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 0x273c7da7fe3ff0db86a9c0fa7d28de1fcfb59326b761e6119dbf831572fbb973. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3025340-a4e1-4670-a219-44670d898346.json and https://artists.proofprofile.net/proofs/artist/d3025340-a4e1-4670-a219-44670d898346.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 0xdeb28e30420236113d60b4789b217498d4564d6e9086e75b2d7e249614b4aa2f. 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/TCADQ1875818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac9639347560294204046a9ce3ab9efaca3d9cfb8327f2b65a1abab4413283d. 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/TCADQ1875832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc14c66a7e42249b3346d35c8f359a8bc3e3efdcbc438656fe27158ab2265001. 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/TCADQ1875835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2e95a98b7933d0ca9af58a15e4cbcddad8d982f68d3c5fe64a95aba5dc9ebd. 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/TCADQ1875836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc290a0f03b43cdac25bf0f35e90f8dbcfbeea149c57744508a63863c18a1ca6c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/TCADQ1875841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2200426f8800fba5b639e38fcbe91d80aa84d054caf58e7ab4c730a54e79e256. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCADQ1875842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07547e5d81b9a2edc9a342591ebb4cce7cc5c9810b7e125ed3dded71e9246832. 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/TCADQ1875843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b58add69dc9814ef35d636982806ddd90a08452f6b16c5775bb8326ec6b984. 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/TCAEJ1929756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7a49ca9edb8a7a10e4bb67e6940f36255fc27edab0d87d2614abc327821643. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/TCAFD2060016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fa82dee16550efbf90b66bbcab6f95d7c98df6cdd5513226ac27c48678a25d. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/TCAFN2138985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c964cca2e93a624e75cc54c6c1e6990751279f07ae92b4b18b32ab9a541058. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/TCAFU2176078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb5d1a52cf87fbf7a164f90684cd44330e623bf7a5b26e2ecfad1d01f2d8270. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAGG2272993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a41ec2226d2f097e42d734ee47b70625cb92cc0c969cdd054e9165e6ae43f2e. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/TCAGS2375961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173f9a612dc7321e46c521c6c18b184031f27e26510ea51263f4676dd22d4315. 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/TCAHJ2302733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8bdb0ceff02fd7fc75938e6c62f5e5740c42201c0643670181c7204119b29e. 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/TCAIO2445761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab344940ff44d5db635454db232daf84f0361c7af56861c2c7a624b0ca3093d. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/TCAJX2541158.