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 0x0e89d3d18f1485d73b57162e3b3f860a02bcc3d461e77f8c65a04fcb590c2d35. 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/309cf0a0-35c9-47d0-8daf-587653baaa52.json and https://artists.proofprofile.net/proofs/artist/309cf0a0-35c9-47d0-8daf-587653baaa52.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 0xbe926ade13f293e899ad4b136fe0f51743471d3fd7a99b4849b5565f263ec9bc. 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/QZHZ51903353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1566d5ce5a66b6b88dbdaa48135d54238352157aab4cb08f2d86824a8bf54669. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZHZ51903360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ab08305e2756e2c727e8ab16a78e5770381f1d502356fa1f3fc538ed688eef. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZGLS2046849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537d45102a3d98e29ca4b9644563dcee837481f1551644797394304163bcc4b0. 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/QZGLS2046850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6beb35ad3f44de6680f12ac3eda8391a6c8e62389357546e4886e5b47b76db. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZGLS2046851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4684fa938f4300f94079020162c85dd6a3d81d2e8a85a8d630c9048f50f6a9cb. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZGLS2046854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf69c9f84412bfd9ee85ed1e19736cab9c94a50339f6ca5fbbcb6ab8fa35d5e. 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/BCEIM2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a019756baefb668aea4b8b86f820d45fd27519a0c2c234c69b61acbb13c0e8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BCEIM2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2142226bedd1fc171bcfb40d41baa22c9b972c60be551d80253ea4f16d7f2b0. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/US7VG2391431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc907da9fb709ee24379014685e229ffefdc560d73ef24d0ce0a0a0e52fd43705. 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/US7VG2391432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7b5adbba6f1b8f2a5c9aebc721b786214427ca8faa85c1e8d00069c6132d67. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BCEIM2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3298a6fb9f390da01a7fd52d77cb42e61eed8f744622359cf38f3d78e428de. 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/QZNJZ2463858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f21425b1dc81955bf420a8d6689ec59075f45a54194cc9f01234f53e997cc6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/BKNOK2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75f200b3f827085ad1cbb0b4df30c58af28865d65b117b3fa9db347fb5932b1. 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/BCEIM2500005.