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 0x19bf98c82b94c4d3e40429dfc5c83a5aeb684349a89a215a8e9b00afc657b564. Chain 2 (Bitcoin): anchored in block 953795 (2026-06-15T13:44:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e10f86c2-33a6-4913-a5a8-aa4c1813299f.json and https://artists.proofprofile.net/proofs/artist/e10f86c2-33a6-4913-a5a8-aa4c1813299f.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 0xe04e2a994cee1df6f55a08eb97ae4edd5f76ac1b1d587f01adecf5e147192d86. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/TCAHY2445316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fee8432dea587b6acd0f6be341e0137c2dc962d9f1dbb8d5041920d9311688a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAHZ2406344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b3888e06876784d02e2b369c7967c3ebfcacb5a8c36741a7c2761be894bc57. 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/TCAHZ2406354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422e144e0ea3a7e8103b12bf385c00cae2c57de37bfd7f9fc313119c0f420c8a. 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/TCAHZ2406374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3140ff92ca3b052a95870778c6b4be34687a67df9b73d5800858ac09faa562. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAHZ2406383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8626cc79386cb708ba3ac35295464b712200c5c34f88885e53bb0f1c6bb9eeb0. 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/TCAHZ2491747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03eddbcb692c12b2df9881826ec98d6a894548921b7d9b09313f8e14593ba4b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAIA2434775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161135f5ca71ed5f79d89a2567ebca60f52fd0ce911ec4ea32acf8696b7654bd. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/TCAIA2462954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9e4cba04ddd2290b82c23e9acf0263ae02d690481bd4010a6a791c5eaf844d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCAIB2486682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b572179c9c72649a10bad74a9a30848a8a526a5cec10e0e4a5ae3334366ad3. 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/TCAID2407726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5043be0594531a7c1cefb9a15fd0a2d66d7dce4828c21416826857c900736994. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/TCAIE2403281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc91d8cc7ad00c3c0dccd3254d8645983e4eb63b52a4db840b9be34fe1a2781. 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/TCAIG2411391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68835cc2d68b6710171d9cdef2cbd423789edc257bcd9bd4cb25d991601aeccd. 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/TCAIH2461650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5903ae07dc1363dbb37401a0f0ea0b1cdeef5dcf214e6e52cc32699e1f440ed3. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCAIM2437913.