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 0x4355de72fc1b404179a0540ac0777b081b22748ed994e96e76704435ec854db8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77a40f80-56d5-4051-bbac-3ea53087740e.json and https://artists.proofprofile.net/proofs/artist/77a40f80-56d5-4051-bbac-3ea53087740e.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 0x1f80d597155c6b6e385a51ad2c81a881ec2421b9a5df95d17d906e0799228dd7. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/BKH202400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de2719e0291e1411c4417c958327c018fc05a9a1fdb8d35015cbdf644b0d9e1. 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/BKH202400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5149c821267fb0518475c02d3ea9000bdfc31e40137ddac42c434aca5e505e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BKH202400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1190b4b6bb403656b74912cd259cdcb22f269a8348f12a85d7a8ff3ffa4aef6d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BKH202400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7be9b744d797595272b7385293e6a224460d10a13f0d6e9b91629def3d262a. 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/BKH202400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17c6928baf6a9f6e37654edada480a7bf3f8dc6b2a4a7a6105fc5745e6dfc92. 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/BKH202400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507238c4ed4132bff6904e1f7ef2658b0b2bc5cc6a954456b1460ec3646762ad. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BKH202400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f80d597155c6b6e385a51ad2c81a881ec2421b9a5df95d17d906e0799228dd7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BKH202400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de2719e0291e1411c4417c958327c018fc05a9a1fdb8d35015cbdf644b0d9e1. 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/BKH202400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5149c821267fb0518475c02d3ea9000bdfc31e40137ddac42c434aca5e505e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BKH202400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1190b4b6bb403656b74912cd259cdcb22f269a8348f12a85d7a8ff3ffa4aef6d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BKH202400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f46c3b5a2f312fef1648b4f557691dd5db0d149e6f62bdf557887c7ca95b17. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BKH202400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7be9b744d797595272b7385293e6a224460d10a13f0d6e9b91629def3d262a. 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/BKH202400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca5a8ab16513f773964e653d24b4a412d67dfab07dc80c524854c00fd74e560. 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/BKH202400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8990321556a9b429f3b296f6db96de7745a8083ed1ff60dd7e4a797eae972388. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BKH202400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507238c4ed4132bff6904e1f7ef2658b0b2bc5cc6a954456b1460ec3646762ad. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BKH202400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dcf876646e895e7db18904ad45118798a4ecc98041c7bbd75394e13379fa90c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BKH202400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea33ac2885c9a75b3129c4072ac32b5c9212000d7b8a5ddc0cc00278c29a225. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BKH202500002.