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 0xb92250a23ca313d107b224b06caccacd2f142b77c4b0bb0ee6a420a569e64433. 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/054859dd-c848-4114-b180-65349f4acb3a.json and https://artists.proofprofile.net/proofs/artist/054859dd-c848-4114-b180-65349f4acb3a.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 0x6e4a84ad02319fb47a76ad78104e6f139a7282a892f8d68fca6c51011c05863d. 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/QZDA82322140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb501cb64bb81169edbf1e75bee7b0c2a410509cbfc478c1ff664ef40d3db282. 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/QZWFK2367338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb40fd4beabf437453f04ffdc101e887246cf3803c89b13b9f2e8307521ca5e9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFK2367339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39817e1c39d5c5d2c3797610ddad427e179628630f664a426a4eb7f8c052fbec. 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/QZWFK2367340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e2fd66d74eccc76c5d1f79f091fcf8273b0a932eeca226624dde8250e1376b. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZWFK2367342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7660a96d3943ed818c7a6ac9dcbba15dd43c77498e467bb280f0481ec15584. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZWFK2367344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bb1315b32804bb10b0049a1591863b4d1adfe520c7fd738eb3432faeee1de0. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZFZ22403987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabeefabba9b2c6f3e4f29e5cca3a18d1d9d7093017c1111b4ef536cc4fa680b. 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/QZFYZ2419799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b75858f36b619f12bd14a7ee3cc76e7f47b297473c076e8571dce63492ab0d. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHNC2483880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47423709abcaf356b2e09f0ae3040c4fdc3bddad01f4221281f3f23da5f3fa0a. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZK6H2462809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4b434520695658f536ac95f8df73bb42f6f7021ca81426e657ed40998dc7ca. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZNWX2432442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7587f1e7642cde02f4d2de54edb4108e096ceb695ff0e4b3152d1df1870676ad. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZWFH2470432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c297acb9643cf36685f0e1b509069a996bd94710541a8f4577bc0c6b2bc840. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZWFN2461676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde07515e7df805d107e9f4abb6be687984ac132a753410d4acc4ab08c4f641ef. 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/QZZ792476244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2030523bb15838da8c08dfdcf1bd9373a402b91fb0c0d50ecf2b697cd1ccc736. 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/QZZ792476245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee37fafd7fa58f726c545bdea33e734d21f4678f13dc91f7816a6fc93423f65. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ792476246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f58e5d31262fdf7d061a531a75a76940fc003aceb0f80bf61e93db030a2227. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZZ792476247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b6ad052d58b6e7f5308e0b2ccb797fdf2b1ec413b2133124c7b4a81d8f1313. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZZ792476248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774ea6664ef2715f3edb5638323c138a558a4c8aa873d2892fb188c79209e109. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZZ792476252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10e92123bc9cc7702710ad033351a23ebb2cbc3a705fdaf40ca757b3e14c8ce. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZZ792476254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645c97b6234e695dc3b58fcd1d0bc2ca61ffd0c7e4ec3b77124ec4bc38ca8d9d. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZES62531232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd1136fa0dcb0cb01669dbd27690b30e8c60717e771d90f75caa26c5fe4b4a6. 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/QZNWU2554474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82b354a25c43b2e496f306634fe0fb9b172739a5f1476180a94c5a8dd538809. 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/QZZ7V2533369.