487-8d7b-ed6931766d8d.json and https://artists.proofprofile.net/proofs/artist/e90c334f-cdd8-4487-8d7b-ed6931766d8d.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 0x2f5e9dd895a07f17c1ad00ab29945fca602458f3bf1a340aef130623c1f340f5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZNMV2440994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90eda98f18bfe4ef1cadc4ca4ec0cb7f6dfa62320f68e1307e2b65f2591f2bf2. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZMWW2403445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75061da557121062ff82491bee3f4e6e3bbf33b6bd05546168514de5028c5af9. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZJG52455997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f61cfe8e230e53e031ee60aec4791dbc4722c39b00d08f3a48b4e5f4a8c21c. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZJG52402453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0ad61c2919d1bf3157adac8ab752ceaaf00a73f15cfe6e6b6ef2aca1878696. 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/QZNMZ2362515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed82bcfab1e1c4e369d7b2f84f49fb26ba403d722c5f633e79b9b456d8488203. 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/QZNMY2374611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65abddf80fe6a6cf25eb3f4639970d421a94568de1179d33368f06ce2421b803. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZNMX2335168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676d5b64cc68286b63bc1934ed54acc5a55e00bd168244171d447860e618dad4. 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/QZNMV2324899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ce4312b5a00860e247a612fe34814dbd5f379c7b39857aee48cdbfe443321a. 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/QZNMU2319412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2899246896fe144785fb4218fc94b56219472c1f244bbba25eb5ac8a4c456dd1. 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/QZNB82307726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04728044387fd3d78e727a4badbfbcc69acae0ecf2d06a861c022c5d88d0bab. 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/QZMWW2365101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c12526c395c9df9202be4a9f42c6858843e9f302f8be79d73bd3b9a4c3c118. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZMEV2386338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7e804ff90d35a9793f3b1a7bbe9bea3307ca78c04b8170cde72e542e7bf7f0. 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/QZMWW2314996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e6251133aa0c0fd0b1df8ac3dd3638663c17600c083750c87724f5cd2f2506. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZMWW2314997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434b4cd1004823c8d278756fc196be6470f8f2d735b40b48fb273b0b9d4dabd3. 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/QZLL92351522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004aebf3f9b2047a94a173a9e7e42189d6f551c3d14ecfc2eb479cc864a30b09. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZL382397126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a89de44f2b2d89141b6d1b74640dfdee149884ba65880c33b4ca9f1d182e708. 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/QZLL92301934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee919b0cb63cddaaf5c150ce88967eeca6a7edbd0e281e253bffedb37c1767bf. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZL382397104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc702892a04c6e605441a221ea5bf43ed7166cdf43fb97d99f1358336766c60e0. 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/QZL382373260.