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 0x97329a3fe28b951edbc748dd1d145ebcadded37b459ab0531325916dc1893a63. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c08e27b9-234a-4c42-8981-c2b8bd1380da.json and https://artists.proofprofile.net/proofs/artist/c08e27b9-234a-4c42-8981-c2b8bd1380da.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 0xe55a977b96b0555f2fd0638d74a1aff6934e92b1d377b6bd5a4fe74366af71a7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ESA011860186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a5ad5e2b40b8dcfd097394c452cf15daa3d16a2f66c0af1bbbc347a9de27e9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ESA011784939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb131480b1899e717aad1660b18f13a57dc8793a0fb853ee94a5c8e7a7ce624e. 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/ESA012169003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2338e6ba228b485774f165aabc62aa393e8042d853b6d37994865c4491f087d1. 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/ESA012183606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ce6bda3dd4e5555a30b13a42e6c5cbcb40bf83fa67ef693f389d7587134721. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ESA011564758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ad3d31ca57cc72d784507c302b5455c811a577bf577289487f36cb7d70e2d2. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USWL12200480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a79e26e52990a0098a527195311e1f4be4758eb1508947322510fd7be829e6d. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USWL12300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d969e11cf479eef633c4b419b5faae845cee346fca970f124b04fab080c3b2. 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/USWL12301089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600f91c2ee6eef778f766683b5140278d8debed18bc4f2db60839dc4f505526e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USWL12301935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b01b8617d0386435291739c55af2b728d46ca4103341387cc52e5f1c05c8002. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USWL12302784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9411e8ec6851b821e8662869948dd5935c128b96a7ba56f9ec29fa2a2e8be4c4. 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/USWL12303327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf349042116982f674d61e07b4fc7103a5cf96003f4248ca23f4f1b99acf7369c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USWL12402099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32f689ace86b3db1d6618df63ecb8e44c0b4a298c5dbba0a6b416d32f343eb9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJV2522500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93440c552b2fbb7f6986be55e900971b7028ab0fa51f6558649c15942e5766c4. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZNJW2592401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93440c552b2fbb7f6986be55e900971b7028ab0fa51f6558649c15942e5766c4. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNJW2592401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32f689ace86b3db1d6618df63ecb8e44c0b4a298c5dbba0a6b416d32f343eb9. 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/QZNJV2522500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a04bbb74ef45708b6d1093532666371517378978d84cc0abd6bcf96d1a8a4f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZMZ92500747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea212051de3106312aea3e3a282fe8824046af0426919004df1b62253b97690. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZGLM2500940.