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 0x79155c44058d7d881611a3ed4b941e9d7e4816b90ac68d1eecdc63cd18ac7ba8. 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/a6c58013-c177-45b1-8906-76998321621f.json and https://artists.proofprofile.net/proofs/artist/a6c58013-c177-45b1-8906-76998321621f.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 0x68b204787e14acd38cf89ed157183e05be043bc0f1caad0676dff35f6fa253a7. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/ATFK42201140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907bb0686e707722d397c118993563c6ebc65c7f583d9b7e990127e54144dc5b. 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/ATFK42207280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e94edc92de771737db16252652caf408b97f1dc4040f0db70de9b483421c411. 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/ATFK42208111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0796229a583539a9325cc6e657d631bfbee7a2ce8f60b669a358d6a581762d3. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/ATFK42204140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7293145c34cb73c50c6e71351aa1afd8cb771790f5e2ff3fba1c1c11d45f6d98. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/ATFK42208113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ca327b14b40ea5a2050a5c86e62eb28c4246dcb4e761d96a96207447a275ee. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/ATFK42208114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d313470198974db85c19876cc30b5504b4ae18663937e87c18aa82f670d7e4. 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/ATFK42206300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d4fb71d6561a823e0a05fbae0ef3e6076a113523fa3fd7062f830ec94cef2c. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/ATFK42207281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea3aab8086ee5fc83f00ab9fbddabcc50de799cbe7b5cf5b81e9449966f18e9. 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/ATFK42208116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381f6744e2a90632a067d22c19f48e8447ffc431ed4b1ff8a68d96cd07b4ab50. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/ATFK42208117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e39a1d413ca34e80817a2da877240894400a3b64008ad5a42c3a527056d7df. 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/ATFK42310110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9f2d5d0ef12c3ecca62a9a85d727b52247deba3ab3434852ac39b93f171e3a. 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/ATFK42310111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3eeebb9e297999dd8d25720c062c25aae9db36aa72ce8965d3d8e562c679bcb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ATFK42310112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30c1aa647613f21d140c354eeb960bfef0a1b11e5ada5ff1c0945fa1d6825a2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ATFK42310113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d6b253125103bff033f689203f8ea2e46e1a7b07e61140cb8402f57ce1e1d6. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/ATFK42403110.