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 0xfaaf344041318a5c1c24fe9ffbc45cdf1127e192219c381671d8a2d4e7359e54. 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/955c947f-afce-40de-8baa-a5043a02115e.json and https://artists.proofprofile.net/proofs/artist/955c947f-afce-40de-8baa-a5043a02115e.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 0xa081cfb0ba8e2a733de01a25992a283716d32f6efeb3831f8e72e12105f7e2ca. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZWFH2564579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7af3c18fc1ff4bec9bea501264e95e0c09a79ff562256e015186ff214706b9e. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZWFH2564630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c3b7860b67f6fb34c90f5c4e3aba9aab13f01011c1357ceb96324d13d22461. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/QZWFH2567428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696e894cd3d3213f4465d90ca708b2b7521859d65dfd04270437e2372bb9a608. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWFH2567431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50533d0d4fa98b6dcf410f05eca14bfb3db28a1418421265291852c5b288c93d. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWFH2567432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cc8cb65cdd1c71b721a639a126a2ba2c6b96f305604282b5c7f304c41a4db4. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFH2567442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15578fd9ab1f579468a61e6f076d038db91f6dc8cb74aef8c4d797590375356e. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZWFH2567448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24be8ddf892ad46cdc321d4b4f179ce8c9de86f800d0554140e5b38f31f3616. 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/QZWFG2527770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe74c82ffd96ba9c091860352c29f2945942fb0e7217e4bac3f1ea806a7faea. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZWFJ2596904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0ba5dcc65197e263136adef8d2ca6e12aabe16a00f4c571f1bcf95d7390dfa. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZWFL2597755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c41b6850cae252096758e7a7f8bf47273b0d11c112a241dc5825d7284e63e9. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZ5AB2439417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5dd2de78f99bf1de782354d949d94161049ccd26a33eb9e1a75eaa33573fdb3. 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/QZGLM2471117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e48b1ace52b7ec391d7b124fd38bd6933bca908411bd9b90e7f6a6703ead4e. 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/QZNJY2491833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59b8aa4948751c507452406854296e90edfb719c9f685b4d65abbe8621b0734. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFQ2570199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f0718a90301cb87ea959d86d369ceb372e12a18e2d4fb05881dbbfeab45aec. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7N2512138.