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 0x45fb1a31bfd5115d22b768e911dd0e317b749e455230d2dca7f233c57ef03f51. 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/80622d8a-ded9-4a55-a240-6e1a596f97e0.json and https://artists.proofprofile.net/proofs/artist/80622d8a-ded9-4a55-a240-6e1a596f97e0.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 0xc2560565f857bb61ba4ea253588fac8cb7f9b3c6ecedc9f6eaa645f601957e10. 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/QZHN81909993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f87d7faa1345dbe1fa1e67e36a34640eb02870188312c676b0ea6c1cc2fca6. 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/QZFZ72007075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa32ca3a988bf0b12b96b7c7634c88ccbd1cd55e979b740e3f267f220f0fc19. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZQAY2132246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3839ec6edb9baf815009bfdf29661da7957c8b79a6a298d1cd133158e1eb53. 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/QZTB52258873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecccc84b59af74d9bb8548a102f9226db88f5ab4907c415f59f4bbd06e93af42. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYX2339948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd4d3ad9679843e4736a9cc1b19b8b25e7596c1214d2bb4bf01d77d7b70d0a5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA62321457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae78e028f29219d46b840e628509a1bad0803304913ca71ddc020e86fb74bc0. 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/QZHNB2337062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e01a4de3d494f97fb46bf01bbbdd03b479ad4c442447044b50b9bfae56e8826. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZPLS2373533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971b564edf86154ce86b25c49d18d9b68c1a38aa348736d20836cb5275d6808b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:01:07Z), 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/QZTAY2375731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c054ad789f42d1f8f495c0c39eb8eb192864447230aa0aecbde11fd98ba2a5b. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZWFR2373529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a07e0dafd3ef074b78ad2b59316f0590ea57eaa93f9bff77cb7d50bd043df34. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZWFR2373535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c07bea37df53d1740840c22e5407ad051e72e1368615fac7acbec28584f703. 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/QZHN42431300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b6d67e127cfcb82d521c49c337576c296f3eedb71436b7c5ab6b2ad265a711. 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/QZMEP2358439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7368a20ba94023aac480590c7bbd43539577d133a62c1cdc48292d2344a58a9. 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/QZTAU2181501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3637e24d6b59d3454c821fee89247a39d2c264d52b4af0a737c036aa6c67865d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:02:11Z), 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/QZWFG2455686.